SECTION 16410 - ENCLOSED SWITCHES AND CIRCUIT BREAKERS
PART 1 - GENERAL
1.1
A.
1.2
A.
RELATED DOCUMENTS
Drawings and general provisions of the Contract, including General and Supplementary
Conditions and other Division 1 Specification Sections, apply to this Section.
SUMMARY
This Section includes the following individually mounted, enclosed switches and circuit
breakers:
1.
2.
3.
4.
5.
6.
7.
1.3
Fusible switches.
Nonfusible switches.
Bolted-pressure contact switches.
High-pressure, butt-type contact switches.
Molded-case circuit breakers.
Molded-case switches.
Enclosures.
DEFINITIONS
A.
GFCI: Ground-fault circuit interrupter.
B.
HD: Heavy duty.
C.
SPDT: Single pole, double throw.
1.4
A.
SUBMITTALS
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.
1.
2.
3.
4.
Enclosure types and details for types other than NEMA 250, Type 1.
Current and voltage ratings.
Short-circuit current rating.
Features, characteristics, ratings, and factory settings of individual overcurrent
protective devices and auxiliary components.
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 1
B.
Shop Drawings: Diagram power, signal, and control wiring.
C.
Manufacturer Seismic Qualification Certification: Submit certification that enclosed
switches and circuit breakers, accessories, and components will withstand seismic
forces defined in Division 16 Section "Electrical Supports and Seismic Restraints."
Include the following:
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 and the unit will be fully operational after the seismic event."
2.
Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and
locate and describe mounting and anchorage provisions.
Detailed description of equipment anchorage devices on which the certification is
based and their installation requirements.
3.
D.
Field quality-control test reports including the following:
1.
2.
3.
Test procedures used.
Test results that comply with requirements.
Results of failed tests and corrective action taken to achieve test results that
comply with requirements.
E.
Manufacturer's field service report.
F.
Operation and Maintenance Data: For enclosed switches and circuit breakers to include
in emergency, operation, and maintenance manuals.
1.
2.
1.5
Manufacturer's written instructions for testing and adjusting enclosed switches
and circuit breakers.
Time-current curves, including selectable ranges for each type of circuit breaker.
QUALITY ASSURANCE
A.
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.
B.
Comply with NFPA 70.
C.
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.
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 2
1.6
A.
PROJECT CONDITIONS
Environmental Limitations: Rate equipment for continuous operation under the
following conditions, unless otherwise indicated:
1.
2.
1.7
A.
Ambient Temperature: Not less than minus 22 deg F and not exceeding 104
deg F
Altitude: Not exceeding 6600 feet .
COORDINATION
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.
PART 2 - PRODUCTS
2.1
A.
MANUFACTURERS
In other Part 2 articles where titles below introduce lists, the following requirements
apply to product selection:
1.
2.2
A.
Manufacturers: Subject to compliance with requirements, provide products by
one of the manufacturers specified.
FUSIBLE AND NONFUSIBLE SWITCHES
Manufacturers:
1.
2.
3.
4.
Eaton Corporation; Cutler-Hammer Products.
General Electric Co.; Electrical Distribution & Control Division.
Siemens Energy & Automation, Inc.
Square D/Group Schneider.
B.
Fusible Switch, 600A 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.
C.
Nonfusible Switch, 600A and Smaller: NEMA KS 1, Type HD, lockable handle with
capability to accept two padlocks, and interlocked with cover in closed position.
D.
Accessories:
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 3
1.
2.
2.3
A.
Equipment Ground Kit: Internally mounted and labeled for copper ground
conductors.
Neutral Kit: Internally mounted; insulated, capable of being grounded, and
bonded; and labeled for copper neutral conductors.
FUSED POWER CIRCUIT DEVICES
High-Pressure, Butt-Type Contact Switch: UL 977; operating mechanism shall use
butt-type contacts and a spring-charged mechanism to produce and maintain highcontact pressure when switch is closed.
1.
Manufacturers:
a.
2.
3.
General Electric Co.; Electrical Distribution & Control Division.
Main Contact Interrupting Capability: Twelve times the switch current rating,
minimum.
Operating Mechanism: Manual handle operation to close switch stores energy in
mechanism for closing and opening.
a.
4.
5.
Electrical Trip: Operation of lever or push-button trip switch, or trip signal
from ground-fault relay or remote-control device, causes switch to open.
Service-Rated Switches: Labeled for use as service equipment.
Ground-Fault Relay: Comply with UL 1053. Self-powered type with mechanical
ground-fault indicator, test function, tripping relay with internal memory, and
three-phase current transformer/sensor.
a.
b.
6.
2.4
A.
Open-Fuse Trip Device: Arranged to trip switch open if a phase fuse opens.
MOLDED-CASE CIRCUIT BREAKERS AND SWITCHES
Manufacturers:
1.
2.
3.
4.
B.
Configuration: Integrally mounted relay and trip unit with adjustable
pickup and time-delay settings, push-to-test feature, and ground fault
indicator.
Test Control: Simulates ground fault to test relay and switch (or relay only
if "no-trip" mode is selected).
Eaton Corporation; Cutler-Hammer Products.
General Electric Co.; Electrical Distribution & Control Division.
Siemens Energy & Automation, Inc.
Square D/Group Schneider.
Molded-Case Circuit Breaker:
available fault currents.
NEMA AB 1, with interrupting capacity to meet
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 4
1.
2.
C.
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.
GFCI Circuit Breakers: Single- and two-pole configurations with 5-mA trip
sensitivity.
Molded-Case Circuit-Breaker Features and Accessories:
1.
2.
3.
4.
5.
Standard frame sizes, trip ratings, and number of poles.
Lugs: Mechanical style with compression lug kits suitable for number, size, trip
ratings, and conductor material.
Application Listing: Type SWD for switching fluorescent lighting loads;
Type HACR for heating, air-conditioning, and refrigerating equipment.
Ground-Fault Protection: Integrally mounted relay and trip unit with adjustable
pickup and time-delay settings, push-to-test feature, and ground-fault indicator.
Shunt Trip: 120-V trip coil energized from separate circuit, set to trip at 55
percent of rated voltage.
D.
Molded-Case Switches: Molded-case circuit breaker with fixed, high-set instantaneous
trip only, and short-circuit withstand rating equal to equivalent breaker frame size
interrupting rating.
E.
Molded-Case Switch Accessories:
1.
2.
3.
2.5
A.
Lugs: Mechanical style with compression lug kits suitable for number, size, trip
ratings, and material of conductors.
Application Listing: Type HACR for heating, air-conditioning, and refrigerating
equipment.
Shunt Trip: 120-V trip coil energized from separate circuit, set to trip at 55
percent of rated voltage. Provide "dummy" trip unit where required for proper
operation.
ENCLOSURES
NEMA AB 1 and NEMA KS 1 to meet environmental conditions of installed location.
1.
2.
Wet /Damp Indoor/Outdoor Locations: NEMA 250, Type 3R.
Kitchen Areas: NEMA 250, Type 4X, stainless steel.
PART 3 - EXECUTION
3.1
A.
EXAMINATION
Examine elements and surfaces to receive enclosed switches and circuit breakers for
compliance with installation tolerances and other conditions affecting performance.
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 5
B.
3.2
Proceed with installation only after unsatisfactory conditions have been corrected.
CONCRETE BASES
A.
Coordinate size and location of concrete bases. Verify structural requirements with
structural engineer.
B.
Concrete base is specified in Division 16 Section "Electrical Supports and Seismic
Restraints," and concrete materials and installation requirements are specified in
Division 3.
3.3
INSTALLATION
A.
Comply with applicable portions of NECA 1, NEMA PB 1.1, and NEMA PB 2.1 for
installation of enclosed switches and circuit breakers.
B.
Mount individual wall-mounting switches and circuit breakers with tops at uniform
height, unless otherwise indicated. Anchor floor-mounting switches to concrete base.
C.
Comply with mounting and anchoring requirements specified in Division 16 Section
"Electrical Supports and Seismic Restraints."
D.
Temporary Lifting Provisions: Remove temporary lifting eyes, channels, and brackets
and temporary blocking of moving parts from enclosures and components.
3.4
IDENTIFICATION
A.
Identify field-installed conductors, interconnecting wiring, and components; provide
warning signs as specified in Division 16 Section "Electrical Identification."
B.
Enclosure Nameplates: Label each enclosure with engraved metal or laminated-plastic
nameplate as specified in Division 16 Section "Electrical Identification."
3.5
A.
FIELD QUALITY CONTROL
Manufacturer's Field Service: Engage a factory-authorized service representative to
inspect, test, and adjust field-assembled components and equipment installation,
including connections. Report results in writing.
1.
2.
Test mounting and anchorage devices according to requirements in Division 16
Section "Electrical Supports and Seismic Restraints."
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.
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ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 6
3.
3.6
A.
3.7
Correct malfunctioning units on-site, where possible, and retest to demonstrate
compliance; otherwise, replace with new units and retest.
ADJUSTING
Set field-adjustable switches GFI settings and circuit-breaker trip ranges.
CLEANING
A.
On completion of installation, vacuum dirt and debris from interiors; do not use
compressed air to assist in cleaning.
B.
Inspect exposed surfaces and repair damaged finishes.
END OF SECTION 16410
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Southern Crescent Technical College
11009
ENCLOSED SWITCHES AND CIRCUIT
BREAKERS
16410 - 7