261316 MEDIUM-VOLTAGE FUSIBLE INTERRUPTER SWITCHES.pdf

Dallas VA Medical Center

Dallas, TX

Correct Electrical Deficiencies

#549-19-190

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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 03 30 53, (SHORT FORM) CAST-IN-PLACE CONCRETE: Requirements for concrete equipment pads.

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

Requirements that apply to all sections of Division 26.

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

D. 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.

E. 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.

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

c. Verify operation of mechanical interlocks.

d. Verify correct phase barrier installation.

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

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

g. Exercise all active components.

h. 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 //Resident Engineer// //COR// two weeks prior to the final inspection.

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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.

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)

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PART 2 - PRODUCTS

2.1 MEDIUM-VOLTAGE FUSIBLE INTERRUPTER SWITCHES & MAIN BREAKER

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

1. The main breaker section shall be comprised of switchgear assembly consisting of completely metal-enclosed, dead front vertical sections requiring only front access for connection, maintenance and operation of the switchgear and containing various combinations of circuit breakers and auxiliaries of rating and type noted on the drawings or specified herein. Switchgear shall match existing

(Eaton).

2. The switchgear shall be front accessible such that it can be installed against the wall, and shall not require rear access for its maintenance, inspection, or operation. Primary bus joints and supports that are not accessible from the front are to be designed such that no maintenance is necessary for those joints or supports. All necessary access for owner’s primary cable terminations, joining of main and ground bus joints at shipping splits, and termination of control wires shall be provided from the front or top of the switchgear. Access to primary cable terminals shall not require the removal of any primary or secondary devices.

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

4. Copper blades.

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

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

7. 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.

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

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

SPEC WRITER NOTE: Select fuse type. Show ratings on the drawings.

10. Current limiting fuses. Blown fuse indication on all 3 phases

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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 40 kA.

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

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 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.

B. Mimic Bus: Provide an approved mimic bus on front of each switch assembly. Color shall be black for the Normal Power system and red for the Essential Electrical System, either factory-painted plastic or metal strips. Plastic tape shall not be used. Use symbols similar to

26 13 16 - 6 one line diagram shown on drawings. Plastic or metal strips shall be mounted with plated screws.

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 switches on concrete slab. Unless otherwise indicated, the slab shall be at least 100 mm (4 inches) thick. The top of the concrete slab shall be approximately 100 mm (4 inches) above finished floor. Edges above floor shall have 15 mm (1/2 inch) chamfer.

The slab shall be of adequate size to project at least 100 mm (8 inches) beyond the equipment. Provide conduit turnups and cable entrance space required by the equipment to be mounted. Seal voids around conduit openings in slab with water- and oil-resistant caulking or sealant. Cut off and bush conduits 75 mm (3 inches) above slab surface. Concrete work shall be as specified in Section 03 30 00, CAST-

IN-PLACE CONCRETE.

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.

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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.

j. Exercise all active components.

k. Confirm correct operation of mechanical interlocks.

m. 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.

3.5 SPARE PARTS

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

3.6 ONE LINE DIAGRAM AND SEQUENCE OF OPERATION

A. At final inspection, an as-built one line diagram shall be laminated or mounted under acrylic glass, and installed in a frame mounted in the switchgear room or in the outdoor switchgear enclosure.

B. Furnish a written sequence of operation for the switchgear and connected line side/load side electrical distribution equipment. The sequence of operation shall be laminated or mounted under acrylic glass, and installed in a frame mounted in the switchgear room or in the outdoor switchgear enclosure.

C. Deliver an additional four copies of the as-built one line diagram and sequence of operation to the COR.

3.7 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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