Grounding seperate circuits together

[ty]

To comply with 250.148, the easiest way would be with a ground bus connected to the metal box.

You could not just wirenut the equipment grounding conductor to just its mate. You would need to splice ALL the equipment grounds together and then make a connection to the box.

Chris

I do not agree. I do not read the wording to say that.
250.148 does Not say 'they shall be connected together', it also says 'any' not 'ALL'.

If you were to bring 12/2 into a 2-gang Plastic box for a receptacle, and 14/2 into the same box for a switch, I do not read that to say all EGC's need to be connected togeter. In a metal box, they would be by default.

 

[infinity]

Are you saying that it is not OK to connect the EGC's to a ground bus attached to the 12X12 J-box?

Chris

You mean something like this:

 

[jxofaltrds]

I do not agree. I do not read the wording to say that.
250.148 does Not say 'they shall be connected together', it also says 'any' not 'ALL'.

If you were to bring 12/2 into a 2-gang Plastic box for a receptacle, and 14/2 into the same box for a switch, I do not read that to say all EGC's need to be connected togeter. In a metal box, they would be by default.

Read the exception in 250.148

 

[infinity]

Read the exception in 250.148

That exception references 250.146(D) which only applies to Isolated Ground circuits.

 

[jxofaltrds]

That exception references 250.146(D) which only applies to Isolated Ground circuits.

Thats my point.

 

[raider1]

This topic brings up another question. I need to run four 20 amp circuits through a 3/4 PVC conduit. I intend to pull an individual neutral for each circuit, going to a J-box in the attic, and branching out with NM from there. Is there a limit to how many circuits may share a single ground wire if i only pull one?

For multiple circuits with a common equipment grounding conductor take a look at 250.122(C).

Chris

 

[SPARKS40]

For multiple circuits with a common equipment grounding conductor take a look at 250.122(C).

Chris

So i take that as a yes??

 

[raider1]

So i take that as a yes??

You can pull a single EGC for 4 circuits provided that the EGC is sized for the largest overcurrent device of the 4 circuits.

Chris

 

[ty]

Read the exception in 250.148

I know what the exception says.

 

[LarryFine]

You could not just wirenut the equipment grounding conductor to just its mate. You would need to splice ALL the equipment grounds together and then make a connection to the box.

I believe you could do it either way, as long as the box is bonded via, and to, an EGC sized for the largest circuit in the box.

 

[infinity]

I believe you could do it either way, as long as the box is bonded via, and to, an EGC sized for the largest circuit in the box.

I always felt the same way but found some other's opinions that didn't agree with me.