![]() |
| Powered by phpBay Pro |

How do I connect old 2-conductor circuits into modern 3-conductor wiring (with third wire ground)?
I'm moving an electrical junction box that was installed by an electrician. Generally I assume an electrician does things right, but I'm suspicious about something he did in this box I'm moving.
The box has modern 3-conductor (NMB 12-2 Romex, which is 2-wire plus a third wire bare dedicated ground) run to it from the circuit breaker. The box junctions this with an old circuit that is two conductor with no ground.
The way the electrician did this was to tie the white (neutral) wire in the old 2-conductor cable to both the white (neutral) and bare (ground) wires in the new 3-conductor. Obviously, black (hot) was tied to black.
Now, I would have thought to dead-end the third wire (bare ground) to the (metal) box, and to just connect black to black and white to white. I thought you weren't supposed to connect dedicated third-wire ground with the neutral return wire, even though they're both grounded eventually. What should be done in this situation?
You need to take the ground wire off the neutral wire connection in the junction box. The big problem is, you now have parallel wires carrying the neutral current back to the panel. Anyone disconnecting that ground wire in the panel could get electrocuted, not knowing it is carrying current. The ground wire should never carry current except to clear a ground fault (short circuit). You are correct to dead end the ground wire at the junction box. The rest of the circuit will simply be a two wire circuit with no ground, as it is now. Good catch.
![]() |
![]() 20Cable Wire Clips Ties Tidy Up Kit Loose Lead 4mCWS US $199.00
|
![]() 100 48 175lb Nylon wire cable zip tie ties white US $188.69
|
![]() 100 48 175lb Nylon wire cable zip tie ties black US $188.69
|
![]() NEW 250 PACK PANDUIT BT4LH TL0 WIRE CABLE TIES 14 7 8 LENGTH US $149.99
|
![]() 100 40 250lb Nylon wire cable zip tie ties black US $146.27
|
![]() 100 46 175lb Nylon wire cable zip tie ties white US $144.88
|
![]() 5000 PCS 14 White Nylon Cable Wire Zip Ties 50 Lbs US $125.00
|
![]() 2000 COUNT BLACK PLASTIC 8 WIRE WRAP CABLE ZIP TIES CT8 US $124.99
|
![]() 100 33 stainless steel wire cable ties 031 width US $124.61
|
![]() 500pcs Black Nylon Cable Wire Ties 48mm450mm 50 Lbs US $99.99
|
![]() 1000pcs White Nylon Cable Wire Ties 48mm300mm 50 Lbs US $99.99
|
![]() 1000pcs White Nylon Cable Wire Ties 48mm280mm 50 Lbs US $99.99
|
![]() 500pcs Black Nylon Cable Wire Ties 48mm430mm 50 Lbs US $99.99
|
![]() 500pcs White Nylon Cable Wire Ties 48mm430mm 50 Lbs US $99.99
|
![]() 500pcs White Nylon Cable Wire Ties 48mm450mm 50 Lbs US $99.99
|
![]() 2000pcs Black Nylon Cable Wire Ties 36mm200mm 40 Lbs US $89.99
|
![]() 2000pcs Black Nylon Cable Wire Ties 48mm120mm 50 Lbs US $89.99
|
![]() 2000pcs White Nylon Cable Wire Ties 48mm120mm 50 Lbs US $89.99
|
| Powered by phpBay Pro |


US $999.00












































































