262413_Switchboards.pdf

CHICOPEE ARMORY REHABILITATION MMD PROJECT NO. 985010

CHICOPEE, MASSACHUSETTS ISSUED FOR BID – 05/20/11

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SECTION 262413

SWITCHBOARDS

PART 1 - GENERAL

1.1 GENERAL

A. Provisions of Section 260500, General Requirements for Electrical Work, apply to the Work of this Section.

1.2 CODES AND STANDARDS

A. Products shall comply with the following codes and standards and shall be UL-listed and labeled:

NEMA

PB-2

Deadfront Distribution

Switchboards

UL 489 Molded Case Circuit Breakers

UL 869 Service Equipment

UL 891 Deadfront Switchboards

1.3 PERFORMANCE REQUIREMENTS

A. Seismic Performance: Switchboards shall withstand the effects of earthquake motions determined according to SEI/ASCE 7.

1. 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."

1.4 SUBMITTALS

A. Product Data: For each type of switchboard, overcurrent protective device, transient voltage suppression device, ground-fault protector, accessory, and component indicated. Include dimensions and manufacturers' technical data on features, performance, electrical characteristics, ratings, accessories, and finishes.

B. Shop Drawings: For each switchboard and related equipment.

1. Include dimensioned plans, elevations, sections, and details, including required clearances and service space around equipment. Show tabulations of installed devices, equipment features, and ratings.

2. Detail enclosure types for types other than NEMA 250, Type 1.

3. Detail bus configuration, current, and voltage ratings.

4. Detail short-circuit current rating of switchboards and overcurrent protective devices.

5. Include descriptive documentation of optional barriers specified for electrical insulation and isolation.

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6. Detail utility company's metering provisions with indication of approval by utility company.

7. Detail features, characteristics, ratings, and factory settings of individual overcurrent protective devices and auxiliary components.

8. Include time-current coordination curves for each type and rating of overcurrent protective device included in switchboards. Submit on translucent log-log graft paper;

include selectable ranges for each type of overcurrent protective device.

C. Seismic Qualification Certificates: Submit certification that switchboards, overcurrent protective devices, accessories, and components will withstand seismic forces defined in

Division 26 Section "Vibration and Seismic Controls for Electrical Systems." Include the following:

1. Basis for Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.

2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

D. Field Quality-Control Reports:

1. Test procedures used.

2. Test results that comply with requirements.

3. Results of failed tests and corrective action taken to achieve test results that comply with requirements.

E. Operation and Maintenance Data: For switchboards and components to include in emergency, operation, and maintenance manuals. In addition to items specified in Division 01 Section

"Operation and Maintenance Data," include the following:

1. Routine maintenance requirements for switchboards and all installed components.

2. Manufacturer's written instructions for testing and adjusting overcurrent protective devices.

3. Time-current coordination curves for each type and rating of overcurrent protective device included in switchboards. Submit on translucent log-log graft paper; include selectable ranges for each type of overcurrent protective device.

1.5 MANUFACTURERS

A. Subject to compliance with the requirements of this Section:

Eaton Electrical Inc.; Cutler-Hammer Business Unit

General Electric Company; GE Consumer & Industrial – Electrical Distribution

Siemens Energy & Automation, Inc.

Square D; a brand of Schneider Electric

1.6 QUALITY ASSURANCE

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A. Installer Qualifications: An employer of workers qualified as defined in NEMA PB 2.1 and trained in electrical safety as required by NFPA 70E.

B. Source Limitations: Obtain switchboards, overcurrent protective devices, components, and accessories from single source from single manufacturer.

C. Product Selection for Restricted Space: Drawings indicate maximum dimensions for switchboards including clearances between switchboards and adjacent surfaces and other items.

Comply with indicated maximum dimensions.

D. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

E. Comply with NEMA PB 2.

F. Comply with NFPA 70.

G. Comply with UL 891.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver switchboards in sections or lengths that can be moved past obstructions in delivery path.

B. Remove loose packing and flammable materials from inside switchboards and

C. Handle and prepare switchboards for installation according to NEMA PB 2.1.

1.8 COORDINATION

A. Coordinate layout and installation of switchboards and components with other construction that penetrates walls or is supported by them, including electrical and other types of equipment, raceways, piping, encumbrances to workspace clearance requirements, and adjacent surfaces.

Maintain required workspace clearances and required clearances for equipment access doors and panels.

B. Coordinate sizes and locations of concrete bases with actual equipment provided. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified in

Division 03.

1.9 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace transient voltage suppression devices that fail in materials or workmanship within specified warranty period.

1. Warranty Period: Five years from date of Substantial Completion.

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PART 2 – PRODUCTS

2.1 GENERAL

A. Switchboards shall be metal enclosed, front-connected and front-accessible, and of the sizes, ratings and arrangement shown on the Drawings.

1. Main Devices: Fixed, individually mounted.

2. Branch Devices: Group mounted.

3. Sections front and rear aligned.

B. Switchboards shall be provided complete with all overcurrent devices, accessories and trim.

C. The short circuit ratings of the assembled switchboards are shown on the drawings. The short circuit rating of every overcurrent device in the panel shall meet or exceed the switchboard rating. Series rated combinations will not be permitted.

D. Incoming Pull And Bus Transition Sections shall be matched and aligned with the basic switchboard.

E. Bus-Bar Insulation shall be factory-applied, flame-retardant, tape wrapping of individual bus bars or flame-retardant, spray-applied insulation. Minimum insulation temperature rating of 105 deg C.

2.2 ENCLOSURE

A. The switchboard shall consist of one or more freestanding vertical sections bolted together to form a rigid assembly.

B. Vertical sections shall be constructed of bolted formed steel channels with code gauge steel side and backplates, and bolt on front trim. All exterior and interior steel surfaces shall be finished in ANSI-61 gray.

C. The enclosure shall be rated NEMA 250, Type 1.

D. Vertical sections shall be front and rear aligned, suitable for installation against a wall. All connections and terminations shall be completely front accessible, with no rear or side access required.

2.3 BUS

A. The main bus shall be a full–capacity bus, hard-drawn, 98% conductivity, rated as shown on the drawings and sized in accordance with UL 891. The bus shall be capable of being extended into future sections. Load terminals shall be insulated, rigidly braced, runback bus extensions, of same material as through buses, equipped with compression type connectors for outgoing circuit conductors.

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B. The neutral bus shall be 100% of the capacity of the phase buses, hard-drawn, 98% conductivity copper, equipped with compression type connectors for outgoing circuit neutral cables .

C. A continuous hard-drawn, 98% conductivity copper ground bus 1/4-by-2-inch, equipped with compression type connectors for feeder and branch circuit conductors shall be provided for the entire length of the switchboard.

D. Buses shall be uniform capacity for the entire length of the switchboard’s main and distribution sections.

2.4 TRANSIENT VOLTAGE SUPPRESSION DEVICES

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Eaton Electrical Inc.; Cutler-Hammer Business Unit.

2. General Electric Company; GE Consumer & Industrial - Electrical Distribution.

3. Siemens Energy & Automation, Inc.

4. Square D; a brand of Schneider Electric.

B. Surge Protection Device Description: IEEE C62.41-compliant, integrally mounted, wired-in , solid-state, parallel-connected, modular (with field-replaceable modules) type, with sine-wave tracking suppression and filtering modules, UL 1449, second edition, short-circuit current rating matching or exceeding the switchboard short-circuit rating, and with the following features and accessories:

1. Fuses, rated at 200-kA interrupting capacity.

2. Fabrication using bolted compression lugs for internal wiring.

3. Integral disconnect switch.

4. Redundant suppression circuits.

5. Redundant replaceable modules.

6. Arrangement with wire connections to phase buses, neutral bus, and ground bus.

7. LED indicator lights for power and protection status.

8. Audible alarm, with silencing switch, to indicate when protection has failed.

9. Form-C contacts rated at 5 A and 250-V ac, one normally open and one normally closed, for remote monitoring of system operation. Contacts shall reverse position on failure of any surge diversion module or on opening of any current-limiting device. Coordinate with building power monitoring and control system.

10. Four -digit, transient-event counter set to totalize transient surges.

C. Peak Single-Impulse Surge Current Rating: 160 kA per mode/320 kA per phase .

D. Withstand Capabilities: 12,000 IEEE C62.41, Category C3 (10 kA), 8-by-20-mic.sec. surges with less than 5 percent change in clamping voltage.

E. Protection modes and UL 1449 SVR for grounded wye circuits with 208Y/120-V, three-phase, four-wire circuits shall be as follows:

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1. Line to Neutral: 400 V for 208Y/120.

2. Line to Ground: 400 V for 208Y/120.

3. Neutral to Ground: 400 V for 208Y/120.

2. 5 OVERCURRENT DEVICES

A. The main disconnecting device shall be a fixed, individually mounted, trip-free thermal magnetic molded case circuit breaker as shown on the Drawings.

B. Distribution overcurrent devices shall be group mounted, trip-free thermal magnetic molded case circuit breakers as shown on the Drawings. Each overcurrent device shall be removable from the front without disturbing adjacent units.

C. All connections shall be rated for 75 o C copper conductors.

2.6 METERING

A. Switchboard “SWBD-1” shall be provided with a multifunction digital panel meter. The meter shall be capable of displaying frequency, voltage between each phase, current in each phase, watts, vars, KVA and power factor.

B. Customer Metering Compartment: A separate customer metering compartment and section with front hinged door, for indicated metering, and current transformers for each meter.

Current transformer secondary wiring shall be terminated on shorting-type terminal blocks.

C. Utility Metering Compartment: Fabricated, barrier compartment and section complying with utility company's requirements; hinged sealed door; buses provisioned for mounting utility company's current transformers and potential transformers or potential taps as required by utility company. If separate vertical section is required for utility metering, match and align with basic switchboard. Provide service entrance label and necessary applicable service entrance features.

2.7 SERVICE ENTRANCE EQUIPMENT

A. Service entrance equipment shall be UL-listed and labeled as "Suitable for Service

Entrance".

2.8 LUGS

A. Cable connections to main lugs and main disconnecting devices shall be compression type lugs.

PART 3 – EXECUTION

3.1 INSTALLATION

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A. Switchboards shall be installed in accordance with Section 260550, Installation of

Electrical Equipment.

3.2 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect, test, and adjust components, assemblies, and equipment installations, including connections.

B. Acceptance Testing Preparation:

1. Test insulation resistance for each switchboard bus, component, connecting supply, feeder, and control circuit.

2. Test continuity of each circuit and circuit breaker contacts.

C. Tests and Inspections:

1. Perform each visual and mechanical inspection and electrical test required by standard industry practices and vendor. Perform circuit breaker trip function by current injection for all circuit breakers rated 400A and higher. Certify compliance with test parameters.

2. Correct malfunctioning units on-site, where possible, and retest to demonstrate compliance; otherwise, replace with new units and retest.

3. Perform the following infrared scan tests and inspections and prepare reports:

a. Initial Infrared Scanning: After Substantial Completion, but not more than 60 days after Final Acceptance, perform an infrared scan of each switchboard. Remove front panels so joints and connections are accessible to portable scanner.

b. Follow-up Infrared Scanning: Perform an additional follow-up infrared scan of each switchboard 11 months after date of Substantial

Completion.

c. Instruments and Equipment: Use an infrared scanning device designed to measure temperature or to detect significant deviations from normal values. Provide calibration record for device.

4. Test and adjust controls, remote monitoring, and safeties. Replace damaged and malfunctioning controls and equipment.

D. Switchboard will be considered defective if it does not pass tests and inspections.

E. Prepare test and inspection reports, including a certified report that identifies switchboards included and that describes scanning results. Include notation of deficiencies detected, remedial action taken, and observations after remedial action.

3.3 ADJUSTING

A. Adjust moving parts and operable components to function smoothly, and lubricate as recommended by manufacturer.

B. Set field-adjustable circuit-breaker trip ranges as indicated by engineer after shop drawing approval.

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3.4 DEMONSTRATION

A. Train Owner's maintenance personnel to adjust, operate, and maintain switchboards, overcurrent protective devices, instrumentation, and accessories, and to use and reprogram microprocessor-based trip, monitoring, and communication units.

END OF SECTION 262413