M40E Dc Power Distribution - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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M40e DC Power Distribution

280
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the terminal
studs on the circuit breaker box.
WARNING: For field-wiring connections, use copper conductors only.
For other electrical safety information, see "General Electrical Safety
Guidelines and Warnings Electrical Codes for M Series, MX Series, and T
Series Routers" on page 251.
CAUTION: Power cords and cables must not block access to router
components or drape where people could trip on them.
"M40e DC Power Distribution" on page 280 shows how to attach the power cables. The
power cables attach to the 1/4–20 UNC terminal studs located on the circuit breaker
box— the input set of studs is labeled
nuts and locking washers used to secure the power cable lugs on the terminal studs are
preinstalled on the studs.
The tool for loosening or tightening the nuts on the terminal studs is a 7/16-in.
hexagonal-head external drive socket wrench, or nut driver, with a torque range between
23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm).
Disconnecting and Connecting DC Power on the M40e Router
Replacing an M40e DC Power Supply on page 215
M40e DC Power Distribution on page 280
Most sites distribute DC power through a main conduit that leads to frame-mounted DC
power distribution panels, one of which might be located at the top of the rack that
houses the router. A pair of cables (one input and one return) connects each set of
terminal studs to the power distribution panel.
and the return set is labeled
–48V
Copyright © 2010, Juniper Networks, Inc.
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