EMT into plaster wall. Exceptable?

[Joe Cool]

Hello and good day.

My daughter wants to have a plaster wall repaired.
The dry waller said the outlets need repair
and that new wiring could be trenched into the plaster
and he would dry wall over that.
I'm thinking that the new wire would have to at least be notched into
the wall studs and protected by nail plates at each stud.
Or can 1/2 inch EMT be run directly under the dry wall
without going through the studs?

Thanks for your time.

 

[dkidd]

(B) Type NMC. Type NMC cable shall be permitted as
follows:

(3)In a shallow chase in masonry, concrete, or adobe protected
against nails or screws by a steel plate at least
1.59 mm (1⁄16 in.) thick and covered with plaster,
adobe, or similar finish

You can use AC or MC.

 

[Joe Cool]

2 conductor NM w/o Ground

2 conductor NM w/o Ground

Thanks.

I have another question concerning the same project.

The old NM type cable with only 2 conductors and no ground...

If receptacles are replaced, they must "not" have a ground terminal
or they must be replaced with a GFCI or GFCI protected.

Is that still correct according to NEC?

Also have another question... A friend of my wife's had the old 2 conductor type cable
and no grounded receptacles. The electrician ran pieces of Green 12AWG THHN out
of the panel and stapled them along the joists in the basement. Then fished them into
the receptacles in the wall so she could have grounded receptacles.

Is that acceptable to NEC? I've never seen that done before.

 

[SCelectrician]

Thanks.

I have another question concerning the same project.

The old NM type cable with only 2 conductors and no ground...

If receptacles are replaced, they must "not" have a ground terminal
or they must be replaced with a GFCI or GFCI protected.

Is that still correct according to NEC?

Also have another question... A friend of my wife's had the old 2 conductor type cable
and no grounded receptacles. The electrician ran pieces of Green 12AWG THHN out
of the panel and stapled them along the joists in the basement. Then fished them into
the receptacles in the wall so she could have grounded receptacles.

Is that acceptable to NEC? I've never seen that done before.

Both questions pretty much go hand in hand. Look at 250.130(B) of the NEC. "For replacement of non-grounding-type receptacles with grounding-type receptacles and for branch-circuit extensions only in existing installations that do not have an equipment grounding conductor in the branch circuit, connections shall be permitted as indicated in 250.130(C)"

But honestly I've never quite understood why. If your going to to take the time and pull a ground wire, why not just pull a new wire?

Edit: 250.130(C) lays out the criteria for nongrounding receptacle replacement. fyi

 

[electrofelon]

(B) Type NMC. Type NMC cable shall be permitted as
follows:

(3)In a shallow chase in masonry, concrete, or adobe protected
against nails or screws by a steel plate at least
1.59 mm (1⁄16 in.) thick and covered with plaster,
adobe, or similar finish

You can use AC or MC.

Good luck finding NMC anywhere.....

 

[jusme123]

...//

 

[readydave8]

If your going to to take the time and pull a ground wire, why not just pull a new wire?

That's what I've always said, but in the last few years I have had situations where I did not want to re-wire an entire circuit, only get a ground to several receptacles. I have put new romex to new grounded receptacle next to old one, and I have left old conductors in box and fed recep with new romex, but there have been a few times when it was much faster and easier just to pull in a green.