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6 Pelco Manual C456M-D (1/98)
3.0 INSTALLATION
3.1 SUSPENDED CEILING
1. Remove the ceiling tile from the ceiling. If you are installing the back box into a
2' x 4' (61 x 122 cm) ceiling grid, cut the tile in half and install an additional “T”
bar for support. Reinstall one of the 2' x 2' (61 x 61 cm) sections.
2. Bring the wiring to the back box opening in the ceiling.
• Video - Refer to Table A for the type of video coaxial cable to use.
• Power - If the input power to the dome is 24 VAC, refer to Table B to
determine the size of wire to use. The power requirement is 48 vA.
• Control - If you are using a Coaxitron
®
controller, the control signals to
operate the dome drive will be transmitted over the video coax.
If you are not using a Coaxitron
®
controller, bring wires to the back box
for two RS-485 control lines (RX+ and RX-).