This document describes the requirements and wiring instructions for a –48 VDC power
cable and safety ground wire for systems equipped with a –48 VDC power supply.
CAUTION: A qualified electrician must perform all connections to DC power and
safety grounds. The system must be safety grounded at the cabinet frame. All
electrical wiring must comply with applicable local or national codes and
practices.
CAUTION: The system chassis must be positively grounded to the rack cabinet
frame. Do not attempt to connect power to the system until grounding cables are
connected.
CAUTION: An energy hazard will exist if the safety ground cable is omitted or
disconnected.
Precaution Statements
This product is intended for restricted access locations (dedicated equipment rooms,
equipment closet, or the like) in accordance with Articles 110-5, 110-6, 110-11, 110-14, and
110-17 of the National Electrical Code, American National Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70.
Wire the unit with copper only, unless otherwise specified, 16 American Wire Gauge
(AWG) wire, and protect it with a 7.2-ampere (A) minimum to a 20-A maximum protective
device or a 25-A maximum protective device when used with 90ºC wire.
Connect the equipment to a –48 VDC supply source that is electrically isolated from the
AC source. Ensure that the –48 VDC source is efficiently secured to earth (ground).
CAUTION: When stranded wiring is required, use approved wiring termination,
such as closed-loop or spade-type with upturned lugs. These terminations should
be the appropriate size for the wires and must be double crimped, one on the
conductor and one on the insulation.
CAUTION: When installing the unit, the ground connection must always be made
first and disconnected last to prevent an energy hazard.
CAUTION: Never defeat the ground conductor or operate the equipment in the
absence of a suitably installed ground conductor. Contact the appropriate
electrical inspection authority or an electrician if you are uncertain that suitable
grounding is available.
Cabling Instr uct ions fo r t he –48 V D C
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