Dc Power Source Cabling For The Srx5800 Services Gateway; Figure 72: Typical Dc Source Cabling To The Services Gateway - Juniper SRX5800 Hardware Manual

SRX5800 Services Gateway Hardware Guide
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DC Power Source Cabling for the SRX5800 Services Gateway

138
per supply) @ –48 VDC (nominal) for the system. This is maximum current draw at –48
VDC when two power supplies are providing the power to the system and the redundant
power supplies are not supplying power or not present. Use a customer site circuit breaker
rated according to respective National Electrical Code and customer site internal
standards to maintain proper level of protection for the current specified above.
If you plan to operate a DC-powered services gateway at less than the maximum
configuration, we recommend that you provision a circuit breaker according to respective
National Electrical Code and customer site internal standards to maintain proper level
of protection for the current specified above or each DC power supply rated for at least
125% of the continuous current that the system draws at –48 VDC.
SRX5800 Services Gateway DC Power Supply Specifications on page 135
Calculating Power Requirements for the SRX5800 Services Gateway on page 107
DC Power Source Cabling for the SRX5800 Services Gateway on page 138
DC Power Cable Specifications for the SRX5800 Services Gateway on page 136
DC Power Cable Lug Specifications for the SRX5800 Services Gateway on page 137
Figure 72 on page 138 shows a typical DC source cabling arrangement.

Figure 72: Typical DC Source Cabling to the Services Gateway

The DC power supplies in slots
feeds derived from feed A, and the DC power supplies in slots
powered by dedicated power feeds derived from feed B. This configuration provides the
commonly deployed A/B feed redundancy for the system.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables. The
PEM0 and PEM1 must be powered by dedicated power
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and must be
PEM2 PEM3
and to indicate
(+) (–)