Juniper EX8208 Hardware Manual page 178

WARNING:
or drape where people can trip on them.
NOTE: To supply sufficient power to an EX8208 switch, terminate the DC input wiring on
a facility DC source that is capable of supplying a minimum of 60 A at –48 VDC.
To supply sufficient power to an EX8216 switch, terminate the DC input wiring on a facility
DC source that is capable of supplying a minimum of 100 A at –48 VDC.
NOTE: A 2000 W DC power supply requires a dedicated 60 A circuit breaker for each input
DC feed.
A 3000 W DC power supply requires a dedicated 100 A circuit breaker for each input DC
feed.
NOTE: Each power supply input feed must be connected to a dedicated DC power source
outlet.
7. Install each power cable lug on the DC power input terminal, securing it first with a locking washer,
then with the nut (see
of torque to each nut. (Use the 3/8-in. [9.5 mm] nut driver or socket wrench.)
a. Secure each positive (+) DC source power cable lug to the RTN (return) DC power input terminal.
b. Secure each negative (–) DC source power cable lug to the –48V (input) DC power input terminal.
Each power supply has two independent sets of DC power input terminals (A: –48V A: RTN and B:
– 48V B: RTN ). For feed redundancy, each power supply should be powered by dedicated power feeds
derived from feed A and feed B. This configuration provides the commonly deployed A/B feed
redundancy for the switch.
NOTE: If the power cord tray is installed, you can thread the DC power cables through the
power cord tray.
Ensure that the power cables do not block access to switch components
Figure 53 on page 179). Apply between 29 in.-lb (3.3 Nm) and 31 in.-lb (3.5 Nm)
178