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SECTION 16410
ENCLOSED SWITCHES AND CIRCUIT BREAKERS
PART 1. GENERAL
1.1 RELATED DOCUMENTS
1.1.1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other
Division 1 Specification Sections, apply to this Section.
1.2 SUMMARY
1.2.1. This Section includes the following individually mounted, enclosed switches and circuit breakers:
1.2.1.1.
Fusible switches.
1.2.1.2.
Nonfusible switches.
1.2.1.3.
Bolted-pressure contact switches.
1.2.1.4.
Molded-case switches.
1.2.1.5.
Enclosures.
1.3 DEFINITIONS
1.3.1. GD: General duty.
1.3.2. GFCI: Ground-fault circuit interrupter.
1.3.3. HD: Heavy duty.
1.3.4. RMS: Root mean square.
1.3.5. SPDT: Single pole, double throw.
1.4 SUBMITTALS
1.4.1. Product Data: For each type of enclosed switch, circuit breaker, accessory, and component indicated.
Include dimensioned elevations, sections, weights, and manufacturers' technical data on features,
performance, electrical characteristics, ratings, and finishes.
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1.4.1.1.
Enclosure types and details for types other than NEMA 250, Type 1.
1.4.1.2.
Current and voltage ratings.
1.4.1.3.
Short-circuit current rating.
1.4.1.4.
UL listing for series rating of installed devices.
1.4.1.5.
Features, characteristics, ratings, and factory settings of individual overcurrent protective
devices and auxiliary components.
1.4.2. Shop Drawings: Diagram power, signal, and control wiring.
1.4.3. Manufacturer Seismic Qualification Certification: Submit certification that enclosed switches and circuit
breakers, accessories, and components will withstand seismic forces defined in Division 16 Section
"Seismic Controls for Electrical Work." Include the following:
1.4.3.1.
Basis of Certification: Indicate whether withstand certification is based on actual test of
assembled components or on calculation.
a.
The term "withstand" means "the unit will remain in place without separation of any parts
from the device when subjected to the seismic forces specified."
1.4.3.2.
Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate
and describe mounting and anchorage provisions.
1.4.3.3.
Detailed description of equipment anchorage devices on which the certification is based and
their installation requirements.
1.4.4. Qualification Data: For testing agency, if used.
1.4.5. Field quality-control test reports including the following:
1.4.5.1.
Test procedures used.
1.4.5.2.
Test results that comply with requirements.
1.4.5.3.
Results of failed tests and corrective action taken to achieve test results that comply with
requirements.
1.4.6. Operation and Maintenance Data: For enclosed switches and circuit breakers to include in emergency,
operation, and maintenance manuals. In addition to items specified in Division 1 Section "Phase
Turnover and Contract Closeout," include the following:
1.4.6.1.
Manufacturer's written instructions for testing and adjusting enclosed switches and circuit
breakers.
1.4.6.2.
Time-current curves, including selectable ranges for each type of circuit breaker.
1.5 QUALITY ASSURANCE
1.5.1. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100,
by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
1.5.2. Comply with NFPA 70.
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1.5.3. Product Selection for Restricted Space: Drawings indicate maximum dimensions for enclosed switches and
circuit breakers, including clearances between enclosures, and adjacent surfaces and other items. Comply
with indicated maximum dimensions.
1.6 PROJECT CONDITIONS
1.6.1. Environmental Limitations: Rate equipment for continuous operation under the following conditions, unless
otherwise indicated:
1.6.1.1.
Ambient Temperature: Not less than minus 22 deg F and not exceeding 104 deg F.
1.6.1.2.
Altitude: Not exceeding 6600 feet.
1.7 COORDINATION
1.7.1. Coordinate layout and installation of switches, circuit breakers, and components with other construction,
including conduit, piping, equipment, and adjacent surfaces. Maintain required workspace clearances and
required clearances for equipment access doors and panels.
1.8 EXTRA MATERIALS
1.8.1. Furnish extra materials described below that match products installed and that are packaged with protective
covering for storage and identified with labels describing contents.
1.8.1.1.
Spares: For the following:
a.
Potential Transformer Fuses: One set of each size and type used.
b.
Control-Power Fuses: One set of each size and type used.
c.
Fuses for Fusible Switches: One set of each size and type used.
d.
Fuses for Fused Power Circuit Devices: One set of each size and type used.
1.8.1.2.
Spare Indicating Lights: [Six] [One set] of each type installed.
PART 2. PRODUCTS É
2.1 MANUFACTURERS
2.1.1. In other Part 2 articles where titles below introduce lists, the following requirements apply to product
selection:
2.1.1.1.
Available Manufacturers: Subject to compliance with requirements, manufacturers offering
products that may be incorporated into the Work include, but are not limited to, manufacturers
specified.
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2.2 FUSIBLE AND NONFUSIBLE SWITCHES
2.2.1. Available Manufacturers:
2.2.1.1.
Eaton Corporation; Cutler-Hammer Products.
2.2.1.2.
General Electric Co.; Electrical Distribution & Control Division.
2.2.1.3.
Siemens Energy & Automation, Inc.
2.2.1.4.
Square D/Group Schneider.
2.2.2. Fusible Switch, 1200 A and Smaller: NEMA KS 1, Type HD, with clips or bolt pads to accommodate
specified fuses, lockable handle with capability to accept two padlocks, and interlocked with cover in
closed position.
2.2.3. Nonfusible Switch, 1200 A and Smaller: NEMA KS 1, TypeHD, lockable handle with capability to accept
two padlocks, and interlocked with cover in closed position.
2.2.4. Accessories:
2.2.4.1.
Equipment Ground Kit: Internally mounted and labeled for copper and aluminum ground
conductors.
2.2.4.2.
Neutral Kit: Internally mounted; insulated, capable of being grounded, and bonded; and
labeled for copper and aluminum neutral conductors.
2.2.4.3.
Auxiliary Contact Kit: Auxiliary set of contacts arranged to open before switch blades
open.
2.3 FUSED POWER CIRCUIT DEVICES
2.3.1. Bolted-Pressure Contact Switch: UL 977; operating mechanism shall use a rotary-mechanical-bolting action
to produce and maintain high-clamping pressure on the switch blade after it engages the stationary
contacts.
2.3.1.1.
Available Manufacturers:
a.
Boltswitch, Inc.
b.
Eaton Corporation; Cutler-Hammer Products.
c.
Pringle Electrical Mfg. Co.
d.
Siemens Energy & Automation, Inc.
e.
Square D/Group Schneider.
2.3.1.2.
Main Contact Interrupting Capability: Twelve times the switch current rating, minimum.
2.3.1.3.
Operating Mechanism: Manual handle operation to close switch stores energy in
mechanism for closing and opening.
a.
Electrical Trip: Operation of lever or push-button trip switch, or trip signal from groundfault relay or remote-control device, causes switch to open.
b.
Mechanical Trip: Operation of mechanical lever or push button or another device causes
switch to open.
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2.3.1.4.
Auxiliary Switches: Factory installed, SPDT, with leads connected to terminal block, and
including one set more than quantity required for functional performance indicated.
2.3.1.5.
Service-Rated Switches: Labeled for use as service equipment.
2.3.1.6.
Ground-Fault Relay: Comply with UL 1053. Self-powered type with mechanical groundfault indicator, test function, tripping relay with internal memory, and three-phase current
transformer/sensor.
a.
Configuration: [Integrally mounted] [Remote-mounted] relay and trip unit with
adjustable pickup and time-delay settings, push-to-test feature, and ground fault indicator.
b.
Internal Memory: Integrates the cumulative value of intermittent arcing ground-fault
currents and uses the effect to initiate tripping.
c.
No-Trip Relay Test: Operation of "no-trip" test control permits ground-fault simulation
test without tripping switch.
d.
Test Control: Simulates ground fault to test relay and switch (or relay only if "no-trip"
mode is selected).
2.3.1.7.
Open-Fuse Trip Device: Arranged to trip switch open if a phase fuse opens.
2.4 MOLDED-CASE CIRCUIT BREAKERS AND SWITCHES
2.4.1. Available Manufacturers:
2.4.1.1.
Eaton Corporation; Cutler-Hammer Products.
2.4.1.2.
General Electric Co.; Electrical Distribution & Control Division.
2.4.1.3.
Moeller Electric Corporation.
2.4.1.4.
Siemens Energy & Automation, Inc.
2.4.1.5.
Square D/Group Schneider.
2.4.2. Molded-Case Circuit Breaker: NEMA AB 1, with interrupting capacity to meet available fault currents.
2.4.2.1.
Thermal-Magnetic Circuit Breakers: Inverse time-current element for low-level overloads
and instantaneous magnetic trip element for short circuits. Adjustable magnetic trip setting for
circuit-breaker frame sizes 250 A and larger.
2.4.2.2.
Adjustable Instantaneous-Trip Circuit Breakers: Magnetic trip element with front-mounted,
field-adjustable trip setting.
2.4.2.3.
Electronic Trip-Unit Circuit Breakers: RMS sensing; field-replaceable rating plug; with the
following field-adjustable settings:
a.
Instantaneous trip.
b.
Long- and short-time pickup levels.
c.
Long- and short-time time adjustments.
d.
Ground-fault pickup level, time delay, and I2t response.
2.4.2.4.
Current-Limiting Circuit Breakers: Frame sizes 400 A and smaller and let-through ratings
less than NEMA FU 1, RK-5.
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2.4.2.5.
GFCI Circuit Breakers:
sensitivity.
Single- and two-pole configurations with [5] [30]-mA trip
2.4.3. Molded-Case Circuit-Breaker Features and Accessories:
2.4.3.1.
Standard frame sizes, trip ratings, and number of poles.
2.4.3.2.
Lugs: Mechanical style[ with compression lug kits] suitable for number, size, trip ratings,
and conductor material.
2.4.3.3.
Application Listing: Type SWD for switching fluorescent lighting loads; Type HACR for
heating, air-conditioning, and refrigerating equipment.
2.4.3.4.
Ground-Fault Protection: [Integrally mounted] [Remote-mounted] relay and trip unit
with adjustable pickup and time-delay settings, push-to-test feature, and ground-fault indicator.
2.4.3.5.
Shunt Trip: 120-V trip coil energized from separate circuit, set to trip at [55] [75] percent of
rated voltage.
2.4.3.6.
Undervoltage Trip: Set to operate at 35 to 75 percent of rated voltage [without intentional]
[with field-adjustable 0.1- to 0.6-second] time delay.
2.4.3.7.
Auxiliary Switch: [One SPDT switch] [Two SPDT switches] with "a" and "b" contacts;
"a" contacts mimic circuit-breaker contacts, "b" contacts operate in reverse of circuit-breaker
contacts.
2.4.3.8.
Key Interlock Kit: Externally mounted to prohibit circuit-breaker operation; key shall be
removable only when circuit breaker is in off position.
2.4.3.9.
Zone-Selective Interlocking: Integral with electronic trip unit; for interlocking ground-fault
protection function.
2.4.4. Molded-Case Switches: Molded-case circuit breaker with fixed, high-set instantaneous trip only, and shortcircuit withstand rating equal to equivalent breaker frame size interrupting rating.
2.4.5. Molded-Case Switch Accessories:
2.4.5.1.
Lugs: Mechanical style[ with compression lug kits] suitable for number, size, trip ratings,
and material of conductors.
2.4.5.2.
Application Listing:
equipment.
Type HACR for heating, air-conditioning, and refrigerating
2.4.5.3.
Shunt Trip: 120-V trip coil energized from separate circuit, set to trip at [55] [75] percent of
rated voltage. Provide "dummy" trip unit where required for proper operation.
2.4.5.4.
Undervoltage Trip: Set to operate at 35 to 75 percent of rated voltage [without intentional]
[with field-adjustable 0.1- to 0.6-second] time delay. Provide "dummy" trip unit where required
for proper operation.
2.4.5.5.
Auxiliary Switch: [One SPDT switch] [Two SPDT switches] with "a" and "b" contacts;
"a" contacts mimic circuit-breaker contacts, "b" contacts operate in reverse of circuit-breaker
contacts.
2.4.5.6.
Key Interlock Kit: Externally mounted to prohibit operation; key shall be removable only
when switch is in off position.
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2.5 ENCLOSURES
2.5.1. NEMA AB 1 and NEMA KS 1 to meet environmental conditions of installed location.
2.5.1.1.
Outdoor Locations: NEMA 250, Type 3R.
2.5.1.2.
Kitchen Areas: NEMA 250, Type 4X, stainless steel.
2.5.1.3.
Other Wet or Damp Indoor Locations: NEMA 250, Type 4.
PART 3. EXECUTION
3.1 EXAMINATION
3.1.1. Examine elements and surfaces to receive enclosed switches and circuit breakers for compliance with
installation tolerances and other conditions affecting performance.
3.1.2. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 CONCRETE BASES
3.2.1. Coordinate size and location of concrete bases. Verify structural requirements with structural engineer.
3.2.2. Concrete base is specified in Division 16 Section "Basic Electrical Materials and Methods," and concrete
materials and installation requirements are specified in Division 3.
3.3 INSTALLATION
3.3.1. Comply with applicable portions of NECA 1, NEMA PB 1.1, and NEMA PB 2.1 for installation of enclosed
switches and circuit breakers.
3.3.2. Mount individual wall-mounting switches and circuit breakers with tops at uniform height, unless otherwise
indicated. Anchor floor-mounting switches to concrete base.
3.3.3. Comply with mounting and anchoring requirements specified in Division 16 Section "Seismic Controls for
Electrical Work."
3.3.4. Temporary Lifting Provisions: Remove temporary lifting eyes, channels, and brackets and temporary
blocking of moving parts from enclosures and components.
3.4 IDENTIFICATION
3.4.1. Identify field-installed conductors, interconnecting wiring, and components; provide warning signs as
specified in Division 16 Section "Electrical Identification."
3.4.2. Enclosure Nameplates: Label each enclosure with engraved metal or laminated-plastic nameplate as
specified in Division 16 Section "Electrical Identification."
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3.5 FIELD QUALITY CONTROL
3.5.1. Manufacturer's Field Service: For the equipment listed below, engage a factory-authorized service
representative to inspect, test, and adjust field-assembled components and equipment installation,
including connections, and to assist in field testing. Report results in writing.
3.5.1.1.
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3.5.2. Prepare for acceptance testing as follows:
3.5.2.1.
Inspect mechanical and electrical connections.
3.5.2.2.
Verify switch and relay type and labeling verification.
3.5.2.3.
Verify rating of installed fuses.
3.5.2.4.
Inspect proper installation of type, size, quantity, and arrangement of mounting or
anchorage devices complying with manufacturer's certification.
3.5.3. Perform the following field tests and inspections and prepare test reports:
3.5.3.1.
Test mounting and anchorage devices according to requirements in Division 16 Section
"Seismic Controls for Electrical Work."
3.5.3.2.
Perform each electrical test and visual and mechanical inspection stated in NETA ATS,
Section 7.5 for switches and Section 7.6 for molded-case circuit breakers. Certify compliance
with test parameters.
3.5.3.3.
Check all features of each installed switch and circuit breaker for proper operation.
3.5.3.4.
Correct malfunctioning units on-site, where possible, and retest to demonstrate compliance;
otherwise, replace with new units and retest.
3.5.3.5.
Infrared Scanning:
a.
Initial Infrared Scanning: After Substantial Completion, but not more than 60 days after
Final Acceptance, perform an infrared scan of each enclosed switch and circuit breaker.
Open or remove doors or panels so connections are accessible to portable scanner.
b.
Instruments, Equipment and Reports:
(1)
(2)
Use an infrared scanning device designed to measure temperature or to detect
significant deviations from normal values. Provide calibration record for device.
Prepare a certified report that identifies enclosed switches and circuit breakers
included and describes scanning results. Include notation of deficiencies detected,
remedial action taken, and observations after remedial action.
3.6 ADJUSTING
3.6.1. Set field-adjustable switches and circuit-breaker trip ranges.
3.7 CLEANING
3.7.1. On completion of installation, vacuum dirt and debris from interiors; do not use compressed air to assist in
cleaning.
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3.7.2. Inspect exposed surfaces and repair damaged finishes.
END OF SECTION 16410
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