What precautions or steps are needed when routing Schedule 40 PVC Electrical conduit across (90 degree crossing) a lightning prevention downlead? This downlead looks to be braided copper cable approximately 1/2" in diameter. Is there a specified distance between the PVC conduit and the downlead? For your consideration, I live in Philadelphia and I'm looking to install security lighting on a 20 amp circuit running on 12 gauge THHN.
Of all the homes I help oversee the construction of, the main thing that was followed when it comes to lightning protection is no sharp bends in the cable, or uphill runs. Always going down to ground. It can be run through walls, by means of drilled holes through the plates, so a close proximity of a non conductive PVC will be no problem. If you want to be safe, get a small gap between the conduit and the cable, though I think it does not need to be much say 1/2"to an 1". Since static electricity carries over the surface of the wire and not through the wire, which is the reason the cable is loosely braided, a little space between the two should suffice, just to be sure.