Power supply installation Standard 1.0
50 CallPilot
Bringing power and ground into the PDU
Introduction
Install BAT/BATRTN wires in pairs. Each pair of wires supplies voltages t o
a module through a power harness. The module harnesses are installed in the
cabinet PDU and connected to the modules at the factory.
See “About the Power Distribution Unit” on page 48 for a PDU wiring
diagram and description.

To bring DC power and ground into the PDU

1If you are using a conduit, terminate the 1-1/4 or 3/4 conduit at the top
rear of the cabinet or at the bottom front of the cabinet using the
knockouts provided.
The number of wire pairs you can run in each conduit depends on the
wire gauge.
Note: To preserve ground integrity, the conduit must be insulated.
2Select a power feed with a circuit breaker dedicated to each module, and
identify it with an appropriate tag.
3Select a wire size to suit the required feed length from the power source
(see “DC wire gauge tables” on page 44).
4Use pliers to strip one-quarter to one-half of the insulation from one end
of all power and ground feed wires.
5Undo the terminal block screws at (-) positions 0, 1, 2, and 3.
6Insert the red wires into terminal block positions 0, 1, 2, and 3.
7Secure the wires in the terminal block by tightening the screws.
8Undo the terminal block screws at (+) positions 0, 1, 2, and 3.
9Insert the black wires into terminal block positions 0, 1, 2, and 3.
10 Secure the wires in the terminal block by tightening the screws.