The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 393 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#77361 - 05/24/01 04:58 PM Grounded bar terminal screws
binky178 Offline
Junior Member

Registered: 05/24/01
Posts: 1
Loc: covington
My friend and I have been discussing(arguing) about how many wires can be under a screw according to code. He thinks two but I remember hearing or seeing a change that said you were only allowed one. Would appreciate some help on this one and the code section it's in.

2014 / 2011 NEC & Related Books and Study Guides
#77362 - 05/24/01 05:40 PM Re: Grounded bar terminal screws
sparky Offline

Registered: 10/18/00
Posts: 5545
Hi binky178 !
I would have to say 110-3, as this would be a listing/rating Q.
I'm sure others can comment on this here.

#77363 - 05/24/01 08:29 PM Re: Grounded bar terminal screws
sparky66wv Offline

Registered: 11/17/00
Posts: 2334
Loc: West Virginia
GE, Cutler-Hammer and Murray Residential Load Centers allow 2 #12 Conductors in each lug, at least in the panels I've bought. It would be a listing/labeling thing as far as I'm aware... Not sure about Sq D...


#77364 - 05/24/01 08:43 PM Re: Grounded bar terminal screws
Bill Addiss Offline

Registered: 10/07/00
Posts: 4196
Loc: NY, USA

You could both be right. (how's that for diplomacy? ) The answer would be one unless specifically allowed by the listing/labelling info that went with that piece of equipment. I thought I saw once that some panels would allow up to 3 grounds per terminal. Not sure about that though.


#77365 - 05/24/01 09:10 PM Re: Grounded bar terminal screws

Be careful if the conductors need to be the same gage and solid before being paired under a screw.

#77366 - 05/25/01 05:25 AM Re: Grounded bar terminal screws
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Most load centers have this info. on a sticker inside the enclosure door.Typically, 2 ground wires of the same size, but only one neutral. How many times have we seen(and done) the neutral and its ground in the same bus hole. Probably a violation. Breakers, also. The set screw type typically accomdate only one. Some of the others (Square D) have a pressure plate under the screw head that will take one wire on each side of the screw. As far as wiring devices, one screw, one wire.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals