I understand that, according to NEC code, you need to ground both the coaxial cable and the antenna mast in a rooftop installation. I was curious as to why you need to ground both and not just the coax? My understanding is that there are 2 types of coax grounding mechanisms - a 'grounding block' which grounds the outer shield of the cable and a 'lightning arrestor' which grounds the central conductor of the cable. Do the NEC rules assume you are just using a grounding block and therefore don't have a way to stop a strike getting into the house via the center conductor? Or is grounding the antenna simply a way of taking some of the load off the coaxial cable in the event of a strike?
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3/6/12 at 1:04pm