NSWP 10.0
Revision 2
July 1, 2011
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Nuclear Safe Work Practice 10.0
Electrical Safety
1.0
PURPOSE/SCOPE
This Nuclear Safe Work Practice (NSWP) provides specific information and guidance regarding
personnel safety precautions to be observed while working on or working near electrical
equipment, including batteries, switchgear, load centers, and motor control centers (MCCs).
2.0
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DEFINITIONS
Arc flash hazard – A dangerous condition associated with the release of energy caused by
an electric arc.
Arc Rating – The maximum incident energy resistance demonstrated by a material prior to
the onset of a second degree burn to the skin. Arc rating is normally expressed in cal/cm2.
On garment labels it may be called Arc Thermal Performance Value (ATPV).
De-energized – Free from any electrical connection to a source of potential difference and
from electrical charge, (e.g., not connected to a voltage source or containing residual or
stored energy).
Exposed (as applied to live parts) – capable of being inadvertently touched or approached
nearer than a safe distance by a person. It is applied to parts or components that are not
suitably guarded, isolated, or insulated.
Flash suit – A complete arc-rated FR clothing and equipment system that covers the entire
body. Includes pants, jacket and hood fitted with a face shield.
Ground Continuity Monitor (GCM) – a device that provides a visual indication that a
continuous ground is present from the GCM to the power source. A GCM is equipped with a
light (usually red) that can be seen as long as there is a continuous ground. If the light is not
visible, the equipment must be removed from service until it can be checked and repaired.
GCM’s do not stop the flow of electricity. They are only warning devices.
Ground Fault Circuit Interrupter (GFCI) – a device that is designed to sense an imbalance in
the circuit caused by current leakage to ground. If the current flow differs by more than 5
mA (+ /- 1 mA), the GFCI will open the circuit, thus interrupting the flow of electricity
instantaneously. GFCI’s provide actual employee protection and are available in the
following types: circuit-breaker, receptacle, permanently mounted, portable, and cord
connected.
Incident energy – The amount of energy impressed on a surface, a certain distance from the
source, generated during an electric arc event. Incident energy is normally expressed in
calories per square centimeter (cal/cm2).
NSWP 10.0-1
NSWP 10.0
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July 1, 2011
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Nominal voltage – the nominal voltage of a system or circuit is the value assigned to a
system or circuit of a given voltage class for the purpose of convenient designation (e.g.,
120V, 440V, 600V, 4160V, etc.) The operating voltage of the system may vary above or
below this value. Voltages are expressed in nominal values unless otherwise indicated.
Safe Work Boundary / Arc Flash Boundary – this boundary is established by electrical
workers when working on or working near exposed energized equipment > 50 volts to
protect non-electrical workers from entry, and as a means to alert others of potential hazards
that could cause injury due to shock, burns, or failure of electric equipment. For the purpose
of Switchgear, Load Centers, and Motor Control Centers, this is the greater distance of safe
work boundary or the specified arc flash boundary. All personnel entering this boundary
shall wear specified PPE shown in the Site specific FR clothing requirements per Section 4.
Example: If the safe work boundary is established at 20' versus specified 10' for a Category
"A" hazard, then Category "A" FR clothing is required at the 20' boundary.
Working Near (live parts) – any activity within reaching distance (of any body part) to an
unguarded, uninsulated energized circuit OR performed inside the "MINIMUM APPROACH
DISTANCE" (i.e., whichever distance is greater based on voltage present) that subjects an
employee to an exposed or potentially hazardous energized conductor or circuit part.
Working On (live parts) – coming in contact with live or potentially live parts with the hands,
feet, or other body parts, with tools, probes, or with test equipment, regardless of the
personal protective equipment a person is wearing.
3.0
RESPONSIBILITIES
Managers and supervisors shall be responsible for ensuring their work groups comply with the
requirements of this work practice.
• Job sponsors and vendor escorts shall ensure that contractors and vendors or visitors are
aware of and follow the requirements in this NSWP.
•
Employees who manipulate or perform work on electrical equipment and components shall
be familiar with and follow the requirements of this NSWP.
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All persons on site shall be trained to TTC036, “Electrical Safety Awareness – Nuclear”.
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The Nuclear Environment, Health & Safety Peer Group shall be responsible for maintaining
this NSWP.
4.0
PROCESS
1. This safe work practice applies to Operations, Maintenance and other personnel who
manipulate, perform, or support work activities for working on or working near electrical
equipment and components: Examples include:
• Station batteries
•
Switchgear, load centers and motor control centers
•
Other related equipment (including panel boards or switchboards with molded case or
insulated case circuit breakers, motor starters, and small power transformers)
NSWP 10.0-2
NSWP 10.0
Revision 2
July 1, 2011
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Working on miscellaneous live and/or dead electrical circuits, including equipment
grounding
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Assured electrical equipment grounding regarding use of electric tools or components
powered with flexible cords and cable, including the use of extension cords and use of
ground fault circuit interrupter (GFCI) devices.
2. Based on specific arc flash calculations performed, cabinets or components requiring arcrated flame-resistant (FR) protective clothing are identified within the Switchgear, Load
Center and Motor Control Center (MCC) section. Specific components listed within
Section 4 requiring additional protective measures are also labeled to specify the safe work
boundary / arc flash boundary and minimum rating of FR clothing required.
Note: For specific guidance regarding work activities involving electric transmission and
distribution systems, reference and follow the Duke Energy Safe Work Practices Manual,
“Electrical Safety For Transmission and Distribution”.
5.0
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6.
7.
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9.
SECTIONS
Working On or Working Near Exposed Energized Conductors and Equipment
Working On De-Energized Lines and Equipment
Plant Battery Systems
Switchgear, Load Centers, and Motor Control Centers
Switchyard
Transformer Yard Areas
Electrical Protective Equipment and Tools
Grounding
Assured Electrical Equipment Grounding (Use of Tools and Extension Cords)
Section 1.
Working On or Working Near Exposed Energized
Conductors and Equipment
1. All persons shall be trained to TTC036, “Electrical Safety Awareness – Nuclear”.
2. Only employees skilled and qualified to perform electrical work or specific job tasks are
permitted to work on or work near exposed energized electrical equipment (i.e., within
reaching distance of an exposed circuit or inside the “MINIMUM APPROACH DISTANCE”).
These employees include, but are not limited to:
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Instrumentation and Electronics Technicians
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Electricians
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Operators.
NSWP 10.0-3
NSWP 10.0
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3. All other employees (e.g., mechanics, painters, observers, etc.) shall stay a minimum of 10
feet away (or the established safe work boundary/ arc flash boundary) from exposed
energized electrical equipment unless there is a work-related need to enter an established
safe work boundary / arc flash boundary and the following conditions are met:
Note: These conditions only allow non-electrical workers to enter the established work
area. They do not allow non-electrical workers to work on or work near exposed
energized electrical equipment (i.e., within reaching distance of an exposed circuit or
inside the “MINIMUM APPROACH DISTANCE”).
•
employees must understand and be able to maintain the “MINIMUM APPROACH
DISTANCE” for voltage present
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employees must be knowledgeable of the construction and operation of the equipment
or a specific work method being performed
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employees must be dressed in appropriate PPE for potential arc flash hazards
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employees must be able to distinguish exposed live parts from other parts of electrical
lines and equipment
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employees must know or be able to determine the nominal voltage of the exposed live
parts
4. Only employees skilled and qualified to perform electrical work or specific job tasks shall open
enclosures or panels containing exposed energized electrical parts or equipment.
5. Pre-job briefings shall be held in accordance with NSD 130, Job Briefs, for any job that
involves potential electrical safety hazards.
a. The pre-job briefing is the primary opportunity for the supervisor to discuss specific
electrical hazards and contingencies. Ensure all conditions are discussed and met for
any non-electrical workers needing to enter the established safe work boundary / arc
flash boundary.
b. All questions must be answered and concerns addressed. Workers should not begin
work until they are knowledgeable of and prepared for each aspect of the work plan.
c. Ensure additional pre-job briefings are conducted if significant conditions change or if
personnel changes are made during jobs already in progress.
d. Consider and ensure rescue plans are discussed for possible contact with (or becoming
attached to) energized circuits. Elements of a rescue plan may include, but are not
limited to:
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locating nearest phone and verifying it is operable
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identifying local feeder breaker for circuit(s) being worked
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evaluating need to work in pairs, e.g., if exposed to > 600 V (nominal)
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determining if additional equipment, PPE or support may be needed.
NSWP 10.0-4
NSWP 10.0
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Note: Additional support may require notifying Security to ensure Medical Emergency
Response Team (MERT) members are aware of exposed energized work being
performed in areas difficult to access such as lower plant elevation “pen” rooms,
containment, the switchyard, or in other remote locations within the OCA (Owner
Controlled Area). For other plant areas, first aid / CPR trained MERT response
within approximately 4 minutes can be achieved.
6. Ensure that for work on exposed energized equipment > 50 volts, trained (first aid / CPR)
individuals are available to begin emergency treatment within approximately 4 minutes of an
accident.
7. For work done in remote field locations (e.g., transmission / distribution work, Emergency
Response Organization (ERO) siren maintenance) where two (2) or more employees are
working on exposed energized equipment > 50 volts, ensure at least two (2) team
members trained in first aid / CPR are available.
8. Where electrical workers working on or working near exposed energized conductors could
make contact with live parts or circuits greater than 600 V (nominal), ensure they work in
pairs.
a. The requirement for at least two electrical workers to be present if exposed to live parts
does not apply during routine switching operations unless unusual conditions prevent
this work from being performed safely.
b. The requirement for at least two electrical workers to be present does not apply during
initial emergency repairs or under crucial operating functions where overall plant
“nuclear safety” and / or the safety of the general public take precedence.
9. Employees shall consider lines and equipment as energized until they have been isolated,
checked for voltage (i.e., a zero energy check) and grounded (where applicable).
10. Verify all components prior to beginning work. Ensure you are on the correct equipment,
unit, train, etc. Refer to NSD 500, Red Tags / Configuration Control Tags, for additional
information.
11. De-energize equipment or circuits before working on or working near them, unless:
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de-energizing increases hazards
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de-energizing is unfeasible because of equipment design or operational limitations
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energized equipment or circuits operate at < 50 volts-to-ground and exposure to
electrical burns or explosion caused by electrical arcs is not increased.
12. When checking for voltage or when working on or working near exposed energized
equipment > 50 volts, until verified as de-energized, alert others of potential hazards that
could cause injury due to shock, burns, or failure of electric equipment by performing the
following:
•
For electrical exposures < 400 volts, if you or co-workers cannot adequately warn and
protect employees from electrical hazards that may be present, post appropriate safety
signs, rope, tape, plastic chain, or tags.
NSWP 10.0-5
NSWP 10.0
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For electrical exposures > 400 volts:
a. use barricades, safety cones, red danger rope, tape or plastic chain, in conjunction
with signs or tags, to establish a safe work boundary / arc flash boundary (10 ft.
minimum) and prevent or limit employee access into the work area
OR
b. if signs and barricades are not used (e.g., for short duration jobs) or when work
areas are such that signs and barricades do not provide sufficient warning and
protection from electrical hazards, an attendant (sole purpose) shall be stationed to
warn and protect exposed employees from potential electrical hazards.
13. When checking for the presence of voltage, do not use tape or insulation penetrating
methods.
14. Ensure voltage checks are considered for residual or static voltage that may be present.
15. Check voltage levels and the presence of all potential sources. If possible, use a volt-meter
or other contacting device of appropriate range; otherwise, use non-contacting voltage
testing devices.
a. When work requires direct contact with electrical circuits, voltage testing and / or
indicating devices shall be used to verify as de-energized and to determine no electrical
hazards exist.
b. Be aware that some equipment is fed (or possibly back-fed) by more than one source
(e.g., switchgear, motor operated valves, etc.) or can be actuated from more than one
location. Maintain a questioning attitude regarding isolation of electrical equipment.
c. If any unusual condition is encountered (e.g., voltage present when it should not be,
missing tag, label, etc.) immediately stop work, place in a safe condition and contact
your supervisor.
16. Verify safe work conditions before beginning work:
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initially
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at shift change (by oncoming shift)
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after other work stoppage when workers are required to sign out or re-enter a tagout
boundary (e.g., tag lift, boundary change, etc.)
17. If there is a possibility of the re-accumulation of stored energy to a hazardous level, verify
safe work conditions periodically throughout the shift until work is completed or until the
possibility of such accumulation no longer exists.
NSWP 10.0-6
NSWP 10.0
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18. Prior to use, visually inspect test instruments or equipment, and the following for external
damage. If there is any doubt as to the equipment’s integrity DO NOT USE IT!!!
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all associated test leads
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cables
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power cords
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probes
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connectors.
19. Verify that voltage testing or indicating devices are operating properly and that appropriate
settings are used for the parameter and type of voltage to be checked. Personal injuries
have occurred as a result of incorrectly set testing devices.
a. As a general rule, testing devices are not calibrated. Calibrated instrumentation is
required only when the data must be recorded.
b. Do not exceed the maximum safe voltage for the test equipment. Follow manufacturer’s
guidelines and / or group procedures for specific limitations of equipment used.
c. Verify that the testing device is being used for the correct application and in the proper
configuration. Follow the instructions in the Operator’s Manual for the specific make and
model being used.
20. Specific inspection requirements for electrical protective equipment, insulated tools and test
equipment may be referenced in Section 7, Electrical Protective Equipment and Tools.
21. Use test equipment to test the circuit elements and electrical parts of equipment to which
employees will be exposed to verify that they are de-energized. If the circuit to be tested is
> 50 volts, nominal, voltage testing equipment and / or indicating devices shall be checked
for proper operation immediately before and immediately after this test. To perform the
“Test – Check – Test” (or live–dead–live) function test:
•
VERIFY -
verify that the testing device is being used for the correct application and
in the proper configuration
•
TEST –
prior to use, consider parameter and type of voltage and test equipment
per manufacturer’s guidelines to verify proper operation
•
CHECK –
check the circuit with the voltage testing and / or indicating device to
verify zero energy
•
TEST –
following the circuit check, retest voltage testing and / or indicating device
to confirm proper operation before proceeding.
22. Exercise extreme caution when performing troubleshooting or “Investigate / Repair”
activities. Always be attentive to both the work and the conditions when working on or
working near energized conductors.
NSWP 10.0-7
NSWP 10.0
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a. Be aware of the condition of breaker cubicles before beginning work. A degraded
cubicle (i.e., evidence of physical damage, rust, etc.) could indicate damage to the
terminals inside that could cause the cubicle to be energized or the components inside
to be degraded.
b. Look at the physical condition of any exposed conductors. Stripped wires and / or
melted insulation could allow an unsuspecting worker to contact energized conductors,
which under normal conditions would not exist.
c. Perform only work in the original scope of the job. Performing work not described in
procedures or work instructions can lead to unanticipated actions and work not included
within the tagging boundaries.
23. Conductive articles of jewelry and clothing (such as watch bands, bracelets, rings, key
chains, necklaces, metalized aprons, cloth with conductive thread, metal headgear, or metal
frame glasses) shall not be worn where they present an electrical contact hazard with
exposed energized parts.
a. Jewelry and watches (rings, necklaces, bracelets, earrings, etc.) shall not be worn
when:
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checking for voltage
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installing or removing breakers from cubicles
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racking breakers in or out, or performing other switchgear, load center, and MCCrelated work activities requiring electrical PPE.
b. Remove all metal articles, jewelry and other conductive items prior to opening
protective enclosures and working near any energized circuit, including equipment,
station or vehicle batteries.
c. Take extra caution when wearing security identification badges. Restrain badges /
lanyards by tucking inside worker's clothing or PPE to prevent contacting an energized
source. The removal of metal objects from badges and/or lanyards or the removal of
badges and/or lanyards that have the potential to contact energized electrical circuits is
also acceptable.
d. Use glasses strap to restrain and prevent metal frame glasses from falling into
equipment when working near live parts where head is positioned close to exposed
energized equipment. Unless the location of the part gives sufficient horizontal or
vertical clearance, remove metal frame glasses or wear a non-conductive face shield /
safety glasses over them to prevent accidental contact.
NSWP 10.0-8
NSWP 10.0
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24. Do not approach or take any conductive object without an insulating handle closer to
exposed energized parts than the “MINIMUM APPROACH DISTANCE” shown in the table
below, unless the:
•
employee is insulated from the energized part with rubber gloves and / or sleeves
OR
•
energized part is insulated from the employee with line hose or rubber blanket, etc.
Voltage (nominal) - Phase-to-Phase
Minimum Approach Distance Phase-to-Employee
300 V and less
Avoid Contact
Over 300 V to 750 V
1 ft. 0 in.
Over 750 V to 2 kV
1 ft. 6 in.
Over 2 kV to 15 kV
2 ft. 0 in.
Over 15 kV to 37 kV
3 ft. 0 in.
Over 37 kV to 87.5 kV
3 ft. 6 in.
Over 87.5 kV to 121 kV
4 ft. 0 in.
Over 121 kV to 140 kV
4 ft. 6 in.
230 kV to 242 kV
5 ft. 3 in.
500 kV to 550 kV
11 ft. 3 in.
25. When electrical protective equipment selection depends on voltage levels, use the phase-tophase voltage on multiphase circuits. Phase-to-ground voltage can be used if one of the
following happens:
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there is no multiphase exposure
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energized conductors are covered with rubber protective equipment eliminating any
possible multiphase exposure.
NSWP 10.0-9
NSWP 10.0
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July 1, 2011
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26. When checking for voltage or when working on or working near exposed energized
conductors, wear personal protective equipment and follow work practices shown in the
following table:
These are required at the
following nominal
voltage levels:
50V –
200V
201V –
400V
401V –
600V
601V –
1000V
Over
1000V
Insulated tools
Safety glasses
Natural fiber clothing
Hard hat (See Note 2)
Required
Required
Required
See Note 3
Required
Required
Required
Required
over 300 V
Required
Required
Required
Required
Required
Required
Required
Required
See Note 1
Required
Required
Required
Electrical rubber gloves
w/ leather protectors
FR clothing (See Note 5)
See Note 4
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Face shield
Work in pairs (if exposed
to live parts)
Note 1:
Do not use insulated hand tools over 1000V. Use live-line tools rated for the
voltage where appropriate. By design, racking tools for switchgear are not
required to be insulated.
Note 2:
Wear hard hat as required in plant operating areas. Wear wide-brim hard hat for
switching operations in transformer and switchyard areas and other areas as
needed.
Note 3:
Regardless of nominal voltage level, wear hard hat as necessary to avoid
electrical contact and as needed per arc flash PPE requirements.
Note 4:
Per “MINIMUM APPROACH DISTANCE” requirements, wear gloves if contact
with exposed energized parts cannot be avoided or wear as needed per arc flash
PPE requirements.
Note 5:
For specific PPE requirements for switchgear, load center and MCC-related work
activities, see Section 4, Switchgear, Load Centers, and Motor Control Centers.
For detailed arc-rated FR (flame-resistant) clothing information, reference
Section 7, Electrical Protective Equipment and Tools.
NSWP 10.0-10
NSWP 10.0
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July 1, 2011
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27. Ensure the maximum-use voltage for rubber insulating electrical protective equipment is as
follows:
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Class 0 -- 1,000 volts
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Class 1 -- 7,500 volts
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Class 2 -- 17,000 volts
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Class 3 -- 26,500 volts
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Class 4 -- 36,000 volts.
28. Before using electrical rubber gloves, visually inspect and air-test them. Because the
fingers and the area of the palm between the thumb and forefinger receive the most abuse,
these areas should be checked with extra care.
29. Wear leather glove protectors over electrical rubber gloves at all times; do not use leather
glove protectors for any other purpose.
30. Exchange electrical rubber gloves and sleeves for dielectric testing on a 4 month cycle.
Gloves and sleeves will be stamped with a test date and an expiration date. Do not use
rubber gloves and sleeves if the current month exceeds the expiration date (month / year)
stamped on them.
31. Test electrical rubber mats or blankets on a 12 month cycle. Rubber mats or blankets will
be stamped with a test date and an expiration date. Do not use rubber mats or blankets if
the current month exceeds the expiration date (month / year) stamped on them.
32. Before using insulated tools, visually inspect them to ensure the insulating material is not
damaged.
33. For specific guidance for the inspection and use of electrical protective equipment, i.e.,
inspecting electrical rubber gloves and insulating mats, reference Section 7, Electrical
Protective Equipment and Tools.
34. Before working on energized equipment dry wet floors. If floors cannot be dried, use
electrical rubber gloves, insulating mats and a wooden foundation to elevate the mat above
the moisture.
35. When working near equipment batteries, station (plant) batteries or vehicle batteries,
avoid physical contact with exposed conductors.
a. Do not short or bridge battery terminals. Tools and other metallic objects (e.g., metal
tools, cutters, key rings, etc.) shall be kept away from the tops of uncovered batteries
and terminals.
b. Use insulated hand tools when working on plant battery systems due to risk of electrical
shock and burn from high short-circuit current.
36. When working around switchgear, load center or motor control center (MCC) cabinets,
ensure all enclosure-door retaining bolts are secured. For any retaining bolts that do not
secure properly, take appropriate action to have them repaired.
37. When exposed energized conductors exist after a breaker is removed, place or transfer a
red tag to the closed door of the compartment. If enclosure (or door) has an opening after
breaker removal, use a nonconductive covering to prevent entry.
NSWP 10.0-11
NSWP 10.0
Revision 2
July 1, 2011
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Note:
On electric transmission and distribution systems, reference the Distribution
Manual for work practices related to equal potential grounding.
38. When installing or removing grounding devices wear electrical rubber gloves with leather
protectors, eye protection, and hard hats. For circuits or equipment > 400 V, wear arcrated flame-resistant clothing. For specific guidance, reference Section 8, Grounding.
39. Sufficient access and working space shall be provided and maintained about electric
equipment to permit ready and safe operation and maintenance of such equipment.
Material may not be stored within the working space (i.e., 36 inches) of exposed energized
lines or equipment.
40. Employees may not enter spaces containing exposed energized equipment, circuits or
conductors unless illumination is sufficient for employees to perform the work safely.
41. Employees shall not reach blindly into areas that may contain exposed energized parts.
42. If needed to perform the work, use only flashlights with exposed parts made of
nonconductive material when working on or working near exposed energized circuits.
43. When working on or working near electrical equipment, use ladders with nonconductive
side rails.
44. When working from metal scaffolds, use additional protective equipment or precautions
(e.g., electrical rubber gloves, mats, blankets, sheeting, etc.)
45. Ensure extension cords (if needed to perform the work) are equipped with grounding
conductors.
46. Before using extension cords, inspect them for the following, and replace or repair
damaged cords with:
•
loose parts
•
damaged or deformed pins
•
defective or damaged insulation.
47. Elevate cords and cables passing through work areas or use protective strips (or ramps) to
guard against damage and eliminate tripping hazards.
a. If energized equipment is involved, use dry hands when plugging or unplugging
extension cords.
b. If an extension cord is wet from immersion, handle it with protective equipment if it is still
energized or if the state is unknown.
48. Before replacing bulbs or fuses in cabinets or equipment, verify that ratings and types are
correct.
49. DO NOT wash down energized transformers.
50. When manipulating breakers employees should stand to the side and turn to face away
from the breaker (if possible).
NSWP 10.0-12
NSWP 10.0
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July 1, 2011
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Section 2.
Working On De-Energized Lines and Equipment
1. Employees shall consider lines and equipment as energized until they have been isolated,
checked for voltage (i.e., a zero energy check) and grounded (where applicable).
2. Verify all components prior to beginning work. Ensure you are on the correct equipment,
unit, train, etc. Refer to NSD 500, Red Tags / Configuration Control Tags, for additional
information.
3. Before considering lines and equipment to be worked on as de-energized, ensure they are
isolated, checked for voltage (i.e., a zero energy check) and grounded (where applicable).
4. Examples of performing ZERO ENERGY VERIFICATION include, but are not limited to:
•
when work requires direct contact with electrical circuits, voltage testing and / or
indicating devices shall be used to verify as de-energized and to determine no electrical
hazard exists
•
ensure voltage checks are considered for residual or static voltage that may be present
•
ensure electrical grounds are installed as appropriate to discharge static electricity
•
observe gauges or meters as energy is removed
•
ensure that piping and component temperatures reflect system isolation for existing
conditions
•
check piping and components for vibrations and flow noise when working on isolated
portions of charged systems.
5. Performing zero energy and correct component verification requirements for certain jobs
may require specific steps or precautions. For example, cable or conductor cutting shall be
treated as an intrusive (high risk) activity if zero energy or Correct Component Verification
(CCV) requirements cannot be met.
Note: Positive verification is when a cable or conductor can be physically traced from a
point where zero energy is confirmed by an appropriate voltage testing and / or
indicating device to the point where the cable or conductor will be cut.
a. If zero energy cannot be positively verified, contact the job supervisor to determine if
work will continue. If it is decided that work will continue, cutting will be treated as
working on energized equipment, considered as MNT high risk and all PPE
requirements will apply. Reference Section 1, Working On or Working Near Exposed
Energized Conductors and Equipment.
b. Prior to cutting any cable or conductor, the cable / conductor must be positively identified
using at least two approved methods of Correct Component Verification (CCV). When
this requirement cannot be met, STOP and contact supervision.
•
Approved methods of CCV include the following:
o
o
Verification of cable / conductor tag against a controlled document (Work Order,
drawing, cable card, etc.)
Verification of cable / conductor terminations against controlled documents.
NSWP 10.0-13
NSWP 10.0
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July 1, 2011
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o
o
o
For de-terminated cables, perform zero energy check and hand trace back to
point where cable or conductor will be cut.
Physically tracing cable / conductor to a termination point identified on controlled
documents.
Other CCV methods require management approval prior to use.
6. Ensure requirements of NSD 500, Red Tags / Configuration Control Tags are being followed
to isolate hazardous energy sources, tag, block or lock energy-isolating devices, and to
ensure equipment or circuits cannot become re-energized.
•
Red tags shall be used for personnel protection.
•
White tags shall be used for configuration control.
•
When pulling fuses, sliding links, or if leads are lifted for employee safety, red tags (red
stickers) shall be used.
7. Verify safe work conditions before beginning work:
•
initially
•
at shift change (by oncoming shift)
•
after other work stoppage when workers are required to sign out or re-enter a tag out
boundary (e.g., tag lift, boundary change, etc.)
8. If there is a possibility of the re-accumulation of stored energy to a hazardous level, verify
safe work conditions periodically throughout the shift until work is completed or until the
possibility of such accumulation no longer exists.
9. Exercise extreme caution when performing troubleshooting or “Investigate / Repair”
activities. Always be attentive to both the work and the conditions when working on deenergized equipment or conductors.
a. Be aware of the condition of breaker cubicles before beginning work. A degraded
cubicle (i.e., evidence of physical damage, rust, etc.) could indicate damage to the
terminals inside that could cause the cubicle to be energized or the components inside
to be degraded.
b. Look at the physical condition of any exposed conductors. Stripped wires and / or
melted insulation could allow an unsuspecting worker to contact energized conductors,
which under normal conditions would not exist.
c. Perform only work in the original scope of the job. Performing work not described in
procedures or work instructions can lead to unanticipated actions and work not
included within the tagging boundaries.
10. If any unusual condition is encountered (e.g., voltage present when it should not be, missing
tag, label, etc.) immediately stop work, place in a safe condition, and contact your
supervisor.
NSWP 10.0-14
NSWP 10.0
Revision 2
July 1, 2011
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Section 3.
Plant Battery Systems
1. Examples of plant battery systems include, but are not limited to:
• K-1 and K-2 Batteries (Keowee) – 125 volts DC
• Backup Power (Communications Bldg. at CNS; Telephone Relay Room at ONS) – 48
volts DC to 52 volts DC
• Switchyard Power (EBH at CNS and MNS; SY-1, SY-2, SY-3 and SY-4 at ONS) – 125
volts DC
• Auxiliary Power (EPJ at CNS and MNS; U1, U2 and U3 Power Batteries - Turbine Bldg.
at ONS) – 125 volts DC to 250 volts DC
• Auxiliary Control Power (EPK at CNS and MNS; U1, U2 and U3 Control Batteries at
ONS – 125 volts DC
• Vital I and C Power (EPL at CNS and MNS; U-1, U2 and U3 Control Batteries at ONS) –
125 volts DC
• Diesel Auxiliary Power (EPQ at CNS and MNS) – 125 volts DC
• SSF Diesel Starting at CNS and MNS (EQD) – 30 volts DC
• SSF Batteries (ETM at CNS and MNS; Equipment and Generator Rooms at ONS) – 125
volts DC to 250 volts DC
Note: This section does not apply to batteries or battery charging areas for tools, vehicles
or equipment. Refer to applicable Duke Energy or Nuclear Safe Work Practices for
specific battery safety.
2. Battery rooms or areas shall be marked with appropriate warning labels or signs. Although
guards are not required over battery terminals less than 150 volts DC, employees shall refer
to signs at battery room entrances or areas for specific voltage and potential hazard.
•
Labels or signs include wording to indicate that the room or area contains an electrical
hazard due to the presence of exposed conductors or connectors.
3. Before performing battery-related tasks, ensure individuals have demonstrated appropriate
knowledge and skills. Electrical workers working on plant battery systems (including
weekly and quarterly inspections) shall be trained in the safe work practices, technical skills,
and other personnel safety requirements that pertain to their respective job assignment.
4. At a minimum, employees whose non-electrical work (e.g., materiel condition or job
observations, housekeeping, etc.) requires them to enter battery rooms or areas having
unguarded battery conductors or connection plates shall comply with the following
conditions or they shall not come within 10 feet:
NSWP 10.0-15
NSWP 10.0
Revision 2
July 1, 2011
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Note: These conditions only allow non-electrical workers to enter the established work
area. They do not allow non-electrical workers to work on or work near exposed
energized electrical equipment (i.e., within reaching distance of an exposed circuit or
inside the “MINIMUM APPROACH DISTANCE”).
•
employees must understand and be able to maintain the “MINIMUM APPROACH
DISTANCE” for voltage present
•
employees must be knowledgeable of the construction and operation of the equipment
or a specific work method being performed
•
•
employees must be dressed in appropriate PPE for potential arc flash hazards
employees must be able to distinguish exposed live parts from other parts of electrical
lines and equipment
•
employees must know or be able to determine the nominal voltage of the exposed live
parts
5. Only employees skilled and qualified to perform electrical work or specific job tasks can
work on plant battery systems.
Note: Plant batteries may contain either acids or caustics. Review the Chemical Control
label information and / or contact the site Environmental, Health & Safety (EHS)
group to ensure you are aware of the hazards associated with the batteries to be
cleaned or handled.
6. Unless exempted for specific locations, battery rooms and areas are considered plant
operating areas that require the use of personal protective equipment. In addition to
common PPE required in plant areas (i.e., hard hat and safety glasses), obtain and use
appropriate PPE for battery-related work activities.
a. Contact with electrolyte can cause skin irritation, burns or damage to clothing. General
PPE requirements may include, but are not limited to:
•
•
•
•
•
•
hard hat
eye protection (safety glasses or goggles)
appropriate footwear and / or shoe covers
chemical resistant gloves (i.e., nitrile or rubber > 6 mil)
full-face shield
full body apron (or equivalent).
b. For specific PPE requirements for battery-related tasks, use the PPE reference chart at
the end of this section.
NSWP 10.0-16
NSWP 10.0
Revision 2
July 1, 2011
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7. Before beginning actual work or “hands on” battery-related tasks, locate the nearest
emergency eyewash and shower and verify it is operational. If a permanently plumbed unit
is not in the immediate work area (accessible within 10 seconds), obtain a temporary
eyewash / drench station (e.g., from tool issue) and place it as close to the work as practical.
a. If eyewash / shower stations may not be connected to floor drains use a pail or bucket to
catch water during this check-out and empty contents into appropriate drain or container.
b. Contact Radwaste Chemistry prior to using floor drains in areas such as the Auxiliary
Building.
8. Use of the “buddy system” is recommended when performing battery-related tasks.
9. Do not smoke or create sparks, arcs, or flames in or near battery areas.
10. When performing battery maintenance, care must be taken to prevent a build-up of static
charge. For example, prior to making contact with a battery cell, discharge static electricity
by touching a grounded surface.
11. If work processes will result in the generation of sparks, arcs, and / or flames in battery
rooms or areas, follow the requirements of NSD 314, Hot Work Authorization, and contact
the site Environmental, Health & Safety (EHS) group prior to beginning work.
12. Ensure ventilation, either natural or forced, is sufficient to prevent build-up of explosive
gases in battery rooms or battery charging areas.
a. If ventilation is restricted, or known to be isolated, obtain an air monitor from tool issue to
check for explosive atmospheres in battery rooms or areas.
b. When using an air monitor, periodically check the LEL (Lower Explosive Limit) display
for an increase in reading. Higher than normal readings for CO (Carbon Monoxide) may
also indicate the presence of hydrogen (due to sensor interference), but it will usually be
below explosive levels.
c. If ventilation is known to be isolated, use the monitor to check around the door before
entering the room. If the monitor alarms, do not enter. Contact the site Environmental,
Health & Safety (EHS) group for additional guidance.
d. If the monitor alarms while in the room or area, exit immediately and contact the site
Environmental, Health & Safety (EHS) group.
13. Keep battery rooms or areas free of debris and combustibles, which create fire or explosion
hazards (e.g., dust, dirt, rags, packing material, etc.)
14. To prevent shock, avoid physical contact with exposed conductors on batteries.
15. Before working on or working near plant battery systems, remove all jewelry (and
watches).
NSWP 10.0-17
NSWP 10.0
Revision 2
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16. Do not short or bridge battery terminals. Tools and other metallic objects (e.g., metal tools,
cutters, key rings, etc.) shall be kept away from the tops of uncovered batteries and
terminals.
17. Use insulated hand tools when working on plant battery systems due to risk of electrical
shock and burn from high short-circuit current.
18. Do not remove vent plugs from cells, unless specific maintenance work is being performed.
Immediately reinstall vent plugs after work is completed to prevent intrusion of foreign
material, (i.e., dust, dirt, debris).
19. Electrolyte (acid, base, and distilled or demineralized water) for battery cells shall be mixed
in a well-ventilated room or area. Acid or base shall be poured gradually, while stirring, into
the water.
a. Water shall never be poured into concentrated (greater than 75%) acid solutions.
Adding a small amount of water into a battery currently in use is considered an
acceptable practice.
b. Electrolyte shall never be placed in metal containers and / or stirred with metal objects.
20. If your eyes or skin are splashed with electrolyte, wash the affected area immediately.
Contact MERT as soon as possible, extension 4911.
21. When charging, repairing, or servicing storage batteries, refer to manufacturer safety
recommendations where work order and / or procedure guidance may not exist.
Receipt, Storage, and Disposal of Plant Batteries
1. Do not accept delivery or receipt of damaged batteries.
a. If packing materials are damaged, check condition of batteries prior to accepting
shipment.
Note: Refer to site Environmental Work Practice 5.1, Spill Response, for a detailed explanation
of individual responsibilities in the event of a spill.
b. If a spill is found in the truck, follow the S.W.I.M. process:
•
Secure the area. If you do not have the proper protective equipment or training to
clean up the material spilled, wait until trained help arrives.
•
Warn people in the area and keep them away from the spill.
•
Inform the Control Room at ext. 4911 and provide as much information as possible:
-
•
what spilled or leaked, and why
approximately how much spilled
when did the spill occur or when was it discovered
your exact location.
Monitor the area until help arrives.
NSWP 10.0-18
NSWP 10.0
Revision 2
July 1, 2011
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2. After accepting receipt of plant system batteries, NSC Commodity Services personnel shall
apply Chemical Control labels in accordance with site Environmental Work Practice 7.3,
Labeling Chemicals.
3. Some plant system batteries at the sites contain an acid solution, while others contain a
caustic solution. The storage requirements for each are different. Employees shall pay
particular attention to the product label when deciding which storage area to use. Refer to
site Environmental Work Practice 7.2, Storing Chemicals, for detailed information.
4. Waste batteries shall be managed in accordance with site Environmental Work Practice 2.4,
Waste Batteries.
a. Contact site Environmental, Health & Safety (EHS) for assistance.
b. Contact Site Services material handlers to coordinate movement and for transportation
offsite.
Cleaning Batteries
1. Electrical workers working on plant battery systems (including battery cleaning) shall be
trained in the safe work practices, technical skills, and other personnel safety requirements
that pertain to their respective job assignment.
2. Do not smoke or create sparks, arcs, or flames while cleaning batteries.
3. Before beginning actual work or “hands on” battery-related tasks, locate the nearest
emergency eyewash / shower and verify it is operational. If a permanently plumbed unit is
not in the immediate work area (accessible within 10 seconds), obtain a temporary eyewash
/ drench station (i.e., from tool issue) and place it as close to the work as practical.
4. When practical, use the buddy system while cleaning batteries.
5. Do not clean batteries in areas with limited air circulation. Cleaning areas should be well
ventilated and periodically checked using an air monitor (available from tool issue).
a. When using an air monitor, periodically check the LEL (Lower Explosive Limit) display
for an increase in reading. Higher than normal readings for CO (Carbon Monoxide) may
indicate the presence of hydrogen (due to sensor interference), but it will usually be
below explosive levels.
b. If the monitor alarms while in the room or area, exit immediately and contact the site
Environmental, Health & Safety (EHS) group for additional guidance.
Note: Plant batteries may contain either acids or caustics. Review the Chemical Control
label information and / or contact the site Environmental, Health & Safety (EHS)
group to ensure you are aware of the hazards associated with the batteries to be
cleaned.
NSWP 10.0-19
NSWP 10.0
Revision 2
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6. Review the Chemical Control label for health hazard, personal protective equipment, and
first aid information prior to beginning cleaning activities.
7. Use the following personal protective equipment when performing cleaning activities:
•
hard hat
•
eye protection (safety glasses or goggles)
•
appropriate footwear and / or shoe covers
•
emergency eyewash / shower in immediate work area
•
chemical resistant gloves (i.e., nitrile or rubber ≥ 6 mil)
•
full-face shield
•
full body apron (or equivalent).
8. To prevent shock, avoid physical contact with exposed conductors on batteries.
9. Before working on or working near plant battery systems, remove all jewelry (and
watches).
10. Do not short or bridge battery terminals. Tools and other metallic objects (e.g., metal tools,
cutters, key rings, etc.) shall be kept away from the tops of uncovered batteries.
11. Wash your hands and face before eating, drinking, and / or smoking after cleaning batteries.
Do not eat, drink, or use tobacco products while actually cleaning the batteries.
12. Plant battery cleaning is performed using de-mineralized water. Ensure that wastewater,
lead residue, and used rags are handled in accordance with site Environmental Work
Practice 2.1 Satellite Accumulation Areas.
13. Information concerning the proper disposal of lead battery straps can be found in site
Environmental Work Practice 2.5, Miscellaneous Waste Disposal.
.
NSWP 10.0-20
NSWP 10.0
Revision 2
July 1, 2011
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Personal Protective Equipment (PPE) Reference Chart - Working On Plant Battery Systems
When the following jobs are performed in plant battery rooms or battery areas:
This type PPE and / or
equipment is required:
Hard hat
Adjust intercell
connecting
hardware
Required
Read cell
battery
voltage
Required
Add
“demin”
water
Required
Add /
remove
electrolyte
Required
Move lead
acid cells
Required
Check
specific
gravity
Required
Wash / Clean
battery cells
Required
Safety glasses or goggles
Required
Required
Required
Required
Required
Required
Required
Appropriate footwear and /
or shoe covers
Required
Required
Required
Required
Required
Required
Required
Emergency eyewash /
shower in immediate work
area
Chemical resistant gloves
(i.e., nitrile or rubber ≥ 6 mil)
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Required
Full face shield
Required
Required
Required
Required
Full body apron (or
equivalent)
Required
Required
Required
Required
NSWP 10.0-21
NSWP 10.0
Revision 2
July 1, 2011
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Section 4.
Note 1:
Note 2:
Switchgear, Load Centers, and Motor Control Centers
This section applies to the following types of electrical equipment:
•
Switchgear (metal-clad, 1 kV and above)
•
Load Centers (600 V Class Switchgear)
•
Motor Control Centers (MCCs)
•
Other related equipment (including panel boards or switchboards with molded
case or insulated case circuit breakers, motor starters, and small power
transformers).
Based on specific arc flash calculations performed, cabinets or components requiring
arc-rated flame-resistant (FR) protective clothing are identified within the Site specific
FR clothing requirements listed in this section. Switchgear, load centers, and motor
control centers that require additional flame-resistant (FR) protective clothing
(beyond standard arc-rated FR coveralls, or FR shirt and pants, and face shield) are
labeled to identify the safe work boundary / arc flash boundary and minimum rating
of FR clothing required.
Electrical Safety Requirements for Switchgear, Load Center, and MCC-Related Work
1. Before performing switchgear, load center or motor control center (MCC)-related tasks,
ensure individuals have demonstrated appropriate knowledge and skills. Electrical workers
who manipulate or perform work on switchgear, load centers, and MCCs shall be trained in
the safe work practices, technical skills, and other personnel safety requirements that
pertain to their respective job assignment.
2. When working around switchgear, load center or motor control center (MCC) cabinets,
ensure all enclosure-door retaining bolts are secured. For any retaining bolts that do not
secure properly, take appropriate action to have them repaired.
3. For switchgear and load centers, the incident energy analysis data provided under Site
specific flame resistant clothing requirements is valid only when employees are working on
load (feeder) breakers. When employees work on an incoming breaker, they need to deenergize the switchgear using the upstream breaker because the incident energy calculated
does not reflect work on the high side.
4. Before working in the breaker cubicle, ensure the control power source has been removed
(when applicable).
5. When required to remove an energized motor control center cubicle from the bus, either
remove or secure the cubicle to prevent re-engagement to the bus.
6. When a breaker is removed from a cubicle, do not reach into or enter the cubicle until
isolation shutters are verified as closed.
7. Once inside the cubicle, DO NOT remove or open protective isolation shutters unless the
bus is locked and / or tagged out and verified as de-energized.
NSWP 10.0-22
NSWP 10.0
Revision 2
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8. Secure or remove enclosure doors, hinged panels, etc. to prevent them from swinging into
an employee and causing contact with exposed energized parts.
9. When installing or removing grounding devices wear electrical rubber gloves with leather
protectors, eye protection and hard hats. For switchgear, load centers, and motor control
centers, wear arc-rated flame-resistant clothing as described within the Site specific FR
clothing requirements listed in this section.
a. If the equipment has been de-energized per NSD 500, absence of voltage has been
verified (with a voltage testing and / or indicating device), and grounding is not part of
the tag out isolation boundary, standard arc-rated FR coveralls or FR shirt and pants
may be worn when installing or removing grounds.
b. Before applying grounds, de-energize static capacitors for 5 minutes (where
applicable).
c. Before installing, inspect grounding cables and connecting clamps to ensure:
•
all connections are solid
•
wires or conductors are not frayed or corroded.
Note: If energy sources are de-energized according to NGD tag out procedures, Kearney
vise-grip temporary grounding sets are acceptable to control static or induced
voltage, or when used per the manufacturer’s specified amperage ratings.
10. When grounding lines and equipment for the protection of employees ensure grounding
leads are:
•
not less than 2 / 0 flexible stranded copper rubber-covered cable or its equivalent
•
capable of conducting the maximum fault current potential and duration necessary to
clear the fault.
11. When installing grounding cables or materials follow established procedures. Make the
ground connection before taking the ground connection to the equipment or conductor.
12. When removing grounding cables or materials, disconnect the connection to the conductor
or equipment first, and then remove the ground-end connection.
13. Before reinstalling a breaker into the cubicle, check to ensure the breaker is in the open
position.
14. Before returning the breaker to service, remove all grounding cables (if used) and verify that
all door fasteners and hardware are in place and fastened securely.
15. When wearing flame-resistant clothing, ensure that shirts and pants worn underneath are
constructed of natural fibers (e.g., 100% cotton or wool). Wearing arc-rated FR protective
clothing over cotton shirt and pants or layering FR clothing increases the overall Arc
Thermal Performance Value (ATPV) rating provided.
NSWP 10.0-23
NSWP 10.0
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16. When layering FR clothing or wearing the 43 cal/cm2 or 111 cal/cm2 flash suit and hood in
high temperature plant areas (e.g., > 95 degrees), consideration should be made regarding
heat stress and a need to establish employee stay times.
a. Temperatures in the work area, the type of work being performed and the physical
condition of the employee should determine the number of breaks.
b. Employee comfort can be enhanced through frequent breaks or the use of additional
protective equipment such as approved FR cooling vests.
c. When using the 111 cal/cm2 suit repeatedly for subsequent job activities, it is
recommended that employees carry the flash suit and hood to the general work area
and put it on just prior to beginning work. Employees can then remove all or portions of
the suit immediately after work is complete or the area is again safe.
17. When arc flash hoods are worn for tasks lasting > 15 minutes, employees must also
consider ambient temperatures and limited air flow inside the hood, regardless of work area
temperatures. As necessary, fresh air blower units are available for continuous job activities
when the hood cannot be periodically raised or removed.
Note: Face shields made of clear polycarbonate material are more appropriate for use in
situations with relatively low arc flash exposure (e.g., < 4 cal/cm2). Face shield
windows on the market intended for direct exposure to electric flash are currently
made of tinted polycarbonate or polyproprionate (e.g., Oberon “Arc-X ArcShield" or
Salisbury “Pro-Shield”).
18. When performing work inside of ANY electrical enclosure and when within reaching distance
of an unprotected energized or potentially energized circuit > 400 V, employees shall wear:
•
safety glasses
•
hard hat
•
face shield
•
standard arc-rated FR coveralls or FR shirt and pants (minimum)
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
Note: If electrical rubber gloves prevent an employee from satisfactorily manipulating a
“kirk-key” interlock or inserting a switchgear racking tool, electrical rubber gloves may
be temporarily removed. If face shields or arc flash hoods prevent an employee from
satisfactorily manipulating a “kirk-key” interlock or inserting a switchgear racking tool,
the face shield or arc flash hood may also be temporarily removed. Ensure electrical
rubber gloves, face shield or arc flash hood are donned prior to racking breakers.
NSWP 10.0-24
NSWP 10.0
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19. Wear the following personal protective equipment when racking breakers in or out, opening
and closing disconnects with enclosure doors open, and when installing or removing
breakers from cubicles (with no isolation shutter), if one or more energy sources > 400 V are
available (e.g., NOT locked and / or tagged out):
•
safety glasses
•
hard hat
•
arc-rated flame-resistant clothing and face shield as described within this section
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
20. All individuals within the established safe work boundary / arc flash boundary shall wear
required PPE for the activity.
21. If there is a work-related need for non-electrical workers to enter or stand within the
established safe work boundary / arc flash boundary of energized switchgear, load center or
MCC-related work activities, ensure all work can be performed safely. Before non-electrical
workers enter the safe work boundary / arc flash boundary, ensure the following conditions
are met:
Note: These conditions only allow non-electrical workers to enter the established work
area. They do not allow non-electrical workers to work on or work near exposed
energized electrical equipment (i.e., within reaching distance of an exposed circuit or
inside the “MINIMUM APPROACH DISTANCE”).
•
employees must understand and be able to maintain the “MINIMUM APPROACH
DISTANCE” for voltage present
•
employees must be knowledgeable of the construction and operation of the equipment
or a specific work method being performed
•
employees must be dressed in appropriate PPE for potential arc flash hazards (e.g.,
safety glasses, hard hat, arc-rated FR clothing and face shield as described in this
section, and flame-resistant or leather work gloves)
•
employees must be able to distinguish exposed live parts from other parts of electrical
lines and equipment
•
employees must know or be able to determine the nominal voltage of the exposed live
parts.
22. When pulling potential transformer drawers (or other drawers associated with switchgear)
and / or removing or reinserting associated fuses (not including control power fuses) on 4.16
kV, 6.9 kV, 13.8 kV or 22 kV switchgear, employees shall wear:
•
safety glasses
•
hard hat
•
arc-rated flame-resistant clothing and face shield as described in this section
NSWP 10.0-25
NSWP 10.0
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•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
23. When performing work on the inside of an energized switchgear > 400 V, including voltage
testing, or when working on or working near the switchgear’s control circuits having
energized parts > 150 V, employees shall wear:
•
safety glasses
•
hard hat
•
arc-rated flame-resistant clothing and face shield as described in this section
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
24. On motor control centers, when it is necessary to open enclosure doors to observe
components operate as the equipment is being energized, employees shall stand to the
side and as far away as possible (but close enough for an accurate visual observation) and
wear the following personal protective equipment:
•
safety glasses
•
hard hat
•
arc-rated flame-resistant clothing and face shield as described in this section
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
25. When it is necessary to open enclosure doors to manipulate a circuit breaker or switch
>400 V inside an energized or potentially energized enclosure, employees should stand to
the side and turn to face away from the breaker (if possible). With enclosures open,
employees shall wear the following personal protective equipment:
•
safety glasses
•
hard hat
•
arc-rated flame-resistant clothing and face shield as described in this section
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
26. To manipulate a pistol grip, lever, mechanical operator, or breaker control switch on or within
the safe work boundary / arc flash boundary for an energized switchgear breaker > 4160 V
(with enclosure doors open or closed), employees should stand to the side and turn to
face away from the panel (if possible). Employees shall wear the following personal
protective equipment:
•
safety glasses
•
hard hat
NSWP 10.0-26
NSWP 10.0
Revision 2
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•
arc-rated flame-resistant clothing and face shield as described in this section (unless
otherwise posted)
•
electrical rubber gloves with leather protectors (unless otherwise posted)
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs.
27. The following tasks allow for a reduction in FR protective clothing and the required safe work
boundary / arc flash boundary.
a. When performing work on energized parts inside a load center or motor control
center, including voltage testing, or if working on or working near the load center or
MCC’s control circuits having energized parts > 150 V, as long as the breaker is not
being opened or closed and / or the breaker is not being racked on or off the bus
employees only need to wear the following personal protective equipment:
•
safety glasses
•
hard hat
•
face shield
•
standard arc-rated FR coveralls (i.e., 12 cal/cm2)
•
electrical rubber gloves with leather protectors
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs
•
maintain a 10 ft. arc flash boundary (minimum).
Note: When opening a switchgear enclosure, the following PPE exception does not apply
if employees must work on or work near exposed energized circuits > 400 V (i.e.,
within reaching distance of the exposed circuit or inside the “MINIMUM APPROACH
DISTANCE”).
b. When opening an energized switchgear, load center or motor control center
enclosure (exposing the high voltage compartment) to perform visual inspections, verify
the placement of a red tag, take thermography readings and perform meter / relay
testing; or if working on or working near the switchgear, load center or MCC’s control
circuits having energized parts < 150 V, as long as the breaker is not being opened or
closed and / or the breaker is not being racked on or off the bus employees only
need to wear the following personal protective equipment:
•
safety glasses
•
hard hat
•
standard arc-rated FR coveralls, long FR switching coat with leggings, or FR shirt
and pants
•
if exposed to live parts, with potential for contacting > 600 V (nominal), work in pairs
•
maintain a 10 ft. arc flash boundary (minimum).
NSWP 10.0-27
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
c. To manipulate a pistol grip, lever, mechanical operator, or breaker control switch on or
within the safe work boundary / arc flash boundary for an energized load center or
motor control center that requires additional FR protective clothing (i.e., 43 or 111
cal/cm2 flash suit per this section), employees only need to wear the following personal
protective equipment when enclosure doors are in place (closed and secured).
•
safety glasses
•
hard hat
•
standard arc-rated FR coveralls, long FR switching coat with leggings, or FR shirt
and pants and face shield (unless otherwise posted)
•
flame-resistant or leather work gloves
•
maintain a 10 ft. arc flash boundary (minimum).
d. To manipulate a pistol grip, lever, mechanical operator, or breaker control switch on or
within the safe work boundary / arc flash boundary for an energized load center or
motor control center that requires standard FR protective clothing (i.e., 12 cal/cm2
arc-rated coveralls per this section), employees only need to wear the following personal
protective equipment when enclosure doors are in place (closed and secured).
•
•
•
•
safety glasses
hard hat
no arc flash boundary required, but provide adequate warning for others in
immediate area
no FR protective clothing required, but do not wear clothing made from synthetic
materials such as nylon, or polyester and cotton blends
28. Arc flash PPE may be removed under the following conditions:
a. For switchgear and load centers with isolation shutters, after the breaker has been
racked out to the TEST or DISCONNECT position (i.e., shutter is closed and bus is not
exposed), arc flash protective clothing and electrical rubber gloves may be removed.
Note: For switchgear and load centers with no isolation shutter (bus exposed), arc-rated
flame resistant protective clothing and face shield as described in this section are
required to install or remove breakers from cubicles.
b. For switchgear and load centers with isolation shutters, after the breaker has been
racked out to the TEST or DISCONNECT position (i.e., shutter is closed and bus is not
exposed) arc flash protective clothing and electrical rubber gloves are not required to
perform maintenance inside the cubicle or to remove the breaker from the cubicle.
c. For 600 V MCCs, ensure the breaker cubicle has been disconnected from the bus and
verify that bus voltage has been removed from the cubicle. After the breaker cubicle is
secured and locked in the lock-out position to prevent re-engagement to the bus (or an
approved non-conductive barrier [e.g., rubber blanket, Plexiglas or equivalent spacer] is
placed between the breaker stabs and the bus), arc flash protective clothing and
electrical rubber gloves may be removed.
NSWP 10.0-28
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
29. During plant emergency situations affecting "nuclear safety", workers may be required to
perform "time critical" actions to protect the health and safety of the general public. If station
management determines that insufficient time exists to obtain required arc flash PPE, these
requirements may be waived.
a. Station management shall weigh the risk of overall "nuclear safety" versus "industrial
safety" for unique emergency tasks.
b. Alternate protection taken under such crucial operating functions may include, but is not
limited to:
•
•
•
•
using a FR switching coat w/ face shield instead donning the complete flash suit and
hood ensemble
donning or wearing portions of the flash suit to reduce employee exposure
using arc-rated FR curtains or freestanding screens between the employee and
equipment to provide supplemental protection
standing to the side and turning to reduce exposure to the face and body.
Site Specific Flame Resistant Clothing Requirements for CNS
Note 1: For Switchgear, Load Centers, and Motor Control Centers not specifically listed,
wear standard arc-rated FR coveralls or FR shirt and pants. The safe work
boundary / arc flash boundary for equipment not specifically listed is 10 feet.
Note 2: Long FR switching coat with leggings and “Pro-Shield" or "Arc-X" face shield may
be used in lieu of arc-rated FR coveralls where job does not expose lower body or
legs to direct arc flash.
Note 3: Hearing protection required for components with an ATPV > 8 cal/cm2 and as
designated with an asterisk (*).
CNS Flame Resistant (FR) Clothing Category A:
FR coveralls with a minimum Arc Thermal Performance Value (ATPV) of 12 cal/cm2,
w/ green Arc-X face shield (or equivalent) required.
Equipment Assigned
To Category
1ELXA *
1ELXB *
1ELXC
1ELXD
1EMXA
NSWP 10.0-29
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary Incident Energy
(ft)
(cal/cm2)
10
8.8
10
9.2
10
7.9
10
7.9
10
5.9
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category A (cont'd)
Equipment Assigned
To Category
1EMXB
1EMXC
1EMXD
1EMXE
1EMXF
1EMXG
1EMXI
1EMXJ
1EMXK
1EMXL
1EMXO
1EMXQ
1EMXR
1EMXS
1LXA *
1LXB *
1LXE *
1LXF *
1LXG *
1LXN *
1MXA
1MXB
1MXC
1MXD
1MXE
1MXF
1MXG
1MXH
1MXI
1MXJ
1MXK
NSWP 10.0-30
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
6.2
6.9
7.1
5.3
5.6
6.3
5.5
5.3
6.2
6.7
5.8
6.4
6.4
0.1
9.7
9.6
9.0
9.3
9.2
9.3
7.7
5.3
7.7
6.5
4.0
5.6
5.9
6.3
2.7
4.4
5.1
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category A (cont'd)
Equipment Assigned
To Category
1MXM
1MXN
1MXO *
1MXP
1MXQ
1MXR
1MXY
1MXZ
1SLXA *
1SLXB *
1SLXC *
1SLXD *
2ELXA *
2ELXB *
2ELXC *
2ELXD
2EMXA
2EMXB
2EMXC
2EMXD
2EMXE
2EMXF
2EMXH
2EMXI
2EMXJ
2EMXK
2EMXL
2EMXP
2EMXQ *
2EMXR *
NSWP 10.0-31
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
5.8
6.0
8.0
7.4
7.7
6.9
5.3
5.9
10.4
9.7
10.0
8.8
9.0
9.1
8.0
7.8
6.1
4.9
6.4
7.0
5.3
5.1
6.4
5.5
5.2
6.8
6.5
5.6
8.1
8.1
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category A (cont'd)
Equipment Assigned
To Category
2EMXS
2LXA *
2LXB *
2LXE *
2LXF *
2LXG *
2LXN *
2MXA
2MXB
2MXC
2MXD
2MXE
2MXF
2MXG
2MXH
2MXJ
2MXK
2MXM
2MXN
2MXO
2MXP
2MXQ
2MXR
2MXW *
2MXX *
2MXY
2MXZ
2SLXA *
2SLXB *
2SLXC *
2SLXD *
NSWP 10.0-32
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
0.1
9.4
9.7
8.8
9.3
9.1
9.3
7.5
5.2
7.4
6.3
3.6
5.6
5.6
5.9
4.4
5.0
5.7
5.8
7.3
7.3
7.4
7.0
9.9
10.5
5.2
5.8
8.8
10.4
9.8
9.4
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category A (cont'd)
Equipment Assigned
To Category
PHP-1A
PHP-1B
PHP-1C
PHP-1D
PHP-2A
PHP-2B
PHP-2C
PHP-2D
SMXA
SMXB
SMXC
SMXD
SMXE
SMXG *
SMXH
SMXM
SMXN
SMXN1
SMXO
SMXP
SMXP2
SMXP4
SMXR
SMXR3
SMXR5
SMXR6
SMXS
SMXT
SMXU
SMXV
SMXW
SMXX *
SMXY
NSWP 10.0-33
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
2.1
1.6
2.7
2.3
2.1
2.2
2.6
2.4
6.8
6.4
5.7
6.9
0.9
9.2
4.6
4.7
3.1
3.3
5.0
4.1
0.5
0.5
4.2
0.5
0.5
0.5
7.7
7.1
7.0
6.3
6.2
10.1
4.1
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category B:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of 43
cal/cm2 required.
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Note 2: Long FR switching coat with leggings and flash hood may be used in lieu of flash
suit and hood where job does not expose lower body or legs to direct arc flash.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
1ETA
4.16
20
30.7
1ETB
4.16
20
30.9
1FTA
4.16
20
24.1
1FTB
4.16
20
23.9
1GTA
4.16
20
26.2
1GTB
4.16
20
26.5
1LXC
0.6
20
12.4
1LXD
0.6
20
12.3
1LXH
0.6
20
14.6
1LXI
0.6
20
15.0
1MXS1
0.6
20
16.9
1MXS2
0.6
20
16.9
1MXS3
0.6
20
16.9
1MXT1
0.6
20
16.7
1MXT2
0.6
20
16.7
1MXT3
0.6
20
16.7
1MXU1
0.6
20
16.7
1MXU2
0.6
20
16.7
1MXU3
0.6
20
16.7
1MXW
0.6
20
12.5
1MXX
0.6
20
12.2
1SLXG
0.6
20
12.2
2ETA
4.16
20
32.4
2ETB
4.16
20
32.6
2FTA
4.16
20
24.3
2FTB
4.16
20
24.2
2GTA
4.16
20
25.8
NSWP 10.0-34
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category B (cont'd)
Equipment Assigned
To Category
2GTB
2LXC
2LXD
2LXH
2LXI
2MXS1
2MXS2
2MXS3
2MXT1
2MXT2
2MXT3
2MXU1
2MXU2
2MXU3
SMXI
SMXIA
Voltage
(kV)
4.16
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
Incident
Energy
(cal/cm2)
26.3
12.5
12.5
15.3
14.2
17.0
17.0
17.0
16.9
16.9
16.9
16.9
16.9
16.9
39.0
39.0
CNS Flame Resistant (FR) Clothing Category C:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of
111 cal/cm2 required.
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Equipment Assigned
To Category
1HTA
1MXL
1TA-B
1TB-B
1TC-A
1TD-B
2HTA
NSWP 10.0-35
Voltage
(kV)
13.8
0.6
6.9
6.9
6.9
6.9
13.8
Arc Flash Boundary
(ft)
30
30
30
30
30
30
30
Incident
Energy
(cal/cm2)
43.3
72.6
103.1
96.6
97.2
104.6
43.2
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
CNS Flame Resistant (FR) Clothing Category C (cont'd)
Equipment Assigned
To Category
2MXI
2MXL
2TA-A
2TB-B
2TC-A
2TC-B
2TD-B
Ice Cond Pnl ICP 1A
Ice Cond Pnl ICP 1B
Ice Cond Pnl ICP 2A
Ice Cond Pnl ICP 2B
SMXF
SMXK
Voltage
(kV)
0.6
0.6
6.9
6.9
6.9
6.9
6.9
0.24
0.24
0.24
0.24
0.6
0.6
Arc Flash Boundary
(ft)
30
30
30
30
30
30
30
30
30
30
30
30
30
Incident
Energy
(cal/cm2)
60.5
72.6
104.9
100.0
95.7
99.2
103.5
59.8
61.7
61.0
61.8
43.8
51.1
CNS Flame Resistant (FR) Clothing Category D:
Flash suit and hood with Arc Thermal Performance Value (ATPV) of 140 cal/cm2 or a
111 cal/cm2 flash suit and hood worn (layered) over untreated 100 % cotton long
sleeve shirt and pants required (to achieve ATPV level >116 cal/cm2).
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
1TA-A
6.9
30
111.7
1TB-A
6.9
30
114.2
1TC-B
6.9
30
111.9
1TD-A
6.9
30
115.6
2TA-B
6.9
30
111.6
2TB-A
6.9
30
111.3
2TD-A
6.9
30
115.1
NSWP 10.0-36
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
Site Specific Flame Resistant Clothing Requirements for MNS
Note 1: For Switchgear, Load Centers, and Motor Control Centers not specifically listed,
wear standard arc-rated FR coveralls or FR shirt and pants. The safe work
boundary / arc flash boundary for equipment not specifically listed is 10 feet.
Note 2: Long FR switching coat with leggings and “Pro-Shield" or "Arc-X" face shield may
be used in lieu of arc-rated FR coveralls where job does not expose lower body or
legs to direct arc flash.
Note 3: Hearing protection required for components with an ATPV > 8 cal/cm2 and as
designated with an asterisk (*).
MNS Flame Resistant (FR) Clothing Category A:
FR coveralls with a minimum Arc Thermal Performance Value (ATPV) of 12 cal/cm2,
w/ green Arc-X face shield (or equivalent) required.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
1ELXA *
0.6
10
10.0
1ELXB *
0.6
10
9.9
1ELXC *
0.6
10
8.8
1ELXD *
0.6
10
8.8
1EMXA
0.6
10
7.1
1EMXA1
0.6
10
0.6
1EMXA2 *
0.6
10
9.4
1EMXA3
0.6
10
0.9
1EMXA4
0.6
10
0.8
1EMXA5
0.6
10
0.5
1EMXB
0.6
10
7.0
1EMXB1
0.6
10
1.7
1EMXB2
0.6
10
1.8
1EMXB3
0.6
10
1.8
1EMXB4 *
0.6
10
9.5
1EMXB5
0.6
10
0.9
1EMXC *
0.6
10
8.0
1EMXD *
0.6
10
8.0
1EMXE
0.6
10
7.9
1EMXF *
0.6
10
8.5
1EMXG
0.6
10
0.6
NSWP 10.0-37
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
MNS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
1EMXH
1EMXH1
1EPB BK - NCP 1A safety bkr
1EPB BK - NCP 1B safety bkr
1EPB BK - NCP 1C safety bkr
1EPB BK - NCP 1D safety bkr
1ETA *
1ETB *
1LXA
1LXB
1LXC *
1LXD
1LXE
1LXF
1LXG *
1MXA
1MXB
1MXC
1MXD
1MXF
1MXG
1MXH
1MXJ
1MXK
1MXM
1MXMA
1MXN
1MXNA
1SLXA
1SLXB
1SLXC
1SLXD
1SLXF
1SLXG
1SLXH *
2ELXA *
2ELXB *
2ELXC *
NSWP 10.0-38
Voltage
(kV)
0.6
0.6
6.9
6.9
6.9
6.9
4.16
4.16
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
0.7
0.5
5.6
5.0
5.1
5.2
8.9
8.8
6.1
6.5
8.0
6.7
6.2
7.6
8.3
1.8
2.2
1.7
1.6
1.9
1.9
1.8
1.3
2.2
1.9
0.7
2.1
0.8
5.9
6.1
6.1
6.1
6.8
7.3
8.9
10.2
10.1
9.0
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
MNS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
2ELXD *
2EMXA
2EMXA-1
2EMXA- *2
2EMXA-3
2EMXA-4
2EMXA-5
2EMXB
2EMXB-1
2EMXB-1 2ELXB-05C Trips *
2EMXB-2
2EMXB-2 2ELXB-05C Trips
2EMXB-3
2EMXB-3 2ELXB-05C Trips
2EMXB-4 *
2EMXB-5
2EMXC *
2EMXD *
2EMXE *
2EMXF *
2EMXG
2EMXH
2EPB BK - NCP 2A safety bkr
2EPB BK - NCP 2B safety bkr
2EPB BK - NCP 2C safety bkr
2EPB BK - NCP 2D safety bkr
2ETA *
2ETB *
2LXA
2LXB
2LXC *
2LXD
2LXE
2LXF
2LXG *
2MXA
2MXB
2MXC
NSWP 10.0-39
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
6.9
6.9
6.9
6.9
4.16
4.16
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
9.0
7.2
0.6
10.0
0.9
0.9
0.8
7.0
N/A
10.4
N/A
6.7
N/A
6.8
9.8
0.9
8.3
9.5
8.6
8.7
6.0
6.3
5.8
5.0
5.4
5.4
8.9
8.8
6.3
6.7
8.4
7.0
6.1
7.9
8.6
1.8
2.3
1.6
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
MNS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
2MXD
2MXE
2MXF
2MXG
2MXH
2MXJ
2MXK
2MXM
2MXMA
2MXN
2MXNA
2SLXA
2SLXB
2SLXC
2SLXD
2SLXF
2SLXG *
2SLXH *
2SLXI
Ice Cond Pnl ICP 1A
Ice Cond Pnl ICP 1B
Ice Cond Pnl ICP 2A
Ice Cond Pnl ICP 2B
Rx & Mg Set Switchgear U-1
Rx & Mg Set Switchgear U-2
SMXA
SMXB
SMXC
SMXD
SMXE
SMXG
SMXG1
SMXH
SMXI
SMXIA
SMXJ
SMXK
SMXLA
NSWP 10.0-40
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.24
0.24
0.24
0.24
0.26
0.26
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
1.6
1.1
1.8
1.6
1.8
1.5
2.0
1.3
0.7
2.2
0.9
6.6
5.8
6.0
6.6
5.7
8.1
8.9
7.0
0.3
0.3
0.3
0.3
4.2
4.2
1.4
1.4
1.6
1.7
0.5
2.7
2.7
1.0
1.0
0.6
1.3
1.4
0.2
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
MNS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
SMXM
SMXO
SMXQ
SMXS
SMXT
SMXU
SMXV
SMXW *
SMXY
SMXZ
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
1.2
5.0
7.1
2.2
2.0
2.1
1.7
9.7
7.8
1.3
MNS Flame Resistant (FR) Clothing Category B:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of 43
cal/cm2 required.
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Note 2: Long FR switching coat with leggings and flash hood may be used in lieu of flash
suit and hood where job does not expose lower body or legs to direct arc flash.
Equipment Assigned
To Category
1HTA
2HTA
208/120 Pnlbd No. SWH1 U-1
208/120 Pnlbd No. SWH1 U-2
SMXL - MCCB
SMXL -LVPCB
SMXP
SMXR
NSWP 10.0-41
Voltage
(kV)
13.8
13.8
0.208
0.208
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
20
20
20
20
20
20
20
20
Incident
Energy
(cal/cm2)
20.1
20.0
40.6
40.6
34.8
34.8
12.8
12.8
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
MNS Flame Resistant (FR) Clothing Category C:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of
111 cal/cm2 required.
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Incident
Equipment Assigned
Voltage
Energy
Arc Flash Boundary
To Category
(kV)
(ft)
(cal/cm2)
1TA
6.9
30
86.9
1TB
6.9
30
78.4
1TC
6.9
30
76.3
1TD
6.9
30
83.3
2TA
6.9
30
88.2
2TB
6.9
30
76.7
2TC
6.9
30
77.5
2TD
6.9
30
84.3
Site Specific Flame Resistant Clothing Requirements for ONS
Note 1: For Switchgear, Load Centers, and Motor Control Centers not specifically listed,
wear standard arc-rated FR coveralls or FR shirt and pants. The safe work
boundary / arc flash boundary for equipment not specifically listed is 10 feet.
Note 2: Long FR switching coat with leggings and “Pro-Shield" or "Arc-X" face shield may
be used in lieu of arc-rated FR coveralls where job does not expose lower body or
legs to direct arc flash.
Note 3: Hearing protection required for components with an ATPV > 8 cal/cm2 and as
designated with an asterisk (*).
ONS Flame Resistant (FR) Clothing Category A:
FR coveralls with a minimum Arc Thermal Performance Value (ATPV) of 12 cal/cm2,
w/ green Arc-X face shield (or equivalent) required.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
13.8 kV K-Bus 1 (Gen Online)
13.8
10
4.7
13.8 kV K-Bus 1 (Hi-Side
Disconnects, Gen Offline)
13.8
10
1.0
13.8 kV K-Bus 2 (Gen Online)
13.8
10
4.7
13.8 kV K-Bus 2 (Hi-Side
Disconnects, Gen Offline)
13.8
10
1.0
NSWP 10.0-42
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
4.16 kV Swgr B1T
4.16 kV Swgr B2T
4.16 kV Swgr B3T
4.16 kV Swgr B4T
480 V 2XUF
480 V 3XUE-1
480 V 3XUF
480 V MCC 1XUE-1
480 V MCC 1XUF
480 V MCC XOD3-1
480 V MCC XOD3-2
480 V RWH
6.9 kV Swgr Fdr 1TA-04 (50)
600 V 1XQ
600 V 1X12
600 V 2X12
600 V 2XUA
600 V 2XUB
600 V 3X12 *
600 V 3XUA
600 V 3XUB
600 V 3XUD
600 V 3XUE
600 V ESV
600 V Load center SLXOD-1B
600 V MCC 1XA
600 V MCC 1XB
600 V MCC 1XC
600 V MCC 1XD
600 V MCC 1XE
600 V MCC 1XF
600 V MCC 1XGA
600 V MCC 1XGB
NSWP 10.0-43
Voltage
(kV)
4.16
4.16
4.16
4.16
0.48
0.48
0.48
0.48
0.48
0.48
0.48
0.48
6.9
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
5.0
5.0
6.7
7.3
0.2
0.2
0.2
0.3
0.2
0.2
0.2
0.3
5.4
0.9
7.3
7.2
1.4
1.1
9.2
1.9
1.6
1.9
1.5
0.2
6.7
1.3
1.3
1.3
1.6
1.5
1.4
1.3
1.1
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
600 V MCC 1XH
600 V MCC 1XI
600 V MCC 1XJ
600 V MCC 1XK
600 V MCC 1XL
600 V MCC 1XN
600 V MCC 1XO
600 V MCC 1XP
600 V MCC 1XR
600 V MCC 1XS4
600 V MCC 1XS5
600 V MCC 1XS6
600 V MCC 1XT
600 V MCC 1XUA
600 V MCC 1XUB
600 V MCC 1XUC
600 V MCC 1XUD
600 V MCC 1XUE
600 V MCC 2XA
600 V MCC 2XB
600 V MCC 2XC
600 V MCC 2XD
600 V MCC 2XE
600 V MCC 2XF
600 V MCC 2XGA
600 V MCC 2XGB
600 V MCC 2XH
600 V MCC 2XI
600 V MCC 2XJ
600 V MCC 2XK
600 V MCC 2XL
600 V MCC 2XN
600 V MCC 2XO
NSWP 10.0-44
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
1.2
1.1
1.2
0.8
1.3
1.2
1.4
1.3
1.2
6.0
6.5
7.4
1.2
1.5
0.4
0.8
1.2
1.3
1.3
1.3
1.3
1.6
1.5
1.4
1.3
1.1
1.2
1.1
1.2
0.8
1.3
1.2
1.4
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
600 V MCC 2XP
600 V MCC 2XR
600 V MCC 2XS3 *
600 V MCC 2XS4
600 V MCC 2XS5
600 V MCC 2XS6
600 V MCC 2XT
600 V MCC 3XA
600 V MCC 3XB
600 V MCC 3XC
600 V MCC 3XD
600 V MCC 3XE
600 V MCC 3XF
600 V MCC 3XGA
600 V MCC 3XGB
600 V MCC 3XH
600 V MCC 3XI
600 V MCC 3XJ
600 V MCC 3XK
600 V MCC 3XL
600 V MCC 3XN
600 V MCC 3XO
600 V MCC 3XP
600 V MCC 3XR
600 V MCC 3XS3 *
600 V MCC 3XS4
600 V MCC 3XS5
600 V MCC 3XS6
600 V MCC 3XT
600 V MCC XOD3
600 V MCC XOD4
600 V Pnl ABPP
600 V Pnl HMS1
NSWP 10.0-45
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
1.3
1.2
11.5
6.0
6.5
7.4
1.2
1.3
1.3
1.3
1.6
1.5
1.4
1.3
1.1
1.2
1.1
1.2
0.8
1.3
1.2
1.4
1.3
1.2
11.5
6.0
6.5
7.4
1.2
1.5
0.3
1.7
2.0
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
600 V Pnl SB2
600 V Pnl WFSP2
600 V RCP Mtr Refurb
600 V RW1 *
600 V RW2 *
600 V WFSP1 (incoming bkr)
600 V XM
600 V XMS1 *
600 V XOD1
600 V XOD2A
600 V XOD2B
600 V XOD2C
600 V XRWA
600 V XRWB
600 V XRWC
600 V XRWD
600 V XRWE
600 V XRWF
600 V XRWG
600 V XWT
Keowee 600 V MCC 1XA
Keowee 600 V MCC 1XS
Keowee 600 V MCC 2XA
Keowee 600 V MCC 2XS
Keowee 600 V PP K-KSP-1
SSF 600 V MCC Center PXSF
SSF 600 V MCC Center XSF
0PSWSXTRN007 (Switch)
0PSWSXTRN008 (Switch)
1HPISXALGN001 (Switch)
1HPISXTRNN001/2 (Switch)
1PSWSXTRN001 (Switch)
1PSWSXTRN002 (Switch)
NSWP 10.0-46
Voltage
(kV)
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.575
0.575
4.16
4.16
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
1.7
0.5
3.2
9.6
10.1
0.5
0.6
8.2
0.3
0.3
0.6
1.0
1.1
1.1
1.0
1.0
1.2
1.1
1.2
0.5
6.6
6.6
6.7
6.7
0.3
0.7
1.0
0.1
0.2
1.4
1.4
0.4
0.4
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category A (cont'd):
Equipment Assigned
To Category
1PSWSXTRN004 (Switch)
1PSWSXTRN005 (Switch)
1 XPSW - MCC
2HPISXALGN001 (Switch)
2HPISXTRN001/2 (Switch)
2PSWSXTRN001 (Switch)
2PSWSXTRN002 (Switch)
2PSWSXTRN003 (Switch)
2PSWSXTRN004 (Switch)
2PSWSXTRN005 (Switch)
2 XPSWA MCC *
2 XPSWB MCC *
3HPISXALGN001 (Switch)
3HPISXTRN001/2 (Switch)
3PSWSXTRN001 (Switch)
3PSWSXTRN002 (Switch)
3PSWSXTRN003 (Switch)
3PSWSXTRN004 (Switch)
3PSWSXTRN005 (Switch)
Voltage
(kV)
0.6
0.6
0.6
4.16
4.16
0.6
0.6
0.6
0.6
0.6
0.6
0.6
4.16
4.16
0.6
0.6
0.6
0.6
0.6
Arc Flash Boundary
(ft)
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Incident
Energy
(cal/cm2)
4.6
2.6
7.6
1.5
1.5
0.5
0.5
5.0
5.0
3.0
8.9
8.9
2.3
1.4
0.6
0.6
5.3
5.3
3.2
ONS Flame Resistant (FR) Clothing Category B:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of
43 cal/cm2 required.
Note 1: Hearing protection also required for tasks requiring this level of FR clothing.
Note 2: Long FR switching coat with leggings and flash hood may be used in lieu of flash
suit and hood where job does not expose lower body or legs to direct arc flash.
Equipment Assigned
To Category
4.16 kV Swgr 1TC
4.16 kV Swgr 1TD
4.16 kV Swgr 1TE
4.16 kV Swgr 2TC
NSWP 10.0-47
Voltage
(kV)
4.16
4.16
4.16
4.16
Arc Flash Boundary
(ft)
20
20
20
20
Incident
Energy
(cal/cm2)
32.0
31.9
31.7
32.0
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category B (cont'd):
Equipment Assigned
To Category
4.16 kV Swgr 2TD
4.16 kV Swgr 2TE
4.16 kV Swgr 3TC
4.16 kV Swgr 3TD
4.16 kV Swgr 3TE
600 V Load center 1X8
600 V Load center 1X9
600 V Load center 1X10
600 V Load center 2X8
600 V Load center 2X9
600 V Load center 2X10
600 V Load center 3X8
600 V Load center 3X9
600 V Load center 3X10
600 V MCC 1XS1
600 V MCC 1XS2
600 V MCC 1XS3
600 V MCC 2XS1
600 V MCC 2XS2
600 V MCC 2XS3
600 V MCC 3XS1
600 V MCC 3XS2
600 V MCC 3XS3
Keowee 600V Load center 1X
Keowee 600V Load center 2X
Keowee 600 V PP K-KIP-1
SSF 600 V Loadcenter OXSF
SSF 4.16 kV Swgr OTS1-1
3 XPSW MCC
B6T - MV SW
B7T - MV SW
OST1 SWGR
PSWXTRN009 (Switch)
XPSW MCC
NSWP 10.0-48
Voltage
(kV)
4.16
4.16
4.16
4.16
4.16
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
4.16
0.6
13.8
13.8
4.16
0.6
0.6
Arc Flash Boundary
(ft)
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
Incident
Energy
(cal/cm2)
31.9
31.7
32.0
31.9
31.7
14.3
14.6
15.5
14.3
14.6
15.5
14.3
14.6
15.5
21.4
20.5
12.7
21.4
20.5
12.7
21.4
20.5
12.7
39.1
39.1
29.9
12.2
30.2
12.5
17.5
17.6
13.3
14.2
21.7
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
ONS Flame Resistant (FR) Clothing Category C:
Flash suit and hood with a minimum Arc Thermal Performance Value (ATPV) of
111 cal/cm2 required.
Note: Hearing protection also required for tasks requiring this level of FR clothing.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
6.9 kV Swgr 1TA
6.9
30
61.0
6.9 kV Swgr 1TB
6.9
30
60.8
6.9 kV Swgr 2TA
6.9
30
61.0
6.9 kV Swgr 2TB
6.9
30
60.8
6.9 kV Swgr 3TA
6.9
30
61.0
6.9 kV Swgr 3TB
6.9
30
60.8
600 V Load center 1X1
0.6
30
94.7
600 V Load center 1X2
0.6
30
88.9
600 V Load center 1X3
0.6
30
86.4
600 V Load center 1X4
0.6
30
81.0
600 V Load center 1X6
0.6
30
103.9
600 V Load center 2X1
0.6
30
94.7
600 V Load center 2X2
0.6
30
88.9
600 V Load center 2X3
0.6
30
86.4
600 V Load center 2X4
0.6
30
81.0
600 V Load center 2X6
0.6
30
103.9
600 V Load center 3X1
0.6
30
94.7
600 V Load center 3X2
0.6
30
88.9
600 V Load center 3X3
0.6
30
86.4
600 V Load center 3X4
0.6
30
81.0
600 V Load center 3X6
0.6
30
103.9
600 V MCC 1XSF
0.6
30
45.2
600 V MCC 2XSF
0.6
30
45.2
600 V MCC 3XSF
0.6
30
45.2
B6T Swgr
4.16
30
68.7
B7T Swgr
4.16
30
68.7
Keowee KPF No. 9, 10, 11 & 12
13.8
30
75.9
PSWLX PX13
0.6
30
70.0
NSWP 10.0-49
NSWP 10.0
Revision 2
July 1, 2011
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ONS Flame Resistant (FR) Clothing Category D:
Flash suit and hood with Arc Thermal Performance Value (ATPV) of 111 cal/cm2 worn
(layered) over untreated 100 % cotton long sleeve shirt and pants required (to achieve
ATPV > 115 cal/cm2).
Note: Hearing protection also required for tasks requiring this level of FR clothing.
Incident
Equipment Assigned
Voltage
Arc Flash Boundary
Energy
To Category
(kV)
(ft)
(cal/cm2)
600 V Load center 1X5
0.6
30
114.8
600 V Load center 1X7
0.6
30
112.4
600 V Load center 2X5
0.6
30
114.8
600 V Load center 3X5
0.6
30
114.8
Section 5.
Switchyard
1. Before performing work activities within the switchyard, ensure individuals have
demonstrated appropriate knowledge and skills. Electrical workers who perform switching
operations or perform work on load centers and power apparatus cabinets within the
switchyard shall be trained in the safe work practices, technical skills, and other personnel
safety requirements that pertain to their respective job assignment.
2. Only employees skilled and qualified to perform electrical work or specific job tasks are
permitted to work on or work near exposed energized electrical parts or equipment within
the switchyard.
3. All other employees (e.g., mechanics, painters, observers, etc.) who must access the
switchyard shall stay a minimum of 10 feet away from exposed energized electrical
equipment unless there is a work-related need to enter an established safe work boundary /
arc flash boundary. Based on actual voltage levels of exposed overhead lines or busses,
230 kV requires a 16 ft. clearance; 525 kV requires a 26 ft. clearance.
4. In switchyard pre-job briefings, include the location of energized equipment in or adjacent to
the work area.
5. To enter the switchyard, employees shall contact the Site Switchyard Coordinator or
designee (e.g., Work Control Center SRO) and communicate their reason for entry.
a. Routine entry by Operations and Electrical Transmission (Region TE) only requires
notification of:
•
Work Control Center SRO
•
Transmission Control Center (TCC): 704-382-9404
NSWP 10.0-50
NSWP 10.0
Revision 2
July 1, 2011
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b. Entry by all other personnel requires prior notification and permission from:
•
Site Switchyard Coordinator
•
Work Control Center SRO
•
Transmission Control Center (TCC): 704-382-9404
c. For specific entry requirements, refer to Nuclear System Directive (NSD) 502, Corporate
Conduct of Operations in the Switchyard.
6. Immediately prior to accessing the switchyard, employees shall notify the Transmission
Control Center (TCC) at 704-382-9404 or by using one of the direct-link phones located at
the access gate. The TCC must also be called when you leave.
7. Upon entry, employees must consider all conductors and equipment as energized until
checked for voltage and grounded (where applicable).
8. Employees shall lock (re-lock) switchyard entrances that are not observed and controlled by
an attendant.
9. If not in place, employees shall ensure KEEP OUT signs (or the equivalent) are posted at
access gates to warn unauthorized persons.
10. Employees shall report to supervision, the WCC SRO, or to the Site Switchyard Coordinator
any unusual conditions observed on switchyard structures, equipment, ground wires,
busses, and wiring.
11. Unless it is an emergency, obtain permission from the system coordinator or other
authorized persons before energizing or de-energizing a substation, the equipment in the
substation, and the associated lines or busses.
12. When installing or removing grounding devices wear electrical rubber gloves with leather
protectors, eye protection, and hard hats. For circuits or equipment > 400 V, wear arc-rated
flame-resistant clothing. For specific guidance, reference Section 8, Grounding.
a. Before applying grounds, de-energize static capacitors for 5 minutes (where
applicable).
b. Before installing, inspect grounding cables and connecting clamps to ensure:
•
all connections are solid
•
wires or conductors are not frayed or corroded.
Note: If energy sources are de-energized according to NGD tagout procedures, Kearney
vise-grip temporary grounding sets are acceptable to control static or induced
voltage, or when used per the manufacturer’s specified amperage ratings.
13. When grounding lines and equipment for the protection of employees ensure grounding
leads are:
•
not less than 2 / 0 flexible stranded copper rubber-covered cable or its equivalent
•
capable of conducting the maximum fault current potential and duration necessary to
clear the fault.
NSWP 10.0-51
NSWP 10.0
Revision 2
July 1, 2011
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14. When installing grounding cables or materials follow established procedures. Make the
ground connection before taking the ground connection to the equipment or conductor.
15. When removing grounding cables or materials, disconnect the connection to the conductor
or equipment first, and then remove the ground-end connection.
16. Only employees skilled and qualified to perform electrical work are permitted to perform
switching operations.
17. For tagging purposes, see Nuclear System Directive (NSD) 500, “Red Tags / Configuration
Control Tags”.
18. Keep in place locks provided for switching devices and controls.
19. To prevent inadvertent contact, provide guarding around live parts over 150 volts to-ground
that do not have an insulating cover, unless the location of the part gives sufficient horizontal
or vertical clearance to minimize the possibility of accidental employee contact.
20. Carry or place conductive material so as to prevent it from approaching or passing beyond
the “MINIMUM APPROACH DISTANCE” specified within Section 1 and possibly contacting
energized overhead lines, equipment, or busses.
21. Use red danger rope or plastic chain with proper signage to designate energized areas next
to work areas.
22. If climbing or working at heights, attach red danger rope or plastic chain with proper signage
to designate safe heights on structures, columns, or poles above which employees may not
climb because of energized equipment or circuits. The T&D and Power Delivery Groups
may continue to use red flags.
23. Attach fall protection only to designated substantial anchorage points; do not attach to
conductors or cables.
24. Do not use portable metal or other conductive ladders inside the switchyard.
25. Employees shall consider that nuisance voltages impressed or induced on large metal
objects and other miscellaneous conductive material can be present within the switchyard.
a. Do not use metallic cloth tapes, metal tapes, metal rules, or other conductive
material near energized conductors or equipment.
b. Do not string wires, pull computer cable, or install temporary phone lines without
considering approximate voltage present and if such material should be grounded.
c. If sections of the perimeter fence must be repaired, altered, or removed, ensure the
fence is continuously grounded and that continuity across openings is maintained to
eliminate voltage differences between adjacent parts of the fence.
NSWP 10.0-52
NSWP 10.0
Revision 2
July 1, 2011
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26. Due to voltage levels present, operate vehicles, mobile equipment, boom trucks, or cranes
so that the following minimum clearance is maintained between exposed energized lines or
other electrical source and any part of the mechanical equipment (or load).
a.
b.
Operation near high-voltage power lines:
Nominal Voltage, kV - Phase-to-Phase
To 50 kV
Minimum Required Clearance
10 ft. 0 in.
Over 50 kV to 200 kV
15 ft. 0 in.
Over 200 kV to 350 kV
20 ft. 0 in.
Over 350 kV to 500 kV
25 ft. 0 in.
Over 500 kV to 750 kV
35 ft. 0 in.
Operation in transit with no load and boom mast lowered:
Nominal Voltage, kV - Phase-to-Phase
To 0.75 kV (750 V)
Minimum Required Clearance
4 ft. 0 in.
Over 0.75 kV to 50 kV
6 ft. 0 in.
Over 50 kV to 345 kV
10 ft. 0 in.
Over 345 kV to 750 kV
16 ft. 0 in.
27. For routine operation of forklifts or vehicles within the switchyard (e.g., OPS surveillance or
“rounds”), employees should not drive off paved roadways or designated vehicle paths. Due
to the depth of washed stone (gravel), vehicles may easily become stuck.
28. Operation of any lift device or backing operation of any vehicle larger than ¾ ton within 25
feet of energized equipment or supporting structures inside the switchyard boundary will be
required to have an observer or “spotter” to direct movement.
29. Ground all mobile cranes and derricks and other mobile and mechanical equipment
operated near energized lines per Section 8, Grounding.
30. Use the following personal protective equipment, as required, for specific activities within the
switchyard. For additional guidance, refer to Section 7, Electrical Protective Equipment and
Tools.
•
Safety glasses
•
Electrical rubber gloves with leather protectors
•
Face shields
•
Wide-brim, Class B or Class E hard hats with chin straps for switching operations
•
Arc-rated flame resistant clothing for specific situations
NSWP 10.0-53
NSWP 10.0
Revision 2
July 1, 2011
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31. For specific work practices and PPE requirements for switchgear, load center and MCCrelated work activities within the switchyard, refer to Section 4, Switchgear, Load Centers,
and Motor Control Centers.
Section 6.
Transformer Yard Areas
1. Before performing work activities within transformer yard areas, ensure individuals have
demonstrated appropriate knowledge and skills. Electrical workers who perform switching
operations or perform work on load centers and power apparatus cabinets within the
transformer yard shall be trained in the safe work practices, technical skills, and other
personnel safety requirements that pertain to their respective job assignment.
Note: No through traffic is allowed in the transformer yard(s). Excluding those assigned or
approved to enter by Operations and/or the Work Control Center, all other
employees must contact the WCC prior to entry.
2. Only employees skilled and qualified to perform electrical work or specific job tasks are
permitted to work on or work near exposed energized electrical parts or equipment within
transformer yard areas.
3. All other employees (e.g., mechanics, painters, observers, etc.) who must access the
transformer yard shall stay a minimum of 10 feet away from exposed energized electrical
equipment unless there is a work-related need to enter an established safe work boundary /
arc flash boundary. Based on actual exposed voltage levels of associated overhead lines,
230 kV requires a 16 ft. clearance; 525 kV requires a 26 ft. clearance.
4. In transformer yard pre-job briefings, include the location of energized equipment in or
adjacent to the work area.
5. Upon entry, employees must consider all conductors and equipment as energized until
checked for voltage and grounded (where applicable).
6. Employees shall report to supervision, the WCC SRO, or to the Site Switchyard Coordinator
any unusual conditions observed on transformer yard area structures, equipment, ground
wires, busses, and wiring.
7. When installing or removing grounding devices wear electrical rubber gloves with leather
protectors, eye protection, and hard hats. For circuits or equipment > 400 V, wear arc-rated
flame-resistant clothing. For specific guidance, reference Section 8, Grounding.
a. Before applying grounds, de-energize static capacitors for 5 minutes (where
applicable).
b. Before installing, inspect grounding cables and connecting clamps to ensure:
•
all connections are solid
•
wires or conductors are not frayed or corroded.
Note: If energy sources are de-energized according to NGD tag out procedures, Kearney
vise-grip temporary grounding sets are acceptable to control static or induced
voltage, or when used per the manufacturer’s specified amperage ratings.
NSWP 10.0-54
NSWP 10.0
Revision 2
July 1, 2011
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8. When grounding lines and equipment for the protection of employees ensure grounding
leads are:
•
•
not less than 2 / 0 flexible stranded copper rubber-covered cable or its equivalent
capable of conducting the maximum fault current potential and duration necessary to
clear the fault.
9. When installing grounding cables or materials follow established procedures. Make the
ground connection before taking the ground connection to the equipment or conductor.
10. When removing grounding cables or materials, disconnect the connection to the conductor
or equipment first, and then remove the ground-end connection.
11. Only employees skilled and qualified to perform electrical work or specific job tasks are
permitted to perform switching operations.
12. For tagging purposes, see Nuclear System Directive (NSD) 500, “Red Tags / Configuration
Control Tags”.
13. Keep in place locks provided for switching devices and controls.
14. To prevent inadvertent contact, provide guarding around live parts over 150 volts to-ground
that do not have an insulating cover, unless the location of the part gives sufficient horizontal
or vertical clearance to minimize the possibility of accidental employee contact.
15. Carry or place conductive material so as to prevent it from approaching or passing beyond
the “MINIMUM APPROACH DISTANCE” specified within Section 1 and possibly contacting
energized overhead lines, equipment, or busses.
16. Use red danger rope or plastic chain with proper signage to designate energized areas next
to work areas.
17. If climbing or working at heights, attach fall protection only to designated substantial
anchorage points; do not attach to conductors or cables.
18. Attach fall protection only to designated substantial anchorage points; do not attach to
conductors or cables.
19. Do not use portable metal or other conductive ladders inside transformer yard areas.
20. Employees shall consider that nuisance voltages impressed or induced on large metal
objects and other miscellaneous conductive material can be present within the transformer
yard.
a. Do not use metallic cloth tapes, metal tapes, metal rules, or other conductive material
near energized conductors or equipment.
b. Do not string wires, pull computer cable, or install temporary phone lines without
considering approximate voltage present and if such material should be grounded.
c. Where applicable, if sections of the perimeter fence must be repaired, altered, or
removed, ensure the fence is continuously grounded and that continuity across openings
is maintained to eliminate voltage differences between adjacent parts of the fence.
NSWP 10.0-55
NSWP 10.0
Revision 2
July 1, 2011
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21. Due to voltage levels present, operate vehicles, mobile equipment, boom trucks, or cranes
so that the following minimum clearance is maintained between exposed energized lines
or other electrical source and any part of the mechanical equipment (or load).
a.
b.
Operation near high-voltage power lines:
Nominal Voltage, kV - Phase-to-Phase
To 50 kV
Minimum Required Clearance
10 ft. 0 in.
Over 50 kV to 200 kV
15 ft. 0 in.
Over 200 kV to 350 kV
20 ft. 0 in.
Over 350 kV to 500 kV
25 ft. 0 in.
Over 500 kV to 750 kV
35 ft. 0 in.
Operation in transit with no load and boom mast lowered:
Nominal Voltage, kV - Phase-to-Phase
To 0.75 kV (750 V)
Minimum Required Clearance
4 ft. 0 in.
Over 0.75 kV to 50 kV
6 ft. 0 in.
Over 50 kV to 345 kV
10 ft. 0 in.
Over 345 kV to 750 kV
16 ft. 0 in.
22. Unless paved roadways or designated vehicle paths are provided (e.g., grating, steel plate,
etc.) routine operation of forklifts or vehicles is not permitted in transformer yard areas. Due
to the depth of washed stone (gravel), vehicles may easily become stuck.
23. Operation of any lift device or backing operation of any vehicle larger than ¾ ton within 25
feet of energized equipment or supporting structures inside the transformer yard area
boundary will be required to have an observer or “spotter” to direct movement.
24. Ground all mobile cranes and derricks and other mobile and mechanical equipment
operated near energized lines per Section 8, Grounding.
25. Use the following personal protective equipment, as required, for specific activities within
transformer yard areas. For additional guidance, see Section 7, Electrical Protective
Equipment and Tools.
•
Safety glasses
•
Electrical rubber gloves with leather protectors
•
Face shields
•
Wide-brim, Class B or Class E hard hats with chin straps for switching operations
•
Arc-rated flame resistant clothing for specific situations.
NSWP 10.0-56
NSWP 10.0
Revision 2
July 1, 2011
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26. For specific work practices and PPE requirements for switchgear-related work activities
within transformer yard areas, refer to Section 4, Switchgear, Load Centers, and Motor
Control Centers.
Section 7.
Electrical Protective Equipment and Tools
General Personal Protective Equipment Guidance
1. When working on or working near energized circuits, skilled and qualified electrical
workers shall protect themselves from electrical shock or burn by properly using electrical
protective equipment. Skilled and qualified employees shall use electrical protective
equipment only for its intended purpose.
2. Use rubber insulating electrical protective equipment only up to the voltage approved as
shown below. Electrical protective equipment includes insulating mats, blankets, covers,
line hose, gloves and sleeves.
•
Class 0 -- 1,000 volts
•
Class 1 -- 7,500 volts
•
Class 2 -- 17,000 volts
•
Class 3 -- 26,500 volts
•
Class 4 -- 36,000 volts.
3. Before each use, carefully inspect electrical protective equipment. If there is any doubt as to
the equipment’s integrity DO NOT USE IT!!!
4. Immediately following any incident that could have caused damage, re-inspect electrical
protective equipment. Replace or return damaged electrical protective equipment to the
point of issue, (e.g., return damaged items to Tool Issue or the IAE test lab).
5. When electrical protective equipment selection depends on voltage levels, use the phase to
phase voltage on multiphase circuits. Phase to ground voltage may be used if:
•
there is no multiphase exposure, or
•
energized conductors are covered with electrical protective equipment eliminating any
possible multiphase exposure.
6. Take appropriate precautions if work area is wet. Before working on energized equipment,
dry wet floors. If floors cannot be dried, use electrical rubber gloves, insulating mats, and a
wooden foundation to elevate the mat above the moisture.
Inspection Requirements
1. Prior to use, inspect all electrical protective equipment and insulated tools. Specific
inspection requirements can be found in Section 7 of this NSWP.
NSWP 10.0-57
Comment [d1]: Either delete or make this
section match Recommendation from Section 1.
NSWP 10.0
Revision 2
July 1, 2011
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Note: While most vendors report equipment deficiencies related to manufacturing defects
and nuclear plants share operating experience on equipment problems, most
deficiencies are not identified until the equipment or tool actually fails.
2. Do not use rubber electrical protective equipment having any of the following defects:
• holes, tears, punctures, or cuts
• embedded objects
• hard spots or age cracks
• swelling, softening, or hardening
• sticky, inelastic, or other abnormal condition.
3. Immediately remove damaged electrical protective equipment and insulated tools from
service and replace or return to them to Tool Issue or the IAE test lab.
a. A PIP shall be initiated for all recurring equipment or tool deficiencies identified. This
information should be shared with other groups on site and within the nuclear industry.
b. Failure to perform required inspections has been identified by INPO as a significant
contributing factor to electrical shock and employee injury events within the industry.
4. Inspection requirements should be included in the pre-job briefing. The pre-job briefing is an
excellent time to perform inspections on equipment or tools.
5. Verify that voltage testing or indicating devices are operating properly and that appropriate
settings are used for the parameter and type of voltage to be checked. Personal injuries
have occurred as a result of incorrectly set testing devices.
a. Do not exceed the maximum safe voltage for the test equipment. Follow manufacturer’s
guidelines and / or group procedures for specific limitations of equipment used.
b. For specific guidance, reference Section 7, Electrical Protective Equipment and Tools.
Head Protection
1. Hardhats shall be worn whenever there is a danger of contact from electrical shock or burns
due to head contact with exposed, energized equipment or circuits or whenever working on
or working near voltage levels above 300 V (nominal).
2. Where the clearance or the delicate nature of the work cannot be safely carried out while
wearing hard hats, practical measures shall be taken to prevent electrical contact or shock.
a. Examples include, but are not limited to:
•
de-energizing all power to the area where work is being performed
•
installing temporary non-conductive materials (e.g., electrical rubber mats or
blankets) to eliminate exposure to energized equipment.
b. The hard hat should be replaced on the head as soon as the delicate or constricted work
is completed.
3. All hard hats shall have markings to indicate approval per ANSI Z89 (or Z89.1), Class B or
Class E. These markings can be found on a sticker inside the hat, or can be verified from
the manufacturer.
NSWP 10.0-58
NSWP 10.0
Revision 2
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4. Chinstraps should be worn when conditions make it difficult to keep the hard hat on your
head (e.g., climbing, body position, etc.) or when FME (foreign material exclusion) concerns
exist.
5. Do not place metallic stickers, letters, or decals of any type on a hard hat.
6. Wide brim hard hats are required for switching operations (e.g., operating outdoor
disconnect switches from the ground) in the switchyard or transformer yard areas.
7. Do not use paints, solvents, adhesives, or petroleum products on hard hats.
8. Hard hats may be cleaned with a mild soap and water if they become soiled.
9. Do not store your hard hat in direct sunlight, as the ultraviolet rays may cause degradation
of the plastic.
10. Inspect hard hats and suspensions periodically for dents, cracks, penetrations, or other
signs of wear that may indicate a reduction in protection. Replace your hard hat or hard hat
suspension if it is found to be defective.
11. If there is any doubt as to the hard hat’s integrity DO NOT USE IT!!!
Eye and Face Protection
1. Eye protection shall be worn at all times within the plant and / or operating areas of the
station.
2. Face shields and safety glasses shall be worn when, but not limited to:
•
working on plant battery systems
•
performing work where there is possibility of an electrical arc flash
•
working on or working near voltage levels above 400 V (nominal).
a. Select the appropriate face shield for the style hard hat you are using.
b. If all energy sources greater than 400 V are de-energized according to lockout / tagout
procedures AND if safe work conditions have been verified, face shields are not
required.
3. Eye and / or face protection must:
•
provide adequate protection against the hazard(s) for which it is designed
•
be reasonably comfortable when worn under the designated conditions
•
fit snugly and not unduly interfere with movements of the wearer
•
be durable
•
be capable of being disinfected
•
be easily cleaned.
4. Eye and / or face protection must be distinctly marked to facilitate manufacturer
identification.
NSWP 10.0-59
NSWP 10.0
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5. Any limitations or precautions identified by the manufacturer must be clearly communicated
to the user.
6. Face shields commonly used for electrical work involving indirect or relatively low arc flash
exposure (e.g., incident energy levels < 4 cal/cm2) are clear .060” polycarbonate visors.
7. Face shields commonly used for electrical work involving direct exposure or for tasks
having higher potential incident energy levels (e.g., > 4 cal/cm2) are currently made of
tinted polycarbonate or polyproprionate (e.g., Oberon “Arc-X ArcShield" or Salisbury
“Pro-Shield”).
Note: For specific PPE requirements for switchgear, load center, and MCC-related work
activities, reference Section 4, Switchgear, Load Centers, and Motor Control
Centers.
8. Inspect face shields for excessive scratches, dirt, cracks, or other damage that may impair
vision. Replace shields as needed.
9. If there is any doubt as to the equipment’s integrity DO NOT USE IT!!!
10. Maintenance of face shields:
a. Each employee is responsible for the care and maintenance of his / her face shield.
b. Face shields shall not be excessively scratched so as to interfere with vision.
c. Face shields may be washed with a mild soap and wiped dry with a soft cloth when they
become soiled with dirt or other material that distorts vision. Windex® or similar
commercial glass cleaner should not be used because it can smear and distort the
shield’s anti-scratch or anti-fog coating.
d. Face shields should be stored in a clean, dry location where dust and dirt will not collect
to distort vision and / or scratch the lenses.
Electrical Rubber Gloves
1. When working on exposed, energized conductors > 200 volts, wear electrical rubber gloves for
(but not limited to) these tasks:
•
possibility of electrical contact by the hands (i.e., working inside the MINIMUM APPROACH
DISTANCE)
•
operating outdoor disconnect switches from the ground (hookstick or gang-operated)
•
operating outdoor disconnect switches from the ground (hookstick or gang-operated)
•
taking brush load reading on generators
•
removing and replacing potential transformer fuses and lower voltage fuses
•
connecting or removing capacitors at generator buss, circuit breakers cleared for
maintenance
•
transformers cleared for maintenance
•
racking switchgear breakers in / out
NSWP 10.0-60
NSWP 10.0
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•
installing or removing switchgear breakers from cubicles (with no isolation shutter)
•
connection of test equipment or electrical apparatus cleared for maintenance
•
checking of energized circuits
•
connecting or disconnecting any equipment grounding cables
•
meggering motor loads
•
work on electrical circuits that cannot be isolated
•
in training and there is danger to the hands
•
when required by procedure.
2. Ensure the maximum-use voltage for electrical rubber gloves is as follows:
•
Class 0 -- 1,000 volts
•
Class 1 -- 7,500 volts
•
Class 2 -- 17,000 volts
•
Class 3 -- 26,500 volts
•
Class 4 -- 36,000 volts.
3. Visually inspect and air-test electrical rubber gloves before each use. Because the fingers
and the area of the palm between the thumb and forefinger receive the most abuse, these
areas should be checked with extra care.
4. To inspect and physically air test an electrical rubber glove, temporarily remove its leather
protector.
a. Visually inspect the glove and sleeve surface (cuff) area carefully by looking for
irregularities such as:
•
holes, tears, punctures, or cuts
•
embedded objects
•
hard spots or age cracks
•
swelling, softening, or hardening
•
sticky, inelastic, or other abnormal condition.
b. To air test the glove, grasp the cuff of the rubber glove on each side and stretch the cuff
until it lays flat with opposite edges touching each other.
c. While holding the cuff in this position, twirl the glove around its cuff to trap air inside the
glove, inflating its hand and finger areas. (i.e., same as method used for air testing
rubber gloves for RCZ work activities)
d. Grasp the rolled cuff tightly in one hand (not to let any air escape), and hold the glove so
that its hand and finger areas can be placed close to your ear.
NSWP 10.0-61
NSWP 10.0
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e. Any air escaping from the glove will make a hissing noise, which would indicate that the
glove is defective. Do not hurry through this step. Listening is necessary because the
glove may not readily deflate.
f.
If there is any doubt as to the glove’s integrity DO NOT USE IT!!!
5. Wear leather glove protectors over electrical rubber gloves at all times; do not use leather
glove protectors for any other purpose.
a. Class 0 rubber gloves can be used temporarily without leather glove protectors under
limited use conditions where small equipment and parts manipulation require unusually
high finger dexterity.
b. Under these conditions take extra care in the visual examination and air testing of each
glove before use and in avoiding the handling of sharp objects.
c. If Class 0 rubber gloves are used for a specific task without leather glove protectors,
remove the glove(s) from service immediately and return both gloves (the pair) in their
canvas storage bag to the IAE test shop / lab for formal re-inspection and dielectric
testing. DO NOT RE-USE for subsequent tasks.
6. Be sure to use the proper combination of electrical rubber gloves with leather glove
protectors. The cuffs of leather glove protectors must never extend beyond the cuffs of the
electrical rubber gloves.
7. Any electrical rubber glove that has been damaged or found to have other defects that might
affect its insulating properties shall be removed from service and the pair (i.e., both rubber
gloves) shall be placed inside their canvas or nylon storage bag and returned to the IAE test
shop / lab. Label or identify the gloves as being damaged or defective - DO NOT USE.
8. If electrical rubber gloves and sleeves contact oil, grease, or damaging substances, wipe
them clean as soon as possible.
9. Exchange electrical rubber gloves and sleeves for dielectric testing on a 4 month cycle.
Gloves and sleeves will be stamped with a test date and an expiration date. Do not use
rubber gloves and sleeves if the current month exceeds the expiration date (month / year)
stamped on them.
10. If electrical rubber gloves prevent an employee from satisfactorily performing work because
of clearance or the delicate nature of the work, take practical protective measures to prevent
electric shock as follows:
•
remove all or most of the power to the area where the work is performed
•
use insulated tools
•
temporarily install insulating material rated for the voltage to reduce exposure to metallic
surfaces.
11. Avoid folding, creasing, or compressing all rubber electrical protective equipment.
12. Store electrical rubber gloves, sleeves, and protectors in storage bags provided for that
purpose.
13. Store all rubber electrical protective equipment separately in designated areas or equipment
compartments.
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14. When wearing electrical rubber gloves to check for voltage, perform switchgear, load center
or motor control center (MCC) -related work activities, or work on or work near exposed
energized conductors, including station and vehicle batteries, do not wear jewelry (rings,
necklaces, bracelets, earrings, etc.).
15. If needed to perform the work, nonconductive watches (plastic band and face, non-exposed
metal back) are allowed for electrical work when worn under electrical rubber gloves.
Clothing
1. When working on or working near exposed energized electrical equipment > 50 volts,
wear personal outer clothing constructed of natural fibers such as 100% cotton or wool.
•
Do not wear personal outer clothing made from synthetic materials such as nylon, or
polyester and cotton blends unless approved.
•
When wearing100% cotton T-shirts, do not wear shirts with iron-on latex logos or decals
(i.e., heat transfer graphics).
2. When working on or working near exposed energized electrical equipment > 400 V
nominal, wear company-approved arc-rated flame-resistant (FR) clothing.
•
Shirts and pants (personal outer clothing) worn underneath flame-resistant clothing must
be constructed of natural fibers such as 100% cotton or wool.
•
Do not wear personal outer clothing made from synthetics such as polyester and cotton
blends beneath FR clothing.
•
Do not wear damaged arc-rated FR clothing that may have minor burns or holes from
hot slag, sparks or excessive wear.
3. As needed, ensure arc-rated FR clothing is available or staged for use in contaminated work
areas. FR clothing designated for specific use in contaminated work areas (Radiation
Control Zones) shall not be obtained or used in non-contaminated work areas.
4. Prior to, and after, each use, employees shall carefully inspect FR clothing for cuts, tears,
punctures, or any other damage. If any damage is identified, remove the clothing from
service and return it to your supervisor (or point of issue) for replacement.
5. If there is any doubt as to the arc-rated FR clothing’s integrity DO NOT USE IT!!!
6. FR clothing may be machine-washed or dry cleaned, but must be washed separately from
other garments to prevent a contamination of the fabric with flammable lint. Work groups or
employees who purchase or obtain FR coveralls from stock shall refer to manufacturer
recommendations for additional care and cleaning requirements.
Rubber Mats, Blankets, Sheeting and Line Hoses
1. Visually inspect electrical rubber mats or blankets for any flaws or defects before each use.
a. Place mat or blanket on a clean, flat surface and roll tightly starting at one corner and roll
toward the diagonal opposite corner.
b. Inspect the entire surface for irregularities as it is rolled up.
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c. Unroll the mat or blanket and roll it up at right angles to the original direction of rolling.
d. Repeat the inspection and rolling process on the reverse side.
e. If there is any doubt as to the mat’s or blanket’s integrity DO NOT USE IT!!!
2. Electrical rubber mats or blankets shall be exchanged or returned to the IAE test lab for
dielectric testing on a 12 month cycle. Rubber mats or blankets will be stamped with a test
date and an expiration date. Do not use rubber mats or blankets if the current month
exceeds the expiration date (month / year) stamped on them.
3. When electrical rubber sheeting is used for electrical insulation, the following are required:
•
do not use on overhead lines, underground installations, in substations, or switchyards
•
use only on equipment 600 V or less regardless of any rating stamped or marked on the
sheeting
•
install by skilled and qualified electrical workers only
•
wear electrical gloves with leather protectors, hard hat, and safety glasses when
installing the rubber sheeting and when working in a panel or enclosure that has
energized parts which are already covered by rubber sheeting
•
inspect before and after each use
•
discard all material when more than one year has passed since manufacturer’s or the
last dielectric test (date should be stamped or may be marked on rubber sheeting).
4. Avoid folding, creasing, or compressing all rubber electrical protective equipment.
5. Store all rubber electrical protective equipment separately in designated equipment
compartments.
6. Loosely roll mats or blankets for storage.
7. Do not fold line hoses. Line hoses shall receive dielectric testing every 12 months.
Tools for Electrical Work
1. Insulated hand tools are approved for use on exposed energized equipment up to 1000
volts. If there is any chance that hand tools will make contact with an energized source, use
only tools marked with the official international 1000-volt rating symbol as shown below.
Note: The Auxiliary Building tool room maintains a supply of insulated tools for use in
contaminated areas.
2. To reduce the risk of injury due to shock or burns, or potential electrical hazards due to
failure of equipment, use insulated tools only for their designed purpose.
3. Do not touch the non-insulated portion of a tool or any conductive object when either might
contact an energized source.
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4. Do not use insulated tools on circuits over 1000 V. At higher voltages, the insulation could
be damaged, increasing the risk of injury during subsequent use. Use live line tools (e.g.,
shotgun sticks, operating sticks, telepoles) rated for the voltage where appropriate.
5. Keep insulated tools in good condition with regular maintenance and inspection.
a. Because moisture, films, or other surface contaminants are conductive, insulated tools
must be kept clean, dry and free of any surface contaminants.
b. Before using insulated tools, visually inspect them to ensure the insulating material is not
damaged (e.g., melted, cut, torn or broken). If there is any doubt as to the tool’s integrity
DO NOT USE IT!!!
c. As necessary, examine each tool after use for possible damage before placing it back
into your tool bag or storage drawer.
d. Refer to manufacturer’s guidelines for replacement specifications. For example, Klein
Tools® warning information states: “Do not use if orange coating cracks, breaks or
becomes damaged. Destroy tool if white layer shows through orange layer.”
6. Store insulated tools to prevent unnecessary damage or degradation. Do not permit other
tools or heavy objects to be thrown onto the tools, possibly cutting or damaging the
insulation.
7. If damaged tools are identified or if any insulated tool is found to have other defects that
might affect its insulating properties, remove the tools from service.
•
Return them to your supervisor (or point of issue) for replacement.
•
Label or identify the tools as being damaged or defective - DO NOT USE.
8. If approved insulated tools do not exist or if acceptable tools are not manufactured for
specific applications, supervisors shall contact site EHS for guidance.
a. A PIP shall be initiated for all generic equipment or tool deficiencies identified.
•
This information should be shared within the industry to document and establish
resolution for each general concern.
•
Manufacturers or distributors shall be contacted to determine if approved insulated
tools can be developed.
b. Until resolved, each situation must be reviewed on a case-by-case basis to determine
appropriate safe work practices required. Where necessary, Group management shall
review interim measures established.
c. Per the “MINIMUM APPROACH DISTANCE” table of Section 1, Working On or Working
Near Exposed Energized Conductors and Equipment, even where standard tools could
be rendered nonconductive by covering, wrapping, or other insulating means, only use
approved insulated tools near energized circuits. Never use standard tools that have
been wrapped or covered on or near an exposed or potentially hazardous energized
conductor or circuit part.
9. Visually inspect live line tools and wipe them clean prior to use each day.
10. Do not put live line tools on the ground.
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11. Electrically test live line tools at least every two years. (Testing frequencies vary by
equipment and manufacturer.)
12. Inspect, clean, and properly wax (or wipe with silicon, depending on the manufacturer) all
live line tools as needed.
13. Immediately remove damaged live line tools from service and retest before returning them to
service.
Note: When using cleaned, waxed (and wiped) telepoles to do minor switching activities,
wearing gloves is not required.
14. Do not use telepoles for:
•
installing or removing live line clamps
•
closing blade disconnects
•
substation switching.
15. Use telepoles only when positive control can be achieved.
16. Prior to use, visually inspect test instruments or equipment and the following for external
damage. If there is any doubt as to the equipment’s integrity DO NOT USE IT!!!
•
all associated test leads
•
cables
•
power cords
•
probes
•
connectors.
17. Verify that voltage testing or indicating devices are operating properly and that appropriate
settings are used for the parameter and type of voltage to be checked. Personal injuries
have occurred as a result of incorrectly set testing devices.
a. As a general rule, testing devices are not calibrated. Calibrated instrumentation is
required only when the data must be recorded.
b. Do not exceed the maximum safe voltage for the test equipment. Follow manufacturer’s
guidelines and / or group procedures for specific limitations of equipment used.
c. Verify that the testing device is being used for the correct application and in the proper
configuration. Follow the instructions in the Operator’s Manual for the specific make and
model being used.
18. Use test equipment to test the circuit elements and electrical parts of equipment to which
employees will be exposed to verify that they are de-energized. If the circuit to be tested is
> 50 volts, nominal, voltage testing equipment and / or indicating devices shall be checked
for proper operation immediately before and immediately after this test.
19. Do not throw tools and material from the ground to employees working aloft.
20. Do not throw or intentionally drop tools and material from above to the ground.
21. Do not let tools or materials drop or fall.
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22. Raise and lower all lightweight equipment using a hand line, canvas bucket, or other
suitable means.
23. Where it is necessary to prevent hazards to employees or to equipment or material, use tag
lines to control loads being hoisted.
24. Use nonconductive tag lines, measuring tapes, and hand lines near energized lines and
equipment.
25. When working around water or other conductive liquids, use one of the following:
•
only portable electrical equipment and extension cords approved for these locations
•
ground fault circuit interrupters (GFCI’s).
Section 8.
Grounding
1. Per Duke Energy electrical safe work practices, employees shall consider lines and
equipment as energized until they have been isolated, checked for voltage (i.e., a zero
energy check) and grounded (where applicable). De-energized equipment shall be
intentionally grounded to provide employee protection under each of the following
circumstances:
•
on “transmission and distribution” electrical systems where requirements of lockout
/ tag-out procedures per NSD 500, Red Tags / Configuration Control Tags cannot
be applied to isolate hazardous energy sources and tag, block or lock energyisolating devices
•
where the possibility of induced voltage or stored electrical energy exists that might
endanger personnel
•
where it could be reasonably anticipated that conductors or circuit parts being deenergized could contact other exposed energized conductors or circuit parts.
2. Only employees skilled and qualified to perform electrical work or specific job tasks are
permitted to work on or work near exposed energized electrical equipment or perform work
activities that involve electrical equipment grounding.
3. Before performing work activities that involves the installation or removal of grounding
devices, ensure individuals have demonstrated appropriate knowledge and skills. Electrical
workers who perform grounding of lines and equipment shall be trained in the safe work
practices, technical skills, and other personnel safety requirements that pertain to their
respective job assignment.
Note: Face shields are not required when installing or removing ground lines and
equipment.
4.
When installing or removing grounding devices wear electrical rubber gloves with leather
protectors, eye protection, and hard hats. For circuits or equipment > 400 V, wear arcrated flame-resistant clothing.
a. If the equipment has been de-energized per NSD 500, absence of voltage has been
verified (with a voltage testing and / or indicating device), and grounding is not part of
the tagout isolation boundary, standard arc-rated FR coveralls or FR shirt and pants
may be worn when installing or removing grounds.
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b. Before applying grounds, de-energize static capacitors for 5 minutes (where
applicable).
c. Before installing, inspect grounding cables and connecting clamps to ensure all
connections are solid wires or conductors are not frayed or corroded.
Note: If energy sources are de-energized according to NGD tag out procedures, Kearney
vise-grip temporary grounding sets are acceptable to control static or induced
voltage, or when used per the manufacturer’s specified amperage ratings.
5. When grounding lines and equipment for the protection of employees ensure grounding
leads are:
•
not less than 2 / 0 flexible stranded copper rubber-covered cable or its equivalent
•
capable of conducting the maximum fault current potential and duration necessary to
clear the fault.
6. When installing grounding cables or materials follow established procedures. Make the
ground connection before taking the ground connection to the equipment or conductor.
7. When removing grounding cables or materials, disconnect the connection to the conductor
or equipment first, and then remove the ground-end connection.
Note: Lethal static voltage can exist on ungrounded de-energized lines.
8. Before doing any work, ground de-energized lines or equipment (where applicable).
9. Before installing grounds on a supposedly de-energized circuit, visually inspect the
grounding equipment.
10. To determine whether the circuit has actually been de-energized, use approved testing
devices to check for voltage on the conductors to be grounded. Ensure voltage checks are
considered for residual or static voltage that may be present.
11. When temporarily removing grounds during tests, treat the lines, circuits or equipment as
energized whenever the grounds are removed.
12. For proper placement of grounding equipment, refer to department or procedural guidance.
13. Before clearing trees during emergency conditions, ground de-energized lines and
equipment.
Grounding Mobile and Mechanical Equipment
1. For specific guidance regarding work activities involving electric transmission and
distribution systems, reference the Duke Energy Safe Work Practices Manual, “Electrical
Safety For Transmission and Distribution” category.
2. When working in close proximity to overhead energized circuits or circuits that may become
energized, ground the metal parts of all line trucks, aerial baskets, mobile cranes, hole
diggers, portable transformers, trailers, reel stations, and similar equipment.
•
When working on lighting fixtures where no primary conductors are attached or
within reach of the bucket or boom, grounding the vehicle is not required.
•
All other work requires the vehicle to be grounded.
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3. Operate mobile equipment, boom trucks, or cranes so that the following minimum
clearance is maintained between exposed overhead energized lines or other electrical
source and any part of the mechanical equipment (or load).
a.
b.
Operation near high-voltage power lines:
Nominal Voltage, kV - Phase-to-Phase
To 50 kV
Minimum Required Clearance
10 ft. 0 in.
Over 50 kV to 200 kV
15 ft. 0 in.
Over 200 kV to 350 kV
20 ft. 0 in.
Over 350 kV to 500 kV
25 ft. 0 in.
Over 500 kV to 750 kV
35 ft. 0 in.
Operation in transit with no load and boom mast lowered:
Nominal Voltage, kV - Phase-to-Phase
To 0.75 kV (750 V)
Minimum Required Clearance
4 ft. 0 in.
Over 0.75 kV to 50 kV
6 ft. 0 in.
Over 50 kV to 345 kV
10 ft. 0 in.
Over 345 kV to 750 kV
16 ft. 0 in.
4. Ground mobile equipment before raising boom, crane mast, hoist, or equivalent into the
vicinity of overhead energized lines or electrical equipment, or in the vicinity of overhead deenergized lines or equipment that could become energized.
5. Before the installation or use of any mobile equipment ground, ensure that the end of the
ground cable is connected to a suitable ground plate or stud on the vehicle.
Note: Common neutral refers to the system neutral when installed at the secondary level.
6. Use the common neutral on distribution circuits as the ground source. When the common
neutral is not available, install the grounding cable to one of the following attachment points
in the order listed.
a.
Substation ground system.
b.
Tower ground footing.
c.
Copper pole ground (preferable bonded to neutral).
d.
Anchor rod.
e.
Driven ground rod installed to a depth of 48 in. or maximum achievable penetration.
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7. Select one of the following 3 approved methods for attaching mobile equipment grounds to
common neutrals on lines 33 KV and below:
Note: For transmission voltages, reference Electric Transmission Grounding Procedures.
a. Live-Line Tool From Aerial Device
Wearing personal protective equipment, elevate the bucket to a position
approximately 8 ft. from the common neutral. Then attach the equipment ground to
the common neutral with an eight-foot live-line tool.
b. Gloved Hand From Aerial Bucket
To install a vehicle ground on an open-wire, secondary neutral or secondary triplex cable
neutral, do the following in the order listed:
i.
Install a temporary ground to one of the following attachment points in the order
listed:
•
Substation system ground
•
Tower footing
•
Copper pole ground (preferably bonded to neutral)
•
Anchor rod or driven ground rod.
Note: Two pieces of equipment cannot be grounded to the same driven rod.
ii.
Identify the common neutral.
iii.
Attach the ground to the common neutral using a Class 2 or higher insulatedgloved hand.
c. Gloved Hand From Pole Position
Wearing personal protective equipment, climb the immediate pole adjacent to the
mobile equipment and attach the equipment ground to the neutral using Class 2 or
higher gloved hands.
8. Upon job completion, remove grounding devises only after the aerial device, crane or derrick
boom, or similar parts of the equipment have been removed from the vicinity of the
overhead energized conductors or equipment. The removal sequence of the equipment
ground must be completed in reverse order as outlined in each installation method in item 7
above.
9. Remove the ground with the gloved hand (no live-line tool) only if the equipment will not be
exposed to energized conductors.
10. When grounding portable transformer trailers, affix the grounding device to a proper ground
before the transformers are energized. Do not remove the grounds until the transformers
have been de-energized and all possible danger of contact has been eliminated.
Inspection, Care, and Storage of Grounding Equipment
1. Use correctly sized ground leads.
2. Use the cable jacket for mechanical protection of the conductor only.
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3. If used in work activities involving Electric Distribution, ensure equipment grounds are tested
annually.
4. Before each use, visually inspect ground assembly and ensure that:
•
cables are continuous without any broken or damaged strands
•
insulation has not been nicked, damaged, or cut
•
cable does not have flat spots (flat spots may indicate deterioration under the jacket of
the cable)
•
cable ferrules are installed and cable lugs are properly torqued
•
heat shrink covers are installed and are in good condition on both cable ends
•
cable clamps are not damaged
•
cable is properly torqued in clamp with ferrule on cable.
5. Do not install tape on cuts or insulation damage.
6. After each use, visually inspect ground assembly for damage and do the following:
•
wipe clean the ground assembly
•
coil the cable neatly, beginning the coiling procedure from the same end of the cable
each time (if possible) to avoid kinking the cable
•
store cable to prevent damage.
Section 9.
Assured Electrical Equipment Grounding (Use of
Tools and Extension Cords)
Note: Test requirements of the assured equipment grounding program do not apply to
extension cords (cord sets), equipment or appliances used in support of office work
activities, labs, training facilities, the motor pool, or for administrative areas
established within the plant. Flexible cords and cables with a designated use of
camera, computer, telephone, television, or thermostat wiring also do not apply to
requirements of this safe work practice.
Assured Electrical Equipment Grounding / Testing
1. Assured electrical equipment grounding applies to the following when used in construction,
remodeling, maintenance, repair, or demolition of buildings, structures, equipment, or similar
activities. Examples include:
•
extension cords or cord sets
•
receptacles which are not a part of the building or structure
•
cord- and plug-connected tools
•
cord sets or equipment with Ground Fault Circuit Interrupters (GFCI).
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2. Requirements of the assured equipment grounding testing program do not apply to
equipment, extension cords or cord sets:
•
routinely used in administrative or office areas
•
routinely used in laboratories, warehouses, training facilities or the motor pool
•
used in plant operating areas by groups such as Chemistry, OPS or RP as a power
supply for monitoring and test equipment
•
such as office equipment (e.g., calculators, computers, appliances)
•
if equipment is supplied directly through permanent wiring.
Note: Extension cords or cord sets with a GCM (ground continuity monitor) plug and
double insulated tools do not require quarterly or semi-annual testing. Quarterly or
semi-annual testing is also not required for GFCI extension cords and cord sets
where sites perform a “wholesale” change-out, converting to all in-line GFCI
extension cords for use during construction, maintenance, demolition, or similar
activities.
3. The following tests shall be performed using a Multi-Amp Power R-Safe (or equivalent tool)
on all extension cords or cord sets, receptacles, and cord- and plug-connected tools and
equipment not exempted in item 2.0 above.
•
All equipment grounding conductors shall be tested for continuity and shall be electrically
continuous.
•
Each receptacle and attachment cap or plug shall be tested for correct attachment of the
equipment grounding conductor. The equipment grounding conductor shall be
connected to its proper terminal.
4. Designated tool issue personnel shall perform all required testing:
•
before first use
•
before equipment is returned to service following any repairs
•
before equipment is used after any incident which can be reasonably suspected to have
caused damage (such as a cord set being cut after being run over by a vehicle or
pinched in a door)
•
at intervals not exceeding 3 months (except for cord sets and receptacles which are
fixed and not exposed to damage shall be tested at intervals not exceeding 6 months).
5. If there is a defect or evidence of damage that may expose employees to injury, the
defective or damaged item shall be removed from service and not used until it has been
repaired or replaced.
6. At each nuclear location, color coding (tape):
•
identifies each receptacle, cord set, and cord- and plug-connected equipment that
passed the test
•
indicates the last quarter it was tested or the interval for which it was tested.
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7. The color code (tape) shall be maintained until replaced by a more current color code.
8. The following colored tape shall be used on the equipment to indicate the last test date as
follows:
•
For items tested quarterly:
FIRST QUARTER
SECOND QUARTER
THIRD QUARTER
FOURTH QUARTER
•
RED
WHITE
YELLOW
BLUE
For items tested every six months:
JANUARY – JUNE
JULY - DECEMBER
ORANGE
GREEN
9. Do not use metallic tape for color-coding.
Guidelines for the Safe Use of Equipment
1. Electrical tools and equipment shall be checked before use each day to ensure that there
are no visible safety defects. If defects are identified, the equipment shall be removed from
service and returned to Tool Issue to be repaired by a designated individual or destroyed.
2. Extension cords shall be used for temporary conditions only. Extension cords or flexible
cords or cable shall not be used to provide continuous power to stationary equipment
unless:
•
they are used for the connection of pendant wiring or fixtures, portable lamps, signs or
appliances
•
flexibility is necessary for equipment such as elevator cables or wiring of cranes or hoists
•
prevention of the transmission of noise or vibration is required (in some cases vibration
might fatigue fixed wiring and result in a situation more hazardous than flexible cord)
•
by design, the connection of appliances or equipment must be capable of being readily
removed to allow maintenance, substitution, or repair.
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Uses Permitted For Flexible Cord
3. When required for temporary conditions or as necessary for specific applications permitted
in Section 2.0, extension cords or flexible cords and cable not installed under site temporary
power procedures shall be equipped with an attachment plug and energized from an
approved receptacle:
Note: When required for permanent applications, install approved surface-wiring rather
than using extension cords improperly.
4. Extension cords or flexible cords shall not be used as a substitute for fixed utilization wiring
(non-power generation, transmission or distribution related wiring) within the plant or other
commercial buildings. Unless required for temporary conditions or necessary for specific
applications permitted in Section 2.0, extension cords or flexible cords shall not be:
•
used as a substitute for the fixed wiring of a structure
•
run through holes in walls, structural ceilings, suspended ceilings, floors or windows
•
concealed behind walls, structural ceilings, dropped ceilings, or floors
•
permanently attached to building surfaces.
Prohibited Uses of Flexible Cord
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5. Extension cords and temporary power outlets that are not equipped with a ground fault
circuit interrupter (GFCI) or a ground continuity monitor (GCM) shall not be used during
activities involving construction, remodeling, maintenance, repair or demolition unless tested
and color-coded in accordance with the assured equipment grounding testing program
described previously under the reference to the assured grounding equipment testing
process.
Note: Often, a work group or team retains possession of materials and equipment rather
than obtaining them (as needed) from the tool room. In these cases, it shall be the
responsibility of those groups (or teams) to ensure that the equipment is taken to the
tool issue station for testing or repair.
6. Extension cords, cord sets and cord- and plug-connected tools shall be visually inspected
before use each day for external defects (e.g., loose parts, deformed or missing pins, and
insulation damage) and for indications of possible internal damage (e.g., flattened or
crimped areas, or areas with insulation damage).
7. With the exception of equipment exempted per this Section all applicable tools and
equipment shall be checked to ensure periodic testing has been performed in accordance
with the assured equipment grounding testing program.
a. If you cannot locate the colored tape, or if the tape indicates the wrong color for the
current quarter (i.e., 1st-Red, 2nd-White, 3rd-Yellow, 4th-Blue), return the equipment to
Tool Issue.
b. Do not use the tool or equipment until it has been replaced by a more current color code.
8. Ground conductors (as used on three-prong plugs) shall remain intact and in use with all
extension cords.
9. Adapters or isolation plugs that interrupt the continuity of the equipment ground conductor
shall not be used.
10. Ensure extension cords and cord sets are rated and UL (Underwriter Laboratory) or FM
(Factory Mutual) listed for the intended application (e.g., indoors or outdoors, heavy duty or
light duty, etc.)
Note: To determine the specified amperage rating needed when selecting an extension
cord, add up the total number of watts for each electrical device or appliance to be
used and divide by 110 (i.e., voltage). To determine total wattage, if your appliance
indicates that it uses 5 amps at 120 volts, then its wattage rating is 600W (5 x 120 =
600).
a. To avoid overheating, do not exceed the specified amperage or total wattage rating
marked on the extension cord or plug. Individual users must consider the total number
of watts of tools or appliances plugged into the cord.
b. Use extension cords sized for the amount of current flow required. For example, a
heavy duty 14 / 3 (14 gauge, 3 conductor grounded) extension cord, commonly available
from tool issue, is the minimum size recommended for construction or maintenance
activities.
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c. If extension cords must be connected together, ensure the total cord distance does not
affect the specified amperage rating needed. For example, the amount of current that
can be carried through a heavy duty (15 amp) extension cord will usually be less as the
cord length gets longer. Typically, a heavy duty extension cord at:
•
100 feet – can carry only 13 amps
•
250 feet – can carry only 7 amps.
11. Do not raise and / or lower tools or equipment with extension cords connected to the
equipment or use extension cords as a substitute for rope when a hand line, tool bag or
ladder bag may be needed.
12. Extension cords shall not be fastened with staples, clamps, or otherwise hung in such a
fashion that could damage the outer jacket, insulation, or conductors.
13. Locking type connectors shall be properly secured after connection, if applicable.
14. Hands must be dry when plugging and unplugging cords if energized equipment is involved.
15. If an extension cord, cord set, or cord- and plug-connected tool is wet from being immersed
in liquid, it shall be handled with protective equipment if it is still energized or if the state is
unknown. It shall not be used again until it has been dried out and tested to show no
problems.
16. Ensure that cord- and plug connected equipment used in damp or wet locations are one of
the following:
•
grounded
•
double-insulated
•
supplied through an isolating transformer with an underground secondary not over 50
volts.
Note: When using portable GFCIs, install the GFCI between the receptacle and the cord
set, not between the tool and the cord set.
17. Ensure that cord- and plug-connected equipment or extension cords used in highly
conductive locations are:
•
approved for use in those locations
•
used with Ground Fault Circuit Interrupter protection in damp or wet locations.
18. When performing activities that could cause fixed electrical equipment to get wet, cover the
equipment (e.g., wetting down areas for asbestos abatement).
Note: When using portable GFCIs, install the GFCI between the receptacle and the cord
set, not between the tool and the cord set.
19. In confined spaces, use electrically powered lights and tools that are one of the following:
•
low voltage
•
protected with Ground Fault Circuit Interrupters (GFCI).
NSWP 10.0-76
NSWP 10.0
Revision 2
July 1, 2011
VERIFY HARD COPY AGAINST WEB SITE IMMEDIATELY PRIOR TO USE
20. Identify, cover, or mark all temporary cables or extension cords passing through work areas
that could create a trip hazard. Employees shall eliminate tripping hazards or restrict access
to the area.
a. When possible, elevate cables and cords passing through work areas or use protective
strips (or ramps) to guard against damage and to eliminate tripping hazards.
b. Do not run electrical cords under a rug or carpet (i.e., where wires can overheat) or
place them so as to create a tripping hazard.
21. Do not route extension cords in active cable trays.
22. Protect cords draped through or over structural steel having potential sharp edges.
Extension cords shall be protected from being cut or damaged in doorways (or other pinch
points) by guarding.
23. Protect extension cords from vehicular traffic (e.g., forklifts, Marklifts™, tractors, cranes,
etc.) by elevating or guarding.
24. If an extension cord becomes damaged, it shall be removed from service and returned to
Tool Issue to be inspected, repaired and tested per the assured equipment grounding
testing program, or destroyed.
25. If portable generators are used, follow National Electric Code requirements. GFCI is not
required on receptacles on 2-wire, single-phase portable or vehicle mounted generators
rated not more than 5 kW where the circuit conductors of the generators are insulated from
the generator frame and all other grounded surfaces. For all other conditions, a GFCI is
required and the portable or vehicle mounted generator must be grounded.
NSWP 10.0-77