Dc Power Circuit Breaker Requirements For The Mx10003 Router; Dc Power Source Cabling For Mx10003 Router - Juniper MX10003 Hardware Manual

DC Power Circuit Breaker Requirements for the MX10003 Router

Each DC power supply has a single DC input (–48 VDC and return) that requires a dedicated circuit breaker.
We recommend that you use a dedicated customer-site circuit breaker rated for 40 A (–48 VDC) minimum,
or as required by local code. Doing so enables you to operate the router in any configuration without
upgrading the power infrastructure.
If you plan to operate a DC-powered router at less than the maximum configuration and do not provision
a 40 A (–48 VDC) circuit breaker, we recommend that you provision a dedicated customer-site circuit
breaker for each DC power supply rated for at least 125 percent of the continuous current that the system
draws at –48 VDC.
SEE ALSO
Routine Maintenance Procedures for MX10003 Routers | 116
Replacing an MX10003 DC Power Supply | 130
MX10003 Power Planning | 70
General Safety Guidelines and Warnings | 177
General Electrical Safety Guidelines and Warnings | 206
Prevention of Electrostatic Discharge Damage | 182

DC Power Source Cabling for MX10003 Router

The DC power supply in PS0 must be powered by a dedicated power feed derived from feed A, and the
DC power supply in PS1 must be powered by a dedicated power feed derived from feed B. This configuration
provides the commonly deployed A/B feed redundancy for the system.
CAUTION:
The power source cables might be labeled (+) and (–) to indicate their polarity. There
is no standard color coding for DC power cables. The 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 each power supply.
You must ensure that power connections maintain the proper polarity.
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