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miamicuse 06-03-2012 05:31 PM

Ground wire in boxes
 
I have all EMT conduits and metal boxes.

In many cases I have four 20/20 boxes, two side by side separated by like two inches, to accommodate a light switch, a scone switch, a fan and an outlet (like in a bathroom). Then on the back side of the same wall, I have two more boxes side by side. Basically four boxes very close to each other. They are all connected.

In such as situation, do you connect a separate green wire to each box individually for all the grounding of that box?

Or do you use one green screw and splice out four green wires of varying lengths to take it to each box?

Doesn't matter just wondering the pros and cons.

AllanJ 06-03-2012 07:20 PM

How do the various cables enter the various boxes?

The ground wire must accompany the associated hot(s) and neutral in the same cable or conduit. Once inside the box, all ground wires from the various cables are connected together (bonded) and extra short lengths (pigtails) are used to reach the switch, receptacle, etc.and also one pigtail to reach the box itself.

When a clip sold separately for that purposes is squashed between the switch or receptacle mounting strip (yoke) and the box then it is only necessary to pigtail the grounds to the box and not to that switch or receptacle.

miamicuse 06-03-2012 07:26 PM

It is all EMT conduits transporting the wires.

Right now there is no green wire at all in ANY conduits. All the green wires are contained it each individual boxes are connected to the green screw to the metal box. If I have more then one devices then yes a pig tail and splice together.

I am just wondering in cases where I have four boxes back to back, side by side, may be it's easier to run the green wires from one box to the bother boxes through the short EMTs.

Jim Port 06-03-2012 07:37 PM

Your EMT is your ground. You can pigtail the devices to the boxes.

miamicuse 06-03-2012 08:20 PM

That's what I have been doing.

Just was wondering when I have four boxes so close to each other may be it's easier to run three green wires to the other boxes.

I take back my comments on no green wire in any conduit. I have no green wires in any of the EMT conduits, but where I connect to MC cables I there is green wires in them and I believe one cannot use the MC metal shield as ground.


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