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Disconnect Switches - BBI Operations

By Alan Lawrence,2014-06-04 03:58
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Disconnect Switches - BBI OperationsDiscon

    Harris County Toll Road Authority Tomball Tollway

    SPECIAL SPECIFICATION

    16411

    Disconnect Switches

PART 1 - GENERAL

1.01 SECTION INCLUDES

    A. Furnish and install disconnect switches, including:

    1. Fuses.

    2. Enclosures.

1.02 RELATED SECTIONS

A. Section 16070 - Supporting Devices.

    B. Section 16075 - Electrical Identification.

1.03 REFERENCES

A. NFPA 70 - National Electrical Code.

B. UL 198E - Class J Fuses.

1.04 SUBMITTALS

A. Furnish dimensions and ratings for voltage, ampacity, horsepower and short circuit.

B. Indicate enclosure material finish and NEMA classification type.

PART 2 - PRODUCTS

2.01 MANUFACTURERS

A. Manufacturers include but are not limited to those listed. All proposed components

    and materials are subject to the approval of the engineer

B. Disconnect Switches

    1. General Electric.

    2. Square D.

C. Fuses

    1. Bussman.

    2. Gould-Shawmut.

    3. Littelfuse.

Contract 802 SS 16411 Job No. 13/0180

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Harris County Toll Road Authority Tomball Tollway

2.02 DISCONNECT SWITCHES

    A. Fusible Switch Assemblies: Heavy duty; quick-make, quick-break, load interrupter

    enclosed switch with externally operable handle interlocked to prevent opening front

    cover with switch in ON position. Handle lockable in OFF position. Fuse Clips:

    Designed to accommodate Class J.

    B. Nonfusible Switch Assemblies: Heavy duty; quick-make, quick-break, load

    interrupter enclosed switch with externally operable handle interlocked to prevent

    opening front cover with switch in ON position. Handle lockable in OFF position.

    C. Enclosures: Unless indicated otherwise, provide general purpose, NEMA 1 for indoor

    locations; and weatherproof, NEMA 3R for outdoor locations; except at cooling tower,

    provide NEMA 4, stainless steel.

    D. General-Use Snap Switch: Motors of one HP or less as allowed by code.

    E. Construct all current carrying parts of high conductivity copper with silver-plated

    switch contacts.

    F. Provide solid copper neutral bar where a neutral is present in the circuit.

2.03 FUSES

    A. Fuses 600 Amperes and Less: UL 198E, Class J; as indicated on drawings; time delay,

    dual element, current limiting, 600 volt.

    B. Fuses Over 600 Amperes: Class L, bolt-on type with time delay and capability to hold

    500 percent rated fuse current for a minimum of four seconds and clear 20 times rated

    fuse current in .01-second or less. Provide fuses with 'O' ring seals between end bells

    and glass melamine barrel similar to Bussman time delay KRP-C.

C. Interrupting Rating: 200,000 RMS symmetrical amperes.

D. Provide all fuses of the same manufacturer.

    E. Install fuses in motor circuits in accordance with motor manufacturer's

    recommendations.

PART 3 - EXECUTION

3.01 INSTALLATION

    A. Provide disconnect switches, where required by NFPA 70, where indicated on

    drawings, and where required by equipment manufacturer, in a location convenient

    for maintenance on each switch and adjacent equipment.

    B. Provide fused disconnect switches when required to maintain equipment

    manufacturer's warranty. Coordinate with Division 15 for warranty requirements of

    equipment approved by submittal.

Contract 802 SS 16411 Job No. 13/0180

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Harris County Toll Road Authority Tomball Tollway

    C. Install fuses in fusible disconnect switches. Provide permanent marking inside switch

    enclosure for fuse type.

    D. Wall mount switches, where possible, or mount on Uni-Strut supports.

    E. Provide spare fuse cabinet in main electrical room complete with three spare fuses for

    each rating installed for fuse sizes over 600 amperes, and ten percent spare fuses

    (minimum of three) of each type and rating installed for 600 amperes or less.

    F. Provide fuse identification label showing type and size inside door of each switch.

PART 4 - METHOD OF MEASUREMENT AND PAYMENT

    4.01 METHOD OF MEASUREMENT

    A. Measurement of the disconnect switch shall include all work and materials

    required by the specification and plan details to install a disconnect switch

    complete and in place.

    4.02 BASIS OF PAYMENT

    A. Payment for the disconnect switch shall include all work and materials required

    by this specification and plan details. This price shall be full compensation for

    furnishing all materials and for all preparation, assembly, and installation of these

    materials, and for all labor, equipment, tools, and incidentals necessary to

    complete this item in accordance with the provisions and intent of the plans and

    specifications.

    Payment will be made under:

    16411-01 Disconnect Switch 200A/2P/200AF/N34 Per Each

    (Item Bid Code 16411-2001)

    END OF SPECIAL SPECIFICATION

Contract 802 SS 16411 Job No. 13/0180

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