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Re: 1200A service 3 400A disco where is point of service #99535 08/11/06 08:14 PM
Joined: Apr 2004
Posts: 60
markp Offline
crl22191 wrote: it seems they indicate completely different points of bonding the neutrals and grounds, the first in the trough, the second in the individual disconnects.

Why is this difficult? The neutral wire is the bonding wire at all places along the service until you hit the main disconnect(s). Your neutral will be bonded the chassis in the meter enclosure, the trough, and in both disconnects. The trough is not a disconnect, so there is no need to isolate the grounded and grounding wires yet. The GEC is attached to the neutral in the trough because it is the only neutral large enough in this example. If a larger neutral (2/0) was run to one of the disconnects, the GEC could have been connected there which may make people feel more comfortable.

Yes, there will be current flowing in the metal service raceways, troughs, and enclosures, but this is how most service equipment is.

Kent, WA
2017 / 2014 NEC & Related Books and Study Guides
Re: 1200A service 3 400A disco where is point of service #99536 08/11/06 08:49 PM
Joined: Jul 2004
Posts: 9,412
gfretwell Offline
If you are at an IAEI metting you will always find several guys who say "parallel neutral" when you talk about bonding the neutral and have metal paths. I agree it isn't really very important in cases like this.

Greg Fretwell
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