Connecting Source Power to the Power Supplies
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
3-46

Connecting Source Power to a DC-Input Power Supply

In the following procedure, you are assumed to have a DC-input power supply already
installed in your router; you need to connect it to a DC power source. If a DC-input power
supply is not already installed, perform the procedures in the earlier section entitled
“Reinstalling the Power Supplies in the Router” before attempting to connect source DC
power to the unit.
If you equip your router with a single DC-input power supply, install it in the bottom power
supply bay.
Note An unoccupied power supply bay must have a power sup ply blank installed to ensure
EMI compliance and the proper flow of cooling air through the router.
Before attempting to connect your DC-input power supply to a DC power source, ensure
that your site meets the following requirements:
•DC power service—A dedicated 40A service must be available for each DC-input
power supply.
•Power cables (three per power supply)—The power cables must have the following
characteristics:
—Size—4 AWG (recommended)
—Diameter—0.204-inch (5.18-mm)
—Construction—High-strand-count copper wire
The length of the power cable depends on the location of your router wit hin the sit e and
the proximity of source DC power to the router.
•Power lugs (one for each of the three power cables)—The lugs for the power cables must
have the following characteristics:
—Contain dual holes centered 0.625-inch apart
—Be able to fit over M6 (metric) threaded terminal studs on the router faceplate
—Be made of copper (not aluminum) with electro-tin plating for corrosion resistance;
equivalent power lugs are acceptable