NFPA 70E
ARC FLASH
“Standard for Electrical Safety in the Workplace”
2009 to 2012
Standards Review
70E Development History
• Evolution
– OSHA 1970 - 1910.331-335 “Electrical Safe Work Practices”
– 1/7/76 NFPA – established “electrical standards development
committee”
– OSHA 6(b) process
– 1979 first edition published as 1 Part; ‘81-2 Parts; ‘83 – 3 Parts
– 2004 (seventh edition) – name and format changed to present
• OSHA does not reference 70E - ARC FLASH
• Present Format is exactly like NFPA 70 the NEC
OSHA and NFPA 70E
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1910.137 PPE design
1910.269 Generation; T&D
1910.301-.308 Subpart S – equipment design and use
1910.331 – “Electrical Safe Work Practices” – action of
“Incorporated by Reference”
1910.332 – Training requirement – the Qualified/
Unqualified person
1910.333 – De-energization, Lock out/Tag out,
Distance requirements, INFEASABLE (70E –
Section 130.2.a)
1910.334 – Testing, Tools, cords, operating
switches
1910.335 – PPE, Signs, Barricades
1910.399 – Definitions
1926.400 Subpart “S” Construction Standard
OSHA Construction
1926
• Subpart K -- Electrical
General
1926.400 Introduction.
1926.401 [Reserved]
INSTALLATION SAFETY REQUIREMENTS
1926.402 Applicability.
1926.403 General requirements.
1926.404 Wiring design and protection.
1926.405 Wiring methods, components, and equipment for general use.
1926.406 Specific purpose equipment and installations.
1926.407 Hazardous (classified) locations.
1926.408 Special systems.
1926.409-1926.415 [Reserved]
OSHA Construction - Continued
1926
• SAFETY-RELATED WORK PRACTICES
1926.416 General requirements.
1926.417 Lockout and tagging of circuits.
1926.418-1926.430 [Reserved]
• SAFETY-RELATED MAINTENANCE AND ENVIRONMENTAL
CONSIDERATIONS
1926.431 Maintenance of equipment.
1926.432 Environmental deterioration of equipment.
1926.433-1926.440 [Reserved]
• SAFETY REQUIREMENTS FOR SPECIAL EQUIPMENT
1926.441 Battery locations and battery charging.
1926.442-1926.448 [Reserved]
• 1926.449 Definitions applicable to this subpart.
Favorite Item
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1910.333(a)(1) and NFPA 70E Section 130.2(a)
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"Deenergized parts." Live parts to which an employee may be exposed shall be
deenergized before the employee works on or near them, unless the employer can
demonstrate that deenergizing introduces additional or increased hazards or is
infeasible due to equipment design or operational limitations. Live parts that
operate at less than 50 volts to ground need not be deenergized if there will be no
increased exposure to electrical burns or to explosion due to electric arcs.
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Note 1: Examples of increased or additional hazards include interruption of life
support equipment, deactivation of emergency alarm systems, shutdown of
hazardous location ventilation equipment, or removal of illumination for an area.
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Note 2: Examples of work that may be performed on or near energized circuit parts
because of infeasibility due to equipment design or operational limitations include
testing of electric circuits that can only be performed with the circuit energized and
work on circuits that form an integral part of a continuous industrial process in a
chemical plant that would otherwise need to be completely shut down in order to
permit work on one circuit or piece of equipment.
70 E Format
• Article 90 – Introduction
• Chapter 1 – Safety Related Work Practices
• Chapter 2 – Safety-Related Maintenance
Requirements
• Chapter 3 – Safety Requirements for Special
Equipment
• Annex’s A – P
2012 70E Changes
• There are 19 Major revisions to Article 90 and
Chapter 1.
• Major revisions to Article 320 “Safety Requirements
Related to Batteries and Battery Rooms
• Chapter 2 and 3 revisions are primarily for
clarification and editorial purposes
• Annex’s D,F,H, J and O received substantial changes
• Annex P is new – Aligning 70E implementation with
Safety Management standards
Chapter 1 Changes
1. 70E Scope had been revised to align with NEC.
2.
Definitions of terms not used in the standard have been deleted.
3. “Flame Resistant (FR)” has been changed to “arcrated (AR) in regard to PPE.
4.
New Article 105, “Application of Safety Related Work Practices” with requirements
formerly included in Article 110 that apply throughout Chapter 1 has been added.
5. 3 year intervals for employee retraining and for
electrical safety program auditing have been
included
6.
7.
Work practices requirements on use of GFCI’s to protect employees has been added
Former 110.8 “Working While Exposed to Electrical Hazards”, has been moved to 130.3
Chapter 1 Changes - Continued
8.
9.
New safety related work practice for underground electrical lines and equipment has been
added
Individual qualified employee control procedure has been deleted from Article 120.
10. Clarification that requirements of Article 130 apply
whether energy incident analysis or hazard/ risk
table is used to determine use and level of PPE has
been provided.
11. New equipment and information have been added
covering use of PPE to protect against arc-flash
hazard associated with enclosed electrical equipment
12. The content of “energized electrical work permit”
(EWP) has been revised and its use clarified.
Chapter 1 Changes - Continued
13. New approach boundary and hazard/risk category
tables for direct current circuits have been added, as
well as information in Annex D on arc flash
calculations
14. A requirement for hearing protection when working
within “arc flash boundary” has been added.
15.
Arc-flash protection for hands has been revised to specify “heavy – duty” leather gloves.
16. Hazard/ risk category tables have been changed to
include short-circuit current, fault clearing time and
potential arc flash boundary information in each of
the major equipment categories instead of in
“specific notes” at the end of the table.
Chapter 1 Changes - Continued
17. 2* delineation for certain H/R Category 2 tasks have been deleted.
18. Former Tables 130.7 (C) (10) and (C) (11) on PPE
selection when hazard/risk category method is used
have been combined into a single table
19. New information requirements to the equipment
labeling provisions have been clarified and added,
and an exception for existing installations has been
added.
Chapter 2
Safety-Related Maintenance Requirements
Article 200 - Introduction
Article 205 - General Maintenance Requirements
Article 210 - Substations, Switchgear Assemblies, Switchboards,
Panelboards, Motor Control Centers and
Disconnect Switches
Article 215 - Premises Wiring
Article 220 - Controller Equipment
Article 225 - Fuses and Circuit Breakers
Article 230 - Rotating Equipment
Article 235 - Hazardous (Classified) Locations
Article 240 - Batteries and Battery Rooms
Article 245 - Portable Electric Tools and Equipment
Article 250 - Personal Safety and Protective Equipment
Chapter 3
Safety Requirements for Special Equipment
•Article 300 - Introduction
•Article 310 - Safety-Related Work Practices for
Electrolytic Cells
Article 320 - Safety Requirements Related to Batteries
and Battery Rooms
Article 330 - Safety-Related Work Practices for Use of
Lasers
Article 340 - Safety-Related Work Practices: Power
Electronic Equipment
Article 350 - Safety-Related Work Requirements:
Research and Development Laboratories
ANNEXs
A - Referenced Publications – part of the 70E
requirements
B - Informational References – not part of the
requirements unless listed in A
C - Limits of Approach – visual depiction
D - Incident Energy and Arc Flash Boundary
Calculation Methods
E - Electrical Safety Program
F - Hazard Analysis, Risk Estimation and Risk
Evaluation Procedure
G - Sample Lockout/ Tagout Procedure
Annex Continued
H - Guidance on Selection of Protective Clothing and
other Personal Protective Equipment
I - Job Briefing and Planning Checklist
J - Energized Electrical Work Permit
K - General Categories of Electrical Hazards
L - Typical Application of Safeguards in the Cell Line
Working Zone
M - Layering of Protective Clothing and Total System
Arc Rating
N - Example Industrial Procedures and Policies for
Working Near Overhead Electrical Lines and
Equipment
Annex Continued
O - Safety-Related Design Requirements
P - Aligning Implementation of This Standard
with Occupational Health and Safety
Management Standards
SUMMARY
My Personal Favorites
• Article 100 Definitions – “Working On”
• 130.2(a) Infeasable
• 130.7(C)(15)(a) Hazard/Risk Category
Classifications
• 130.7(c)(9) (a) Layering
• Annex C – Limits of Approach
• Annex J – Energized Electrical Work Permit
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