b. Slide the spade terminal of the positive wire (–48 V RTN) under the captive square washer on the
positive terminal (l).
SH
_
162
(+)
(–)
RTN
-48V
Figure 188: Connecting the Positive Power Wire to a –48V Source (450 W or
550 W DC Power Source)
6. Tighten both screws on the terminal block to 7 in
‑
lb (0.79 N m).
7. Snap the cover into place over the terminal block.
8. Connect the cables to the DC source voltage, using hardware appropriate to the installation site and
following local and national electrical codes.
9. Energize the DC circuit.
Leave the ESD strap permanently connected to the rack, so that the strap is always available when you
need to handle ESD-sensitive components.
You can now connect network interface cables to the switch, using the instructions in
Installing a 750 W Internal DC Power Supply
Caution
Make sure that the DC power supply circuit is not overloaded. Use proper overcurrent
protection, such as a circuit breaker, to prevent overcurrent conditions. You may use up to a
30-Amp breaker.
To install a 750 W DC power supply in a switch, perform the following tasks in the order listed:
1. Make sure you have the tools and materials you need.
Required Tools and Materials for Installing a 750 W DC Power Supply
on page 241.
Installing a 750 W Internal DC Power Supply
Installing Your Extreme Networks Switch
240 ExtremeSwitching Hardware Installation Guide
