261316 - Medium-Voltage Fusible Interrupter Switches.pdf

Upgrade Chiller Plant @JLM: Project 1 JLM Memorial Veterans Hospital

598-19-101 01-01-17

Construction Documents 2020.12.30

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SECTION 26 13 16

MEDIUM-VOLTAGE FUSIBLE INTERRUPTER SWITCHES

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installation, connection, and testing of medium-voltage fusible interrupter switches, indicated as switches in this section.

1.2 RELATED WORK

A. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS:

Requirements that apply to all sections of Division 26.

B Section 26 05 13, MEDIUM-VOLTAGE CABLES: Medium-voltage cables and terminations.

C. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS:

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

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

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

1.3 QUALITY ASSURANCE

A. Quality Assurance shall be in accordance with Paragraph, QUALIFICATIONS

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

ELECTRICAL INSTALLATIONS.

1.4 FACTORY TESTS

A. Factory Tests shall be required.

B. Factory Tests shall be in accordance with Paragraph, MANUFACTURED

PRODUCTS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL

INSTALLATIONS, and the following requirements:

1. Switches shall be tested to assure that there are no electrical or mechanical defects. Tests shall be conducted as per UL and ANSI

Standards. Factory tests shall be certified. The following tests shall be performed:

a. Verify that fuse sizes and types are in accordance with drawings and

Overcurrent Protective Device Coordination Study.

b. Verify tightness of bolted electrical connections by calibrated torque-wrench method in accordance with manufacturer’s published data.

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c. Verify correct phase barrier installation.

d. Verify correct operation of all indicating and control devices.

e. Verify appropriate lubrication on moving current-carrying parts and on moving and sliding surfaces.

f. Exercise all active components.

g. Perform an insulation-resistance test, phase to ground, on each bus section, with phases not under test grounded, in accordance with manufacturer’s published data.

1.5 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. Shop drawings shall be submitted simultaneously with or after the

Overcurrent Protective Device Coordination Study.

b. Submit sufficient information to demonstrate compliance with drawings and specifications.

c. Provide information such as complete electrical ratings, dimensions and approximate design weights, enclosure types, mounting details, materials, required clearances, cable terminations, fuse sizes and class, interrupting ratings, wiring diagrams, front, side and rear elevations, sectional views, safety features, accessories, and nameplate data.

2. Manuals:

a. Submit, simultaneously with the shop drawings, companion copies of complete maintenance and operating manuals including technical data sheets, wiring diagrams, and information for ordering replacement parts.

b. If changes have been made to the maintenance and operating manuals originally submitted, submit updated maintenance and operating manuals to the COR two weeks prior to the final inspection.

3. Certification: Two weeks prior to the final inspection, submit the following.

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

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

1.6 APPLICABLE PUBLICATIONS

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

B. American National Standards Institute (ANSI):

C37.57-10...............Metal-Enclosed Interrupter Switchgear

Assemblies - Conformance Testing

C37.58-10...............Indoor AC Medium-Voltage Switches for Use in

Metal-Enclosed Switchgear - Conformance Test

Procedures

C. International Code Council (ICC):

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

D. Institute of Electrical and Electronics Engineers (IEEE):

C37.20.3-13.............Metal-Enclosed Interrupter Switchgear (1kV –

38kV)

C37.22-97...............Preferred Ratings and Related Required

Capabilities for Indoor AC Medium Voltage

Switches Used in Metal-Enclosed Switchgear

C37.47-11...............High Voltage (>1000V) Current-Limiting Type

Distribution Class Fuses and Fuse Disconnecting

Switches

C37.48-10...............Guide for Application, Operation and

Maintenance of High Voltage Fuses, Distribution

Enclosed Single Pole Air Switches, Fuse

Disconnecting Switches, and Accessories

E. National Fire Protection Association (NFPA):

70-17...................National Electrical Code (NEC)

PART 2 - PRODUCTS

2.1 MEDIUM-VOLTAGE FUSIBLE INTERRUPTER SWITCHES

A. Shall be HVLcc by SquareD and in accordance with ANSI, IEEE, NFPA, as shown on the drawings, and have the following features:

1. Deadfront air break, three-pole gang-operated, interrupter type.

2. Copper blades.

3. Interphase barriers for the full length of each pole.

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4. Protective shield to cover the cable connections on the line terminals.

5. Quick-make, quick-break, manual stored-energy type operation mechanism. The mechanism shall enable the switch to close against a fault equal to the momentary rating of the switch without affecting its continuous current carrying or load interrupting ability.

6. External manual operating handle with lock-open padlocking provisions.

7. When the switches are open, the fuses shall be de-energized.

8. Fuses shall be boric acid type E

11. Enclosures:

a. NEMA type shown on the drawings. Where the types of switch enclosures are not shown, they shall be the NEMA types which are most suitable for the environmental conditions where the switches are being installed.

b. Doors:

1) Concealed or semi-concealed hinges shall be used to attach doors. Weld hinges to the enclosure and door.

2) A separate door for the fuse section. A mechanical interlock shall prevent opening the door unless the switch blades are open, and prevent closing the switch if the door is open.

3) Three point door locking mechanism with suitable handles and padlocking provisions.

4) Safety-glass window for viewing the switch blades.

5) Door stops for the open position.

c. Finish:

1) All metal surfaces shall be thoroughly cleaned, phosphatized, primed and painted at the factory.

2) Final finish shall be enamel, lacquer or powder coating.

Enamel and powder coatings shall be oven baked. Color shall be light gray.

B. The minimum momentary current rating shall be 40kA.

C. The minimum short-time 2-second current rating shall be 25kA.

D. Provide full length ground bar.

2.3 NAMEPLATES AND MIMIC BUS

A. Nameplates: For Normal Power system, provide laminated black phenolic resin with white core with 12 mm (1/2 inch) engraved lettered

26 13 16 - 5 nameplates next to each switch. For Essential Electrical System, provide laminated red phenolic resin with white core with 12 mm (1/2 inch) engraved lettered nameplates next to each switch. Nameplates shall indicate equipment served, spaces, or spares in accordance with one line diagram shown on drawings. Nameplates shall be mounted with plated screws on front of switches.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Installation shall be in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions.

B. Anchor switches with rustproof bolts, nuts, and washers not less than

13 mm (1/2 inch) diameter, in accordance with manufacturer’s instructions, and as shown on drawings.

C. Interior Location. Mount gear on concrete slab per requirements on structural drawings and specifications.

3.2 ACCEPTANCE CHECKS AND TESTS

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

1. Visual Inspection and Tests:

a. Compare switches nameplate data with specifications and approved shop drawings.

b. Inspect physical and mechanical condition.

c. Confirm correct application of manufacturer's recommended lubricants.

d. Vacuum-clean switch enclosure interior. Clean switch enclosure exterior.

e. Verify appropriate anchorage and required area clearances.

f. Verify appropriate equipment grounding.

g. Verify correct blade alignment, blade penetration, travel stops, and mechanical operation.

h. Verify that fuse sizes and types correspond to approved shop drawings.

i. Inspect all field-installed bolted electrical connections, verifying tightness of accessible bolted electrical connections by calibrated torque-wrench method, or performing thermographic survey after energization under load.

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j. Exercise all active components.

k. Confirm correct operation of mechanical interlocks.

l. Inspect all indicating devices for correct operation.

3.3 FOLLOW-UP VERIFICATION

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

Contractor shall show by demonstration in service that switches are in good operating condition, and properly performing the intended function.

3.4 SPARE PARTS

A. Two weeks prior to the final inspection, provide one (1) set of spare fuses for each switch installed on this project.

3.5 INSTRUCTION

A. Furnish the services of a factory-trained technician for one 4 hour period for instructing personnel in the operation and maintenance of the switches and related equipment on the date requested by the COR.

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