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Re: Grounding Electrode Conductor #96457 01/03/06 02:41 PM
Joined: Apr 2004
Posts: 60
markp Offline
I wouldn't call it a splice either, but I think there may be some other issues. If each (or just one) wire from the panel to the pipe is sized per 250.66, then I see no problem. However, if these are GEC taps and a full size GEC was not run to the pipe, then I don't know if that meets the requirements of 250.64(D).

I see that the first 5' of a pipe can be an electrode, and used to bond other electrodes, but can that pipe be the full sized GEC itself and small taps from from it to panels?

Personally, I don't see why it can't be done this way, but I'm not sure this is permissible based on the definition of GEC. But running a short stub of #2 or 1/0 from that pipe and split bolting taps to it seems like a worse implementation.

Kent, WA
2017 / 2014 NEC & Related Books and Study Guides
Re: Grounding Electrode Conductor #96458 01/27/06 11:28 AM
Joined: Jul 2005
Posts: 56
Paul O'Connell Offline

First question I have is when did the utility start supplying a 400 Ampere meter enclosure? Second, are the lugs in the meter enclosure rated for more than 1 conductor? Based on the reply to these questions I think that the bonding requirements of 250-66 should be based on the 400 Ampere service as supplied by the utility. Expand on this and imagine 6 main breaker panels and a fire pump installed on this service. Knowing you I surely would not want to be the inspection after that one.

Re: Grounding Electrode Conductor #96459 01/27/06 06:47 PM
Joined: Apr 2001
Posts: 449
Fred Offline
Paul, What most sparkys call a 400A meterbase is what the PoCo calls a 320A self-contained meter base. They are usually provided with studs for mounting double barrel lugs to feed (2) 200A loadcenters w parrallel 2/0 CU or 4/0 AL but I have seen them with single 600kcmil lugs and 500kcmil CU feeding a 400A disconnect. 320A (80% of 400A)continuous is what the PoCo calls this single phase metering set-up and usually sets this size as the maximum for self-contained metering. Anything larger is usually current transformer metered.

Re: Grounding Electrode Conductor #96460 01/27/06 09:01 PM
Joined: Mar 2001
Posts: 2,056
Redsy Offline
Paul, Landis & Gyr makes a 320-amp continuous meter socket with single barrel lugs that are listed for 2 conductors.

Re: Grounding Electrode Conductor #96461 01/28/06 06:28 PM
Joined: Jan 2004
Posts: 1,507
George Little Offline OP
Paul- Fred pretty well covered it. Our utility company here is SE Michigan show the 400a can in the "Green Book" and it's for residential underground only (some exceptions). As for a fire pump, well, I've only been involved with one of them in residential. It was a group home and we taped ahead of the service panel for it.

George Little
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