the DC power supply. This section provides information about DC power specifications to be used in
connecting the DC cable to the DC source voltage.
Wiring the DC power cord to your facility DC source voltage must be performed by a qualified, licensed
electrician. After the DC power cord is connected to a permanent DC voltage source by a qualified,
licensed electrician, you can remove, replace, and maintain the 1200 W DC power supply without further
electrician assistance. However, make sure that the DC circuit is de-energized before connecting or
disconnecting the DC power cord on power supply.
All wiring methods involving the DC input cable assembly must be performed according to the relevant
articles of the National Electrical Code.
Figure 58: Input DC Power Cable for the 1200 W DC Power Supply
1 = Return
4 = Black: Return
2 = -48V DC
5 = Blue: -48V
3 = Ground
6 = Green/yellow: Ground
Each 1200 W DC power supply must be powered by a 50 A dedicated power source that delivers -40 to
-72 V DC of constant power. Power distribution to the 1200 W DC power supply shall be provided using
the -48 V DC harness provided. Power to the 1200 W DC power supply can be from either a 50 A UL-
approved overcurrent protection breaker or an SELV- approved power source in accordance with IEC
60950-1 utilizing 50 A overcurrent protection.
The input DC cable has an input connector on one end and precut wire on the other end that goes to
the DC power source. The input connector has a locking mechanism that locks onto the DC power
supply to prevent accidental removal of the input DC cable.
If necessary, use appropriate termination lugs for 8 AWG (10 mm2) copper-stranded wire on the ends of
the cable to connect to the DC power source.
The blue termination (-48 V) connects to a 50 A overcurrent protection circuit device, and the black
(return) termination connects directly to the RTN bus of the DC power source. The green/yellow
termination (ground) must connect to the same earth ground point as the switch.
Installing a 1200 W DC Power Supply
Caution
Be sure that the grounding pad on the back of the switch chassis is securely connected to
earth ground. For information about grounding the switch, see
Grounding the BlackDiamond
8800 Series Chassis
on page 74.
To install an Extreme Networks 1200 W DC power supply:
Installing Power Supply Units (PSUs)
BlackDiamond 8800 Hardware Install Guide
83