Operating instructions

SAFETY: Equipment Using -48V DC Power Supplies
Systems using -48V DC Power Supplies are 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.
• Connect the equipment to a 48-V direct current (DC) supply source that is electrically
isolated from the AC source. The 48VDC source is to be reliably connected to earth.
CAUTION: A qualified electrician must perform all connections to DC
power and to safety grounds. All electrical wiring must comply with
applicable local or national codes and practices.
CAUTION: Before connecting safety ground or power cables to the
connector, ensure that the power is removed from the DC circuit. To ensure
that the power is off, locate the circuit breaker on the DC source circuit
(usually at the power distribution of the battery distribution fuse bay).
Switch the circuit breaker to the off position and, if available, install an
approved safety locking device on the circuit breaker or switch.
CAUTION: While grounding techniques may vary, a positive connection to a
safety (earth) ground is a requirement.
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.
CAUTION: The system chassis must be securely grounded to the rack
cabinet frame. Do not attempt to connect power to the system until
grounding cables are connected. Completed power and safety ground wiring
must be inspected by a qualified electrical inspector. An energy hazard will
exist if the safety ground cable is omitted or disconnected.
• Wire the unit with copper wire only, and unless otherwise specified, use 14 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.
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.