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Installing and wiring telephone power supplies
114 Installing and Connecting the MDF and Telephones
Installing the wall-mounting plates
The top plate is used for mounting the back-up battery. The bottom plate is used to mount the
power supply and distribution units. The plates can be rack-mounted using standard
rack-mounting brackets. See Figure 52: 1145B2/1146B2 mounting arrangement
on page 112.
To install the wall-mounting plates:
1. Locate one plate directly below the other one such that the AC power cord (6.5 feet
[2 meters]) reaches the electrical outlet from a power supply mounted on the bottom plate.
Both plates should be located so the raised letters are right side up.
Note:
Note: A maximum of four power supplies can be powered from one dedicated 110 VAC,
20 amperes (or 230 VAC, 15 amperes) feeder. Use only nonswitched outlets
(outlets not connected to a wall switch).
2. Secure the wall mounting plates to a standard 3/4-inch (2 centimeters) thick plywood
mounting board. Each mounting plate comes with four #10 x 1/2-inch wood screws.
3. The 1145B2 Power Supply is snap-fit onto the bottom wall mounting plate without tools.
4. An installer-provided insulated ground wire, 16 AWG (#12) (1.2 square millimeters) or
greater, is required to connect the power supply frame ground lug to an approved ground.
The frame ground screw is located next to the AC outlet, to the left of the unit.
Mounting the 1146B2 Power Distribution Unit
See the 1146B2 Power Distribution Unit in Figure 53: Expanded power distribution unit on
page 113. To mount the 1146B2 Power Distribution Unit:
1. Insert and securely tighten the two supplied #8-32 x 1/2-inch shoulder screws (they have an
unthreaded section at the top) into the top holes designated for 1146B2 Power Distribution
Unit on the bottom plate. Mount the unit on these two shoulder screws, using the key holes
on the back of the unit.
2. Secure the unit by inserting the #8-32 x 1-inch screw through the bottom of the unit (just
above the wire clips) into the plate and tighten.
3. Set the battery back-up switch option to the 1-32 (down) position to provide battery back-up
to all outputs.
4. Connect the power distribution unit to the power supply with the power cable. See the
power supply’s right-hand label to locate the output power connection.