Does anyone know that requirements for low voltage wiring. I have a situation where an exposed conduit with low voltage wiring reaches the top of grade surface at my pool vault. It runs the length of the surface for approximately 2 ft. I'm told low voltage needs to be buried 18 inches down. Is that for all forms of low voltage or only low voltage wires not incased in conduit?
If replying can you point me to the code number or page number of the NEC book?