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Power Requirements in a DC Environment
A Direct Current (DC) environment must supply 14 60-Amp feeds from the customer’s power source.
Each cabinet is divided into A and B power buses, each with seven feeds. If loss of power on one of
the buses occurs, the other bus must be able to supply current for the entire cabinet.
Note: The nominal voltage is -48VDC, and operating voltage range is -40VDC to -56.7VDC.
Note: The DC return terminal is not connected to the equipment frame or the grounding means of
the equipment, Isolated DC return (DC-I).
Note: If breakers are tripped, they must be switched completely OFF and then ON to reset.
Note: The size of the cable is determined by the overall length of the cable run. Refer to the Site File
Book.
Procedure — Power Terminations
All power terminations on the 3U PDP will be #6 awg. Use H-taps for each -48vdc and RTN run to
reduce the wire size to the proper gauge required.
Table 4-1 shows the list of required wiring sizes based on the length of the cable run. All cable equipment
power ratings are 125A @ -48VDC.
Table 4: Table 4-1. Power Cable Conductor Sizes
Conductor Size (AWG)
Cable Length
Breaker Size in
Amperes
#6
up to 40 ft. (12.2 meters)
40A
#4
up to 70 ft. (21.3 meters)
#2
up to 110 ft. (33.5 meters)
1/0
up to 170 ft. (51.8 meters)
2/0
up to 200 ft. (61 meters)
4/0
up to 220 ft. (67.1 meters)
#2
up to 40 ft. (12.2 meters)
60A
1/0
up to 70 ft. (21.3 meters)
2/0
up to 110 ft. (33.5 meters)
4/0
up to 170 ft. (51.8 meters)
350MCM
up to 200 ft. (61 meters)
350MCM
up to 220 ft. (67.1 meters)
64
910-5681-001 Revision E, February 2014
Cabinet Installation
Installation