262416 - Panels.pdf

Jesse Brown VAMC May 30, 2020 VA: 537-15-160 Emergency Renovations 100% Construct ion Documents Chicago, IL 60064 01-01-18

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SECTION 26 24 16

PANELBOARDS

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installat ion, and connection of panelboards.

1.2 RELATED WORK

A. Section 09 91 00, PAINTING: Painting of panelboa rds.

B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL

COMPONENTS: Requirements for seismic restraint of n on-structural components.

C. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL IN STALLATIONS:

Requirements that apply to all sections of Division 26.

D. Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER C ONDUCTORS AND CABLES:

Low-voltage conductors.

E. Section 26 05 26, GROUNDING AND BONDING FOR ELEC TRICAL SYSTEMS:

Requirements for personnel safety and to provide a low impedance path for possible ground fault currents.

F. Section 26 05 33, RACEWAY AND BOXES FOR ELECTRIC AL SYSTEMS: Conduits.

G. Section 26 05 73, OVERCURRENT PROTECTIVE DEVICE COORDINATION STUDY:

Short circuit and coordination study, and requireme nts for a coordinated electrical system.

H. Section 26 43 13, SURGE PROTECTIVE DEVICES: Surg e protective devices integral to panelboards.

1.3 QUALITY ASSURANCE

A. Quality Assurance shall be in accordance with Pa ragraph, QUALIFICATIONS

(PRODUCTS AND SERVICES) in Section 26 05 11, REQUIR EMENTS FOR

ELECTRICAL INSTALLATIONS.

1.4 SUBMITTALS

A. Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:

1. Shop Drawings:

a. Submit sufficient information to demonstrate com pliance with drawings and specifications.

b. Include electrical ratings, dimensions, mounting details, materials, required clearances, terminations, weigh t, circuit

26 24 16 - 2 breakers, wiring and connection diagrams, accessori es, and nameplate data.

c. Certification from the manufacturer that a repre sentative panelboard has been seismically tested to Internati onal Building

Code requirements. Certification shall be based up on simulated seismic forces on a shake table or by analytical me thods, but not by experience data or other methods.

2. Manuals:

a. Submit, simultaneously with the shop drawings, c omplete maintenance and operating manuals including technic al data sheets, wiring diagrams, and information for orderi ng circuit breakers and replacement parts.

1) Include schematic diagrams, with all terminals i dentified, matching terminal identification in the panelboards .

2) Include information for testing, repair, trouble shooting, assembly, and disassembly.

b. If changes have been made to the maintenance and operating manuals originally submitted, submit updated mainte nance and operating manuals two weeks prior to the final insp ection.

3. Certifications: Two weeks prior to final inspect ion, submit the following.

a. Certification by the manufacturer that the panel boards conform to the requirements of the drawings and specifications .

b. Certification by the Contractor that the panelbo ards have been properly installed, adjusted, and tested.

1.5 APPLICABLE PUBLICATIONS

A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specif ication to the extent referenced. Publications are referenced in t he text by designation only.

B. International Code Council (ICC):

IBC-15..................International Building Code

C. National Electrical Manufacturers Association (N EMA):

PB 1-11.................Panelboards

250-14..................Enclosures for Electrical E quipment (1,000V

Maximum)

D. National Fire Protection Association (NFPA):

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70-17...................National Electrical Code (N EC)

70E-18..................Standard for Electrical Saf ety in the Workplace

E. Underwriters Laboratories, Inc. (UL):

50-15...................Enclosures for Electrical E quipment

67-09...................Panelboards

489-16..................Molded Case Circuit Breaker s and Circuit

Breaker Enclosures

PART 2 - PRODUCTS

2.1 GENERAL REQUIREMENTS

A. Panelboards shall be in accordance with NEC, NEM A, UL, as specified, and as shown on the drawings.

B. Panelboards shall have main breaker or main lugs , bus size, voltage, phases, number of circuit breaker mounting spaces, top or bottom feed, flush or surface mounting, branch circuit breakers, and accessories as shown on the drawings.

C. Panelboards shall be completely factory-assemble d with molded case circuit breakers and integral accessories as shown on the drawings or specified herein.

D. Non-reduced size copper bus bars, rigidly suppor ted on molded insulators, and fabricated for bolt-on type circuit breakers.

E. Bus bar connections to the branch circuit breake rs shall be the

“distributed phase” or “phase sequence” type.

F. Mechanical lugs furnished with panelboards shall be cast, stamped, or machined metal alloys listed for use with the condu ctors to which they will be connected.

G. Neutral bus shall be 200% rated, mounted on insu lated supports.

H. Grounding bus bar shall be equipped with screws or lugs for the connection of equipment grounding conductors.

I. Bus bars shall be braced for the available short -circuit current as shown on the drawings, but not be less than 10,000 A symmetrical for

120/208 V and 120/240 V panelboards, and 14,000 A s ymmetrical for

277/480 V panelboards.

J. In two-section panelboards, the main bus in each section shall be full size. The first section shall be furnished with sub feed lugs on the line side of main lugs only, or through-feed lugs f or main breaker type panelboards, and have field-installed cable connect ions to the second

26 24 16 - 4 section as shown on the drawings. Panelboard sectio ns with tapped bus or crossover bus are not acceptable.

K. Series-rated panelboards are not permitted.

2.2 ENCLOSURES AND TRIMS

A. Enclosures:

1. Provide galvanized steel enclosures, with NEMA r ating as shown on the drawings or as required for the environmental c onditions in which installed.

2. Enclosures shall not have ventilating openings.

3. Enclosures may be of one-piece formed steel or o f formed sheet steel with end and side panels welded, riveted, or bolted as required.

4. Provide manufacturer’s standard option for prepu nched knockouts on top and bottom endwalls.

5. Include removable inner dead front cover, indepe ndent of the panelboard cover.

B. Trims:

1. Hinged “door-in-door” type.

2. Interior hinged door with hand-operated latch or latches, as required to provide access only to circuit breaker operating handles, not to energized parts.

3. Outer hinged door shall be securely mounted to t he panelboard enclosure with factory bolts, screws, clips, or oth er fasteners, requiring a key or tool for entry. Hand-operated la tches are not acceptable.

4. Inner and outer doors shall open left to right.

5. Trims shall be flush or surface type as shown on the drawings.

2.3 MOLDED CASE CIRCUIT BREAKERS

A. Circuit breakers shall be per UL, NEC, as shown on the drawings, and as specified.

B. Circuit breakers shall be bolt-on type.

C. Circuit breakers shall have minimum interrupting rating as required to withstand the available fault current, but not less than:

1. 120/208 V Panelboard: 10,000 A symmetrical.

2. 120/240 V Panelboard: 10,000 A symmetrical.

3. 277/480 V Panelboard: 14,000 A symmetrical.

D. Circuit breakers shall have automatic, trip free , non-adjustable, inverse time, and instantaneous magnetic trips for less than 400 A

26 24 16 - 5 frame. Circuit breakers with 400 A frames and above shall have magnetic trip, adjustable from 5x to 10x. Breaker trip setti ng shall be set in the field, based on the approved protective device study as specified in Section 26 05 71, ELECTRICAL SYSTEM PROTECTIVE D EVICE STUDY .

E. Circuit breaker features shall be as follows:

1. A rugged, integral housing of molded insulating material.

2. Silver alloy contacts.

3. Arc quenchers and phase barriers for each pole.

4. Quick-make, quick-break, operating mechanisms.

5. A trip element for each pole, thermal magnetic t ype with long time delay and instantaneous characteristics, a common t rip bar for all poles and a single operator.

6. Electrically and mechanically trip free.

7. An operating handle which indicates closed, trip ped, and open positions.

8. An overload on one pole of a multi-pole breaker shall automatically cause all the poles of the breaker to open.

9. Ground fault current interrupting breakers, shun t trip breakers, lighting control breakers (including accessories to switch line currents), or other accessory devices or functions shall be provided where shown on the drawings.

10. For circuit breakers being added to existing pa nelboards, coordinate the breaker type with existing panelboards. Modify the panel directory accordingly.

2.4 SURGE PROTECTIVE DEVICES

A. Furnish panelboards with integral surge protecti ve devices. Refer to

Section 26 43 13, SURGE PROTECTIVE DEVICES.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Installation shall be in accordance with the man ufacturer’s instructions, the NEC, as shown on the drawings, an d as specified.

B. Locate panelboards so that the present and futur e conduits can be conveniently connected.

C. In seismic areas, panelboards shall be adequatel y anchored and braced per details on structural contract drawings to with stand the seismic forces at the location where installed.

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D. Install a printed schedule of circuits in each p anelboard after approval by the COR. Schedules shall reflect final load descriptions, room numbers, and room names connected to each circ uit breaker.

Schedules shall be printed on the panelboard direct ory cards and be installed in the appropriate panelboards

E. Mount panelboards such that the maximum height o f the top circuit breaker above the finished floor shall not exceed 1 980 mm (78 inches).

F. Provide blank cover for each unused circuit brea ker mounting space.

G. Panelboard enclosures shall not be used for cond uctors feeding through, spliced, or tapping off to other enclosures or devi ces.

3.2 ACCEPTANCE CHECKS AND TESTS

A. Perform in accordance with the manufacturer's re commendations. In addition, include the following:

1. Visual Inspection and Tests:

a. Compare equipment nameplate data with specificat ions and approved shop drawings.

b. Inspect physical, electrical, and mechanical con dition.

c. Verify appropriate anchorage and required area c learances.

d. Verify that circuit breaker sizes and types corr espond to approved shop drawings.

e. To verify tightness of accessible bolted electri cal connections, use the calibrated torque-wrench method or perform thermographic survey after energization.

f. Vacuum-clean enclosure interior. Clean enclosur e exterior.

3.3 FOLLOW-UP VERIFICATION

A. Upon completion of acceptance checks, settings, and tests, the

Contractor shall demonstrate that the panelboards a re in good operating condition and properly performing the intended func tion.

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