SECTION 16622 MANUAL TRANSFER EQUIPMENT
PART 1 GENERAL
1.1 RELATED REQUIREMENTS
A. Applicable requirements of Division 0 and Division 1 shall govern work in this Section.
1.2 DESCRIPTION
A. Provide a factory assembled, metal enclosed, manual transfer switch to direct generator power to the treatment plant (normal mode) or to the load bank (exercise mode).
1.3 QUALITY ASSURANCE
A. Equipment shall comply with the requirements of the following Regulatory Agencies:
1. U.S. Environmental Protection Agency (EPA). Design criteria for Mechanical, Electrical, and Fluid System and Component Reliability.
2. National Fire Protection Association (NFPA)
3. Underwriters' Laboratories, Inc. (UL)
4. Local Codes and Ordinances
5. American National Standards Institute (ANSI)
6. National Electrical Manufacturers Association (NEMA). Standard ICS.
7. National Electrical Code (N.E.C.)
8. Occupational Safety and Health Administration (O.S.H.A.)
B. Perform the following production tests on the completed transfer switch:
1. Operation of individual components.
2. Correct overall sequence of operation.
3. Voltage.
4. Dielectric strength test per NEMA Standard ICS 1-109.05.
C. A prototype of the switch shall have been subjected to and have passed the following tests by a certified independent testing laboratory.
1. Overload and endurance at 480 VAC per Table 21.2 and 23.2 of UL 1008 when enclosed per Table 1.6.
D. Provide with fully rated neutral bar.
E. The switch shall have passed tests per paragraph 25 of UL 1008 to withstand current @ 480 VAC and X/R ratio of 6.6 or less using MCB upstream of the MTS.
F. The entire transfer switch and relay plate assembly should be capable of withstanding a 2500 volt crest transient per IEEE standard 472-1974. The transient voltage test shall be conducted across the normal terminals, the exercise terminals, and between opposite
normal and exercise terminals. A certified laboratory test report from an independent testing laboratory shall be furnished to verify conformance.
1.4 SUBMITTALS
A. Shop drawings shall indicate transfer switch, control panel and enclosure dimensions, control arrangements, and singleline diagrams in accordance with ANSI Y 32.2 indicating connections and controls.
B. Submit operation and maintenance manuals under provisions of Section 01730.
1. Submit manufacturer's written recommendations for storage and protection, installation instructions, and field test requirements.
2. Submit manufacturer's instructions for start-up, performing cleaning, operating, and maintaining transfer switch systems.
C. Submit certificates of proper installation and operator training (by manufacturer’s representative) under provisions of Section 01445.
PART 2 PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. ASCO.
B. Russelectric, Inc.
C. GE/Zenith
D. Engineer-approved equal.
2.2 TRANSFER SWITCH RATINGS
A. 2500 Amp, 480Y volt, 3 phase, 4 wire.
B. Open transition switch shall be 4 pole with switched neutral.
C. Minimum Short Circuit Rating: 42,000 rms sym amps.
D. NEMA 4 stainless-steel enclosure, pad-lockable.
2.3 EQUIPMENT SWITCH CONSTRUCTION
A. Transfer switch is to be mechanically held.
B. The switch shall be 100% rated for continuous duty and shall be mechanically interlocked to ensure only one of two possible positions, normal or exercise.
C. Load carrying parts shall have full 600-volt insulation and main contacts, as well as arcing contacts and shall be replaceable without disassembly of the operating mechanism or disconnection of power conductors.
D. The automatic transfer switch shall be suitable for use in emergency systems, listed by Underwriter's Laboratories under Standard 1008 for total system transfer.
E. The transfer switch shall be capable of switching all classes of load and shall be rated for continuous duty when installed in a non-ventilated enclosure constructed in accordance with Underwriters' Laboratories, Inc. Standard UL-508.
F. The transfer switch shall be equipped with a manual operator per paragraph 14 of UL standard 1008. The manual operator shall be designed to operate without opening the inner enclosure door. The switch assembly shall be designed such that manual operation will not put the person standing in front of it at risk of Arc Flash. A mechanical visual indicator for the switch position shall be provided.
G. All wiring and accessories shall be front accessible. Pilot lights shall be on front of cabinet door. All control wire terminals shall be ring or locking spade terminals.
H. All wiring shall be identified by tubular sleeve-type markers.
I. ARC FLASH WARNING LABELS
1. All transfer switches shall include a warning label indicating the risk of arc flash. The warning label shall comply with N.E.C. article 110.16 and O.S.H.A. 29.
2.4 ACCESSORIES
A. The control panel shall meet or exceed the voltage surge withstand capacity in accordance with IEEE Std. 472-1974 and impulse voltage withstand test in accordance with NEMA Std. ICS 1-109 and shall be supplied with the following accessories:
1. Auxiliary contact to open when normal fails.
2. Green Pilot Light for indicating switch in normal position.
3. Red Pilot Light for indicating switch in exercise position.
4. Auxiliary Contact on main shaft (closed on normal).
5. Auxiliary Contact on main shaft (closed on exercise).
6. Strip heater, thermostatically-controlled.
PART 3 EXECUTION
3.1 INSPECTION
A. Examine area to receive transfer switch to assure adequate clearance for transfer switch installation.
B. Start work only after unsatisfactory conditions are corrected.
3.2 INSTALLATION
A. Install transfer switch in accordance with manufacturer's written instructions and NEC.
B. Transfer switch shall be installed on a concrete pad which extends 3 feet in front of transfer switch.
3.3 FIELD QUALITY CONTROL
A. Field Test Prior to Start-up.
B. Megger check of phase-to-phase and phase-to-ground insulation levels.
C. Continuity.
D. Do not megger check solid state equipment.
E. Perform tests according to transfer switch manufacturer's instructions.
3.4 ADJUSTMENTS AND CLEANING
A. Check adjustment of mechanism for free mechanical movement.
B. Tighten connections and mechanical fasteners.
C. Touch up scratched or marred surfaces to match original finish.
3.5 PRODUCT DELIVERY, STORAGE AND HANDLING
A. Do not store indoor type equipment exposed to weather.
B. Protect system equipment from work of other trades.
END OF SECTION
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