[miamicuse]

If I have a two wire conductor no ground feeding a receptacle on one branch circuit, and in the same junction box I have a 12-2 nmB on another branch circuit passing through to a feed a microwave oven, is there any reason I cannot splice to that circuit's ground conductor to connect to the receptacle's ground screw?


Junction box is metal and both branch circuits originate from the same panel enclosure.

 

[anyacolo]

yes its fine,


ground it to the box also

 

[seharper]

Ground, yes, yes, yes, as of NEC 2014.

Make sure that ground wire actually does go back to the panel! Otherwise you just create an island of grounds that does not improve safety, and hurts it.

Neutrals, no no never.

 

[miamicuse]

Ground, yes, yes, yes, as of NEC 2014.

Make sure that ground wire actually does go back to the panel! Otherwise you just create an island of grounds that does not improve safety, and hurts it.

Neutrals, no no never.

Yes I understand neutrals are dedicated for each circuit.


I do have the ground continuity back to the panel. My last 3 houses were all EMT conduits and metal boxes acting as EGC and except for a bathroom tub pump requiring a dedicated ground conductor I could just connect to the box with the ground conductor and be done with it.

 

[seharper]

Yup, EMT is awesome. My whole world is EMT (and commercial therefore 12 AWG minimum). I own 10 colors of #12 wire. Green is not among them.

 

[miamicuse]

Yup, EMT is awesome. My whole world is EMT (and commercial therefore 12 AWG minimum). I own 10 colors of #12 wire. Green is not among them.

I love EMT. Such a joy to rewire and re-purpose. This is the first house I own that is not EMT and has 80% romex and 20% old cloth wiring. It's such a pain to work.


Replacing a wire in the crawlspace you have to basically crawl down there and refish everything.


The attic has low to no headroom you have to break the ceiling in strategic places.


Even a simple thing like needing a 12-3 to operate a ceiling fan, finding only a 12-2 from the switch to the wall, and not wanting to rely on pull chains or flaky remotes, I have to break the wall and the ceiling to run a new 12-3, walls that are plaster and lath probably with abestoes paint. Never issues like that with EMTs.