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#5441 - 11/19/01 09:50 PM 2 neut's under one set screw
gary long Offline
Member
Registered: 02/20/01
Posts: 32
Loc: Greeley,Colorado,USA
I know that some panel's say that this is allowed but I am against it. Two grounding conductor's is fine under one screw but two grounded conductor's under one screw will not work for me..I was putting this out there to see the response. " whyrag "
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#5442 - 11/20/01 04:31 AM Re: 2 neut's under one set screw
Joe Tedesco Offline
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Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
See the 2002 NEC, 408.21 Grounded Conductor Terminations.


[This message has been edited by Joe Tedesco (edited 11-22-2001).]
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#5443 - 11/20/01 01:36 PM Re: 2 neut's under one set screw
Tom Offline
Member
Registered: 01/01/01
Posts: 1044
Loc: Shinnston, WV USA
Gary,

I've not seen many panels that allow two grounded conductors under one screw. if you run across one & you only do one screw-one wire, more power to you since you have exceeded the minimum requirements of the NEC.

Wish I could have made the message icon a BIG thumbs up. Always glad to see a job that is better than the minimum.

Tom
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#5444 - 11/20/01 05:28 PM Re: 2 neut's under one set screw
sparky Offline
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Registered: 10/18/00
Posts: 5303
I'm having a bit of trouble with 408.21 EX , what is parrallel conductors in ref to?
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#5445 - 11/20/01 08:48 PM Re: 2 neut's under one set screw
Nick Offline
Member
Registered: 08/13/01
Posts: 599
Loc: Riverside, CA
Sparky,
Isn't that parallel runs as in 310-4?I would assume that because parallel conductors are considered electrically as one the hazards associated with disconnecting them when under one terminal goes away.
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#5446 - 11/21/01 03:39 AM Re: 2 neut's under one set screw
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
yes, ok...well it would be for bigger conductors. Let's say we have the the usual #12's etc, in a residential panel Is this cycle the end of placing a grounding & grounded ( N&G) under one screw? If so, will panel listings that allow this change?
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#5447 - 11/21/01 04:37 AM Re: 2 neut's under one set screw
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
Some of the exceptions to 310.4 could be considered also.
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#5448 - 11/21/01 11:48 AM Re: 2 neut's under one set screw
Tom Offline
Member
Registered: 01/01/01
Posts: 1044
Loc: Shinnston, WV USA
Got my new code book last night & I see that 2 neutrals under one screw is pretty much a thing of the past.

Now, if they would just eliminate 2 eq. grounds under 1 screw, I wouldn't have to worry about straining my eyes on all that tiny print.
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#5449 - 11/21/01 03:02 PM Re: 2 neut's under one set screw
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
I never looked that closely at panels while over there. Are most neutral busbar terminals the type where the end of the screw clamps down onto the wire inserted in a hole, or do they have flat plates clamped down on the wire by the screw like most receptacles?

Sparky:
I don't have a problem with the common neutral/ground busbar, but I'm not sure I like the idea of using the same screw for a branch cct. N & G. If the N & G stay connected firmly together (twisted maybe?) but the connection to the bar works loose while an appliance is connected the "ground" on that cct. is going to float right up to 120V.
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#5450 - 11/21/01 03:29 PM Re: 2 neut's under one set screw
Nick Offline
Member
Registered: 08/13/01
Posts: 599
Loc: Riverside, CA
Sparky,
According to Mike Holt this has been a UL listing requirement for many years. 408.21 is just making this a NEC requirement too. This way all of us in the general masses, who can’t afford to buy all UL’s literature, are aware of it’s existence.
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