Ptx5000 Dc Power Electrical Safety Guidelines - Juniper PTX5000 Hardware Manual

PTX5000 DC Power Electrical Safety Guidelines

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Copyright © 2017, Juniper Networks, Inc.
The following electrical safety guidelines apply to a DC-powered packet transport router:
A DC-powered packet transport router that is equipped with a DC terminal block is
intended for installation only in a restricted access location. In the United States, a
restricted access area is one in accordance with Articles 110-16, 110-17, and 110-18 of
the National Electrical Code ANSI/NFPA 70.
NOTE: Primary overcurrent protection is provided by the building circuit
breaker. This breaker should protect against excess currents, short circuits,
and earth faults in accordance with NEC ANSI/NFPA70.
Incorporate an easily accessible disconnect device into the facility wiring. In the United
States and Canada, the –48 VDC facility should be equipped with a circuit breaker
(see "PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications"
on page 114 for details) in accordance with the National Electrical Code in the US and
the Canadian Electrical Code in Canada. Be sure to connect the ground wire or conduit
to a solid office (earth) ground. A closed loop ring is recommended for terminating the
ground conductor at the ground stud.
Each –48-VDC facility DC source input power cable connected to a 60-A DC PDU must
be equipped with a current-limiting fuse or circuit breaker (see,
PDU Electrical and External Circuit Breaker Specifications" on page 114
by local code). The voltage rating of the facility DC source circuit breaker must be 80
V minimum. We recommend an 80 A–rated circuit breaker or current-limiting fuse for
each 60-A DC power cable.
A DC-powered packet transport router is equipped with a DC terminal block that is
rated for the power requirements of a maximally configured packet transport router.
To supply sufficient power, terminate the DC input wiring on a facility DC source ((see
"PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications" on
page 114 for details) for the 60-A DC PDU.
Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate
gauge wire (see "PTX5000 AC and DC PDU Electrical and External Circuit Breaker
Specifications" on page 114
Site Electrical Wiring Guidelines on page 118
PTX5000 DC Power System Electrical Specifications on page 139
General Electrical Safety Guidelines and Warnings on page 609
Chapter 46: Electrical Safety Guidelines and Warnings
for details).
"PTX5000 AC and DC
or as required
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