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 donâ€™t they make outlets with 2 ground screws? Wouldnâ€™t this make for a safer connection (eliminating a possible weak connection with a wire nut?)
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.
Re: Why not 2 grounding screws on receptacles?#4344110/14/0401:52 PM
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.
Re: Why not 2 grounding screws on receptacles?#4344210/14/0402:07 PM
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.
Re: Why not 2 grounding screws on receptacles?#4344310/14/0402:38 PM
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?
Re: Why not 2 grounding screws on receptacles?#4344410/14/0406:15 PM
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
Re: Why not 2 grounding screws on receptacles?#4344810/14/0409:31 PM