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#43439 - 10/14/04 05:56 AM Why not 2 grounding screws on receptacles?
chimo Offline
Member

Registered: 10/13/04
Posts: 14
All-

If you are wiring a series of outlets, and are allowed to use one set of screws for the line, and one set for the load, why do you have to pigtail the ground? I understand the ground screw is only rated for 1 conductor, so why don’t they make outlets with 2 ground screws? Wouldn’t this make for a safer connection (eliminating a possible weak connection with a wire nut?)

Thanks,

Chimo

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#43440 - 10/14/04 07:47 AM Re: Why not 2 grounding screws on receptacles?
Creighton Offline
Member

Registered: 01/06/02
Posts: 56
Loc: Hayward, CA
See 250.148. The continuity of the grounding conductors shall not be interrupted. First ground the box, then ground the receptacle to the box, so that removal of the receptacle willlnot interupt the grounding circuit.
Creighton.

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#43441 - 10/14/04 10:52 AM Re: Why not 2 grounding screws on receptacles?
Anonymous
Unregistered


If you are talking about a duplex receptacle you might think about it this way. Your wiring two individual receptacles and have the option to break the tabs to either half switch or wire with two different hots. Or, to break off both tabs and wire with two individual circuits / neutrals. either way your only grounding one strap or yoke.

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#43442 - 10/14/04 11:07 AM Re: Why not 2 grounding screws on receptacles?
earlydean Offline
Member

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
Grounding is so important that it cannot depend upon the device for it's continuity. Like Creighton said, first the continuity of the ground is assured, then you bond the receptacle to the grounding system via pigtails or jumpers. By the way, a wire nut is a superior connection, in my opinion. Although either, done correctly, is an excellent connection.
_________________________
Earl

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#43443 - 10/14/04 11:38 AM Re: Why not 2 grounding screws on receptacles?
chimo Offline
Member

Registered: 10/13/04
Posts: 14
Now I understand, continuity is the key. Which brings up one more question- In a duplex config., why only allow 1 conductor under the ground? If the grounds were twisted together, you would maintain continuity if the outlet was removed. Is it just a matter of solid contact between the wires & screw?

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#43444 - 10/14/04 03:15 PM Re: Why not 2 grounding screws on receptacles?
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
The basic rule is one wire per terminal, so that limits you to one wire under the screw. This rule applies to all terminals, not just equipment grounds.

Twisting the wires together is not recognized as a splicing method, you have to finish the job with a splicing device (such as a wire nut) or brazing, welding or soldering.
_________________________
Few things are harder to put up with than the annoyance of a good example.

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#43445 - 10/14/04 03:32 PM Re: Why not 2 grounding screws on receptacles?
golf junkie Offline
Member

Registered: 04/22/01
Posts: 511
Loc: York, NE
We pigtail all conductors, I thought that everyone did. It is not considered code compliant to run the full ckt. current through a device strap.

I don't know the code reference off the top of my head but that's the enterpretation here in Nebraska.

GJ

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#43446 - 10/14/04 04:04 PM Re: Why not 2 grounding screws on receptacles?
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
GJ,
 Quote:
It is not considered code compliant to run the full ckt. current through a device strap.

That will be news to UL as the listing says that you are permitted to use the device to splice the circuit conductors.
Don
_________________________
Don(resqcapt19)

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#43447 - 10/14/04 05:04 PM Re: Why not 2 grounding screws on receptacles?
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
I too splice all conductors, UL listed or not. Personnal quality / prefferance. (Not saying that those who do use the device terminals perform lesser quality work.) But I would have a kiniption if one of my guys does it, as I feel it sooner or later may become a call back for warrantee. And, I would defininatley hit the roof if it were done on a 3, or 4 wire circuit. This could subject the circuit to under/over voltage should the neutral fail. And, that may also be a code requirement for the 'grounded conductor', as well as the 'grounding conductor'. (I'm on my other computer and can't check now.)
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

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#43448 - 10/14/04 06:31 PM Re: Why not 2 grounding screws on receptacles?
electricman2 Offline
Member

Registered: 11/09/03
Posts: 234
Loc: Thomasville, NC USA
Pigtail is required for the grounded conductor if part of a multiwire circuit.
_________________________
John

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