So, you are hanging a receptacle on a tower. 30 amp 10 gauge. You want a 4 gauge ground? I understanding bonding the tower to a common bond point with a large gauge wire. But the three wires run in some liquidtite or conduit can be smaller. How about only hot and neutral inside EMT. If the only goal is to get a safe receptacle at the top of the tower I would thing that would suffice as long as the tower itself is bonded properly. No?
From: Mike Hammett Sent: Wednesday, April 15, 2015 2:03 PM To: [email protected] Subject: Re: [AFMUG] Electrical - Grounding question - long run Amperage is irrelevant, well, unless it's larger than the gauge I recommended. It's not an inside-home outlet, but bonding the ground between the electrical service and the equipment\tower. You don't want your tower ground to be better than your electrical service ground and have a surge decide the best path is through the electric (+ or neutral) and thus your equipment. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "Chuck McCown" <[email protected]> To: [email protected] Sent: Wednesday, April 15, 2015 3:01:06 PM Subject: Re: [AFMUG] Electrical - Grounding question - long run For a 30 amp circuit? From: Mike Hammett Sent: Wednesday, April 15, 2015 1:58 PM To: [email protected] Subject: Re: [AFMUG] Electrical - Grounding question - long run Your ground should be at least 4 gauge, maybe even larger than that. One of the 0/x gauges is in my mind for some reason. That should bond the electrical ground with all tower and equipment grounds. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "Paul McCall" <[email protected]> To: [email protected] Sent: Wednesday, April 15, 2015 2:41:15 PM Subject: [AFMUG] Electrical - Grounding question - long run In my continued disposition of acknowledging that I am not a electrical grounding expert, I lay out this scenario for review, a new tower we just built. We installed a new tower, approximately 200ft. from the service panel that feeds it. We will be on our own breaker (kinda irrelevant here). In the past, we had run 10 gauge wire (x3) out to the tower with 110vac. Voltage drop is relatively negligible, certainly within the bounds of working properly to drive our 24v charger for the battery array. I was told, by a grounding “expert” that all my equipment electrical grounds need to homerun to a bus bar that ride the ground back to the service panel directly, that nothing else is acceptable. AND, and this is the big part… that I needed to seriously upgrade the 200ft. ground wire only that rides back to the panel to something significantly bigger. How much bigger I am not sure. So, I figured I would ask the crowd for an answer J Thanks! Paul McCall, Pres. PDMNet / Florida Broadband 658 Old Dixie Highway Vero Beach, FL 32962 772-564-6800 office 772-473-0352 cell www.pdmnet.com [email protected]
