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Re: Grounding Antenna

Posted by Dave Kingsland on January 24, 2007 at 15:27:37

In Reply to: Re: Grounding Antenna posted by jcmusic on January 24, 2007 at 13:29:41:

Are you trying to be code compliant or just trying to do something reasonable? I believe the distance between the coax grounding block and a suitable grounding point is supposed to be within a certain limit, like 20 or 30 ft., and I know the grounding block is supposed to be located where the cable enters the house. Depending on how high the attic vent is, you may or may not be able to simultaneously satisfy both requirements. But even if it's not NEC compliant, tying the grounding block to the mast ground seems reasonable in this case.

The big issue is the ground rod. You can't just add another ground rod without connecting it to the existing grounding system - that's a major safety hazard. So you'll have to run another #6 or bigger ground wire from the ground rod to a suitable ground bonding point at the service entrance. A suitable bonding point includes the existing grounding electrode if it's accessible, a ground pigtail provided by the electrical utility at the meter can, metal conduit entering the service panel, or other options listed in the NEC. You _must_ do this for safety in the event of a nearby lightning strike or ground fault, and it should also help to prevent ground loop issues.

Dave

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