SECTION 16476

ENCLOSED CIRCUIT BREAKERS

PART 1 GENERAL

SECTION INCLUDES

Enclosed circuit breakers.

RELATED WORK

Section 16190 - Supporting Devices.

Section 16195 - Electrical Identification: Engraved nameplates.

REFERENCES

NECA (National Electrical Contractors Association) "Standard of Installation."

NEMA AB 1 - Molded Case Circuit Breakers

NFPA 70 - National Electrical Code.

SUBMITTALS

Submit under provisions of Section [01300.] [_______.]

Product Data: Provide catalog sheets showing ratings, trip units, time current curves, dimensions, and enclosure details.

Manufacturer's Installation Instructions: Indicate application conditions and limitations of use stipulated by Product testing agency specified under Regulatory Requirements. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of Product.

QUALITY ASSURANCE

Perform Work in accordance with NECA Standard of Installation.

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_________] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to requirements of NFPA 70.

Furnish products listed and classified by [UL] [testing firm acceptable to authority having jurisdiction] as suitable for purpose specified and indicated.

EXTRA MATERIALS

Furnish under provisions of Section [01700.] [_______.]

Provide [three] [______] of each size and type current limiter.

PART 2 PRODUCTS

MANUFACTURERS

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MOLDED CASE CIRCUIT BREAKER

Circuit Breaker: NEMA AB 1.

Service Conditions:

Temperature: [___] degrees F ([___] degrees C).

Altitude: [___] feet ([___] M).

TRIP UNITS

Field-Adjustable Trip Circuit Breaker: Provide circuit breakers with frame sizes [200] [___] amperes and larger with mechanism for adjusting [long time] [short time] [continuous current] [[short time] [long time] pickup current] setting for automatic operation. Range of Adjustment: [__________________] [seconds.] [amperes.] [percent.]

Field-Changeable Ampere Rating Circuit Breaker: Provide circuit breakers with frame sizes [200] [___] amperes and larger with changeable trip units.

Current Limiting Circuit Breaker: Provide circuit breaker [as indicated] with automatically-reseting current limiting elements in each pole. Let-through Current and Energy: Less than permitted for same size Class RK-5 fuse.

Solid-State Circuit Breaker:	Provide circuit breaker [as scheduled] with electronic sensing, timing and tripping circuits for adjustable current settings; [ground fault

trip with [integral ground fault sensing] [zero sequence type ground fault sensor]]; instantaneous trip; and adjustable short time trip.

CURRENT LIMITERS

Current Limiter:	Designed for application with molded case circuit breaker.

Coordinate limiter size with trip rating of circuit breaker to prevent nuisance tripping and to achieve interrupting current rating specified for circuit breaker.

Provide interlocks to trip circuit breaker and to prevent closing circuit breaker when limiter compartment cover is removed or when one or more limiter is not in place or has operated.

PRODUCT OPTIONS AND FEATURES

Provide accessories [as scheduled,] to NEMA AB 1.

Shunt Trip Device:	[120] [____] volts, [AC] [DC].

Undervoltage Trip Device: [120] [___] volts, [AC] [DC].

Auxiliary Switch: [120] [___] volts, [AC] [DC].

Alarm Switch: [120] [___] volts, [AC] [DC].

Electrical Operator: [120] [___] volts, [AC] [DC].

Handle Lock:	Include provisions for [sealing.] [padlocking.]

Provide mechanical trip device.

Provide [insulated] grounding lug in each enclosure.

Provide Products suitable for use as service entrance equipment where so applied.

ENCLOSURE

Enclosure:	NEMA AB 1, Type [1] [3R] [4] [12] [___].

Fabricate enclosure from [steel] [aluminum] [plastic].

Finish using [manufacturer's standard enamel finish] [_____________________], [gray] [____] color.

PART 3 EXECUTION

INSTALLATION

Install enclosed circuit breakers where indicated, in accordance with manufacturer's instructions.

Install enclosed circuit breakers plumb.	Provide supports in accordance with Section 16190.

Height: 5 ft (1.6 M) to operating handle.

Provide engraved plastic nameplates under the provisions of Section 16195.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [________.]

Inspect and test each circuit breaker to NEMA AB 1.

Inspect each circuit breaker visually.

Perform several mechanical ON-OFF operations on each circuit breaker.

Verify circuit continuity on each pole in closed position.

Determine that circuit breaker will trip on overcurrent condition, with tripping time to NEMA AB 1 requirements.

Include description of testing and results in test report.

ADJUSTING

Adjust work under provisions of Section [01700.] [______.]

Adjust trip settings so that circuit breakers coordinate with other overcurrent protective devices in circuit.

Adjust trip settings to provide adequate protection from overcurrent and fault currents.

SCHEDULES

END OF SECTION