Can I Mix High and Low Voltage Wiring?
Question. Can phone lines, fire alarm cables, and 120-240 cables be put together in an outdoor back box?
Besides the legal aspects which are fire and safety issues, there's the interference problem.
The voltages and currents from the 120-240 volt cables will be cross-talking to the low voltage cables. How much cross talk is produced will be affected by the actual currents in the high voltage cable, how tight they are to the low voltage cables, and the distance they are running together. The tolerance to this interference is a great issue, and depends on the signals used in the low voltage cable.
Unless you are prepared for major problems from all these issues down the road, I wouldn't recommend it under any circumstances.
Based on his electronics training, and his understanding of Life Safety, Douglas Krantz has compiled his knowledge of Conventional Fire Alarm Systems into the book Make It Work - Conventional Fire Alarms
. The book covers the basics of the Conventional Fire Alarm System, and shows how Life Safety and internal supervision affects the fire alarm system.
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