ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
New tool
by gfretwell - 10/19/20 03:43 PM
Where is Everyone?
by Bill Addiss - 10/17/20 07:04 PM
Beyond Belief
by gfretwell - 09/27/20 12:03 AM
Questioning the electrical norms
by LongRunner - 09/23/20 06:38 AM
Smoke & mirrors?
by HotLine1 - 09/21/20 03:42 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
1 registered members (Scott35), 23 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
2 neut's under one set screw #5441 11/20/01 01:50 AM
Joined: Feb 2001
Posts: 32
G
gary long Offline OP
Member
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 "

Work Gear for Electricians and the Trades
Re: 2 neut's under one set screw #5442 11/20/01 08:31 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
See the 2002 NEC, 408.21 Grounded Conductor Terminations.


[This message has been edited by Joe Tedesco (edited 11-22-2001).]


Joe Tedesco, NEC Consultant
Re: 2 neut's under one set screw #5443 11/20/01 05:36 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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


Few things are harder to put up with than the annoyance of a good example.
Re: 2 neut's under one set screw #5444 11/20/01 09:28 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
I'm having a bit of trouble with 408.21 EX , what is parrallel conductors in ref to?

Re: 2 neut's under one set screw #5445 11/21/01 12:48 AM
Joined: Aug 2001
Posts: 599
N
Nick Offline
Member
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.

Re: 2 neut's under one set screw #5446 11/21/01 07:39 AM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
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? [Linked Image] If so, will panel listings that allow this change?

Re: 2 neut's under one set screw #5447 11/21/01 08:37 AM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline
Member
Some of the exceptions to 310.4 could be considered also.


Joe Tedesco, NEC Consultant
Re: 2 neut's under one set screw #5448 11/21/01 03:48 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
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.


Few things are harder to put up with than the annoyance of a good example.
Re: 2 neut's under one set screw #5449 11/21/01 07:02 PM
Joined: Aug 2001
Posts: 7,520
P
pauluk Offline
Member
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. [Linked Image]

Re: 2 neut's under one set screw #5450 11/21/01 07:29 PM
Joined: Aug 2001
Posts: 599
N
Nick Offline
Member
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.

Page 1 of 2 1 2

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Top Posters(30 Days)
BigB 3
Popular Topics(Views)
270,691 Are you busy
204,933 Re: Forum
193,045 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3