User's Manual

VS-600 Resident Unit Manual C-3
C.2 Powering Dome Lights
The T3-PSU-4 external Power Supply Unit is a 24VDC, 4A continuous power supply able to
power multiple dome lights. The PSU is connected to the Resident Units using a 1-pair 18-gauge
stranded cable, with no shield (West Penn 224 or equivalent).
Each NC1-LD3 dome light draws 90 mA. Use the chart below to determine home many Power
Supply Units are required for the number of Resident Units.
Dome Lights PSUs
1-44 1 PSU
45-88 2 PSUs
89-133 3 PSUs
Note: Line loss may be a factor depending on the distance between Resident Units and PSUs. If the
wiring length between the devices is great, an additional PSU may be required.