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Transcript
SECTION 16409 POWER DISTRIBUTION UNITS 409.01 A. Manufacturer Power Distribution Units shall be manufactured by Emergency Power Engineering (EPE), AAA Power System Company or Computer Power Systems (CPS). The manufacturer shall have at least a 4 year history with PDU’s. 409.02 A. Description The basic components of the PDU shall consist of an input power cable with input junction box, main input circuit breaker, cabinet, multishield isolation transformer, internal wiring, single point ground, output 42 pole panelboard(s) with secondary circuit breaker protection, system status panel, conduit landing bracket for output cables and any optional features. 409.03 A. Construction The PDU shall be U.L. Listed under standard 478 for data processing equipment. All components shall be U.L. Listed. The input power cable shall be liquid tight flexible conduit, conductors shall be sized to carry 125% of full load capacity of the PDU. The ground conductor shall be the same size as the phase conductors. The input junction box shall have a terminal strip to connect the incoming conductors to the PDU input power conductors. The junction box shall be sized in accordance to the NEC. The PDU shall be equipped with a main input circuit breaker with a low voltage shunt trip coil. The main C.B. shall be rated for 125% of full load, molded case construction, and thermal magnetic type. The rating shall be 22,000 AIC minimum, unless a higher rating is specified. The cabinet shall consist of a metal frame to solidly support all components, wiring, and metal covers. Internal sheet metal, not welded to the frame shall be plated with Gold Zinc Wash to ensure RFE, EMI susceptibility is reduced. Removable side, front and rear panels shall be provided for access to components. Any mesh or screening used for cooling shall have holes no larger than 3/32 to prevent objects from entering the enclosure. 16409-rev0 16409 - 1 December 2004 SECTION 16409 POWER DISTRIBUTION UNITS The transformer shall have electrostatic multi-shields, bc convection cooled, 3 phase delta-wye; with copper windings and adjustable taps: 2-2 ½% above and 4-2 ½% below. Efficiency - 96% noise rejection - common mode of 120 db and normal mode of 60 db. Internal wiring shall be multi-stranded conductors, with terminations clearly labeled. Secondary and Primary power wiring shall not pass through the same access holes in the transformer shield. When in close proximity, secondary and primary wiring shall cross at 90 to reduce noise. A single point copper ground bus shall be provided. Minimum size is ¼” thick X 1" wide. The bus should be silver plated to provide best connections. The following shall be grounded to the bus: transformer neutral, transformer core, primary and secondary shields, frame, equipment grounding conductors from the branch circuits, system monitoring electronics, all input and output conduits through the conduit landing plates. One or more output panelboards with secondary circuit breaker protection shall be provided. The PDU shall be provided with plug-in circuit breakers, Square “D” or equivalent. Each panelboard shall have 42 pole positions and have separate ground and neutral bus for each panel. The system status panel shall have the following features: output voltage, current (3 phases), KVA, and % load. Alarm shall include over/under voltage, transformer over temperature shutdown, and any other alarms that may be specified. Functions shall include EPO, alarm sheet, audible alarm, and audible silence. Remote EPO interface shall be provided. The terminal connection point shall be clearly marked. 409.04 A. Electrical Characteristics Input voltage: 480, or 208 VAC as specified, 3 ph, 3 wire plus ground/ Frequency: 60HZ Output voltage: 120/208 VAC, 3 ph, 4 wire, plus ground. Main Input Circuit Breaker: Rated 125% of full load. B. Environmental Characteristics Temperature: 10 to 40C Relative Humidity: 10% - 70% Acoustic noise level: 60 db at 5 ft. (A scale) ***END OF SECTION 16409*** 16409-rev0 16409 - 2 December 2004 SECTION 16409 POWER DISTRIBUTION UNITS 16409-rev0 16409 - 3 December 2004