M10I Dc Power Electrical Safety Guidelines And Warnings; M10I Dc Power Electrical Safety Guidelines - Juniper M10i Hardware Manual

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M10i DC Power Electrical Safety Guidelines and Warnings

Copyright © 2010, Juniper Networks, Inc.
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Appendix A: Safety and Regulatory Compliance Information for the M10i Router
M10i DC Power Electrical Safety Guidelines on page 173
DC Power Electrical Safety Warnings for M Series, MX Series, and T Series
Routers on page 174

M10i DC Power Electrical Safety Guidelines

The following electrical safety guidelines apply to a DC-powered router:
A DC-powered router is equipped with a DC terminal block that is rated for the power
requirements of a maximally configured router. To supply sufficient power, terminate
the DC input wiring on a facility DC source capable of supplying at least 31 A @ –48 VDC
per input for each power supply.
Incorporate an easily accessible disconnect device into the facility wiring. We
recommend that the 48 VDC facility DC source should be equipped with a circuit
breaker rated at 40 A (–48 VDC) minimum, or as required by local code. In the United
States and Canada, the 48 VDC facility should be equipped with a circuit breaker rated
a minimum of 125% of the power provisioned for the input in accordance with the
National Electrical Code in the US and the Canadian Electrical Code in Canada.
Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate
gauge wire to handle up to 50 A.
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.
A DC-powered router that is equipped with a DC terminal block is intended only for
installation 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.
Ensure that the polarity of the DC input wiring is correct. Under certain conditions,
connections with reversed polarity might trip the primary circuit breaker or damage
the equipment.
For personal safety, connect the green and yellow wire to safety (earth) ground at both
the router and the supply side of the DC wiring.
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