GFCI outlets on 2-wire systems?
- Thread starter staecker
- Start date
- Status
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: GFCI outlets on 2-wire systems?
Yes see 406.3(D), but start with 240.130(C) Nongrounding Receptacle Replacment or Branch Circuit Extensions.
Yes see 406.3(D), but start with 240.130(C) Nongrounding Receptacle Replacment or Branch Circuit Extensions.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: GFCI outlets on 2-wire systems?
If you check the TVSS you'll find it will work in normal and common mode: Normal is line to neutral, common is line & neutral to ground.
Yes installing a TVSS on a 2 wire GFCI does involve a trade off, you loose the protection to the equpipment grounding conductor (earth).
If you check the TVSS you'll find it will work in normal and common mode: Normal is line to neutral, common is line & neutral to ground.
Yes installing a TVSS on a 2 wire GFCI does involve a trade off, you loose the protection to the equpipment grounding conductor (earth).
physis
Senior Member
Re: GFCI outlets on 2-wire systems?
Tom,
Don't these supressors use identicle components (MOV, capacitor, coil) across each receptacle terminal making the existance of a ground connection irrelivant to it's operation?
I mean, it takes noise (from some frequency and up) and shunts it across whichever terminals it appears on.
It's sort of an interesting question, at least for me, is the ground a way for more noise to get in or to get out?
Tom,
Don't these supressors use identicle components (MOV, capacitor, coil) across each receptacle terminal making the existance of a ground connection irrelivant to it's operation?
I mean, it takes noise (from some frequency and up) and shunts it across whichever terminals it appears on.
It's sort of an interesting question, at least for me, is the ground a way for more noise to get in or to get out?
Re: GFCI outlets on 2-wire systems?
Thanks for the additional comments,
In looking at mfr's ad copy, it seems that the shunt solution providers say that their equipment, which requires a third (ground) wire, will take care of the common mode spike/surge. But unless you have an 8' copper rod driven into the ground right next to your computer/surge protector, that third wire could also be lifted by a surge/spike. Which is to say that the (3-wire) shunt-mode system can suffer from the same common mode problem as the (2-wire) series-mode system. Comments?
Thanks for the additional comments,
In looking at mfr's ad copy, it seems that the shunt solution providers say that their equipment, which requires a third (ground) wire, will take care of the common mode spike/surge. But unless you have an 8' copper rod driven into the ground right next to your computer/surge protector, that third wire could also be lifted by a surge/spike. Which is to say that the (3-wire) shunt-mode system can suffer from the same common mode problem as the (2-wire) series-mode system. Comments?
- Status