Audio cable and video cable is not a common wire
Cable pipe buried laying is not need to do lightning protection grounding (steel pipe itself has been grounded), you see from that drawing through the laying of flat steel or round steel, such as the need to ground, steel pipe itself is Conductor, as long as the joints at the junction of welding on the line, so PVC pipe do not need to do.
If you can, if the steel pipe and the grounding network can be connected to your pvc how even ah reason is very simple ah, pvc non-conductive! The The
Cable to wear steel pipe laying is not particularly need to do mine grounding, the construction as long as the steel pipe joints with a special fixture connected to the steel pipe, and then use the jumper on both sides of the fixture to connect the steel pipe and electrical box Connection, electrical box to do lightning protection grounding. If it is PVC pipe do not need to do. But now I have not seen with PVC pipe buried.
