SECTION 16415
MANUAL TRANSFER SWITCHES
DRAFT
PART 1 - GENERAL
1.1
DESCRIPTION
A.
Furnish and install Manual Transfer switches rated 600V and less as specified herein and as required for proper control and distribution of the normal and standby power sources throughout the Project as indicated on the Drawings.
1.2
A.
SUBMITTALS
Product Data: Include ratings and dimensioned plans, sections, and elevations showing
B.
minimum clearances, conductor entry provisions, gutter space, installed features and devices, and material lists for each switch specified.
Drawings: Outline, Schematic and Part Layout drawings shall be provided for each switch. Drawings shall differentiate between manufacturer-installed and field installed wiring. Show both power and control wiring. Drawings and diagrams shall be “as built” shop drawings identifying the switch by serial number. Such drawings shall be unique to the serial number of the switch they represent and shall include only those features of the specific switch.
1.3
C.
Maintenance Data: For each type of product, include maintenance manuals as specified in Division One. Include all features and operating sequences, both automatic and manual. List all factory settings of relays and provide relay setting and calibration instructions, including software, where applicable.
A.
QUALITY ASSURANCE
Electrical Components, Devices and Accessories: Listed and labeled as defined in NFPA
B.
C.
70, Article 100, for emergency service under U.L. 1008, by a testing agency acceptable to authorities having jurisdiction.
Industry Referenced Standards. The following specifications and standards are incorporated into and become a part of this Specification by reference.
1.
Underwriters' Laboratories, Inc. (UL) Publications: UL 1008 – Transfer Switch
2.
3.
4.
5.
Equipment.
NEMA ICS 1 - General Standard for Industrial Controls and Systems
NEMA ICS 2 –447 – AC Automatic Transfer Switches
NEMA ICS 250 – Enclosures for Electrical Equipment
NFPA 70 – Article 702 – Optional Standby Systems
Acceptable Manufacturers. Products by the following manufacturers which conform to this specification are acceptable.
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1.
Generac
2.
Caterpillar
3.
Cummins Onan
4.
Eaton
5.
General Electric
1.4
COORDINATION
A.
Coordinate installation with architectural and structural features and equipment installed under other sections of the specifications to ensure disconnect switch accessibility and ensure that working clearance minimums are provided.
PART 2 - PRODUCTS
2.1
GENERAL MATERIALS REQUIREMENTS
A.
Provide all materials under this section of the specifications.
B.
All manual transfer switches shall be UL listed and bear a UL label.
C.
The manual transfer switch shall be a standard product of a manufacturer regularly engaged in the manufacture of manual transfer switches for a period of at least 10 years.
2.2
MATERIALS DESCRIPTION
A.
Transfer Switch Construction and General Product Requirements
1.
The manual transfer switch shall be 100% rated for continuous duty and suitable for use in emergency situations. Apply as defined in UL 1008 for continuous
2.
3.
4.
5.
loading and total system transfer, including tungsten filament lamp load not exceeding 30 percent of switch ampere rating, unless otherwise indicated.
The complete manual transfer switch shall be listed under U.L. 1008 for use on emergency systems.
Four Pole manual transfer switches shall have all four poles of equal construction including, among other characteristics, arcing contacts, main contacts, and arc chutes. A neutral assembly shall be provided on all 3-pole switches when required.
The manual transfer switch shall be rated to withstand 10,000 amperes RMS symmetrical short circuit fault current available at the transfer switch. The manufacturer shall provide certification of compliance to all U.L. and NEMA
Standards referred to above.
The manual transfer switch shall be positively and reliably interlocked to prevent
6.
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The manual transfer switch shall be mechanically held and manually operated. It shall consist of two molded case switches and manual operator. Connection to the transfer mechanism shall be accomplished by a simple over-center toggle mechanism of the switches, which shall mechanically lock the main contacts in place. Main contacts shall be fully rated, self-wiping, and arc quenching.
Separate arcing contacts with magnetic blowouts shall be provided.
MANUAL TRANSFER SWITCHES
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The manual transfer switch shall be provided with a permanently attached means
B.
7.
to operate the switch without the use of special tools, devices or fixtures. The manual operating means shall provide safety to operators performing transfer under load. The manual operator shall transfer the switch with the same contactto-contact transfer speed as an electrical operator. The transfer switch shall be
“Load Break” rated when manually operated. The inability to manually operate
8.
the transfer switch without first disconnecting loads will not be acceptable.
The transfer switch shall be accessible from either top of bottom entry into the enclosure. All control components and wiring shall be front accessible
Transfer Switch Controls – Manual Transfer Switch to be operable with door 9.
closed (if applicable).
10.
Pilot Lights: Provides two LED indicating lights mounted on the exterior of the transfer switch enclosure, showing the position of the switch or the available sources.
B.
C.
Enclosures
1.
The transfer switch shall be enclosed in an NEMA Standards Publication 250,
Type 1 wall mounted enclosure unless otherwise shown on the drawings or elsewhere herein.
Finishes
1.
Enclosures: Powder Coat over a corrosion-resistant pretreatment and primer.
PART 3 - EXECUTION
3.1
INSTALLATION
A.
Install transfer switch on galvanized steel channel system located on concrete equipment pad level with grade per manufacturer’s instructions.
Mounting: Secure enclosure to structure with four fastening devices. Provide round washer (1.5" diameter minimum) between fastening device and enclosure. Attach directly to structural steel surfaces. Where enclosure is attached to steel structure, mount on galvanized steel channel system mounted to structure. Mount such that operating handle is between 42" and 60" above floor or grade, unless otherwise indicated.
C.
D.
E.
Only one conductor shall be installed under each terminal. Uninsulated conductor shall not extend more than 1/8" inch from terminal lug. Train conductors neatly inside enclosure, parallel and at right angles to box. Do not splice conductors in enclosure.
Ground equipment as indicated and as required by NFPA 70
Provide push-in plugs to close any unused knockout openings.
Connect power cables from both sources and load. Verify that both sources have the identical phase sequence.
F.
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Provide engraved plastic laminate nameplate to indicate phase sequence rotation G.
requirement for generator source connection.
3.2
FIELD QUALITY CONTROL
A.
Upon completion of installation of switches, and after circuitry has been energized with
B.
C.
power source, operate transfer switch in all modes and verify that each are functioning properly. Correct malfunctioning units at site, then retest to demonstrate compliance.
Before energizing equipment, after transfer switch products have been installed:
1.
Measure insulation resistance phase-to-phase and phase-to-ground with insulation-resistance tester. Include external annunciation and control circuits.
2.
3.
Use test voltages and procedure recommended by manufacturer. Meet manufacturer's specified minimum resistance.
Check for electrical continuity of circuits and for short circuits.
Inspect for physical damage; proper installation and connection; and integrity of
4.
barriers, covers, and safety features.
Perform manual transfer operation.
After completion, clean the enclosure interior and exterior of dirt, dust, paint overspray, and construction debris. Any scratched or marred surfaces shall be touched up with factory-supplied paint to match the original finish.
END OF SECTION 263600
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