Cabling The Power Input Module - Juniper ERX-1410 Installation And User Manual

4-4 CHAPTER 4
Cabling the ERX System

Cabling the Power Input Module

Lightning Activity Warning: Do not work on the system or connect or disconnect
cables during lightning activity.
DC Power Disconnection Warning: Before powering on the ERX system,
remove power from the DC circuit by deactivating the circuit breaker on the panel
board that services the DC circuit.
Servicing Unit Warning: Before servicing the ERX system, turn off the power.
Jewelry Removal Warning: Remove jewelry (including rings, necklaces, and
watches) before working on equipment that is connected to power lines. Metal
objects heat up when connected to power and ground and can cause serious
burns or weld the metal object to the terminals.
Metal Objects Warning: Do not insert any metal object, such as a screwdriver,
into an open slot or the backplane. Doing so may cause electric shock and serious
burns.
Note: If you plan on using a cable-management bracket, install it before you begin
cabling your ERX system. Cable-management brackets are helpful to keep
network interface cables untangled and orderly and to prevent cables from
hindering access to other slots.
Input power is supplied to the system by two redundant and independent
–48 VDC line feeds. If one line fails, the other can carry the full load of
the system. See Appendix A, System Specifications
requirements for the ERX system.
Table 4-1 identifies the power input module cabling requirements.
Table 4-1 Power input module cables/wires needed
Cable/Wire From
One 10-AWG Power input module ground
ground wire terminal
Two 10-AWG wire Power input module Power A
leads –48 VDC and RTN leads
Two 10-AWG wire Power input module Power B
leads –48 VDC and RTN leads
for the power
To
Termination ground
Appropriate leads on power
source No. 1
Appropriate leads on power
source No. 2