Table of Contents
Advertisement
Installation
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
Breaker Size in
Amperes
40A
60A
910-5681-001 Revision E, February 2014
Cable Length
up to 40 ft. (12.2 meters)
up to 70 ft. (21.3 meters)
up to 110 ft. (33.5 meters)
up to 170 ft. (51.8 meters)
up to 200 ft. (61 meters)
up to 220 ft. (67.1 meters)
up to 40 ft. (12.2 meters)
up to 70 ft. (21.3 meters)
up to 110 ft. (33.5 meters)
up to 170 ft. (51.8 meters)
up to 200 ft. (61 meters)
up to 220 ft. (67.1 meters)
Cabinet Installation
Conductor Size (AWG)
#6
#4
#2
1/0
2/0
4/0
#2
1/0
2/0
4/0
350MCM
350MCM
64
Advertisement
Table of Contents
