Grounding and a Mulberry cover

[HackElectric]

So let's say you have a 1900 box attached to a panel with a typical metal offset nipple. The box is now bonded.

You nut & bolt a GFCI to this type of cover and install it on the 1900 box:

Since the corners are flattened, you don't need an EGC running to the GFCI, is that correct?

 

[texie]

So let's say you have a 1900 box attached to a panel with a typical metal offset nipple. The box is now bonded.

You nut & bolt a GFCI to this type of cover and install it on the 1900 box:

Since the corners are flattened, you don't need an EGC running to the GFCI, is that correct?

Yes. That said, I've encountered many who think otherwise.

 

[George Stolz]

Sometimes from one graphic to the next in the same book. Still trying to figure that one out...

 

[SceneryDriver]

So let's say you have a 1900 box attached to a panel with a typical metal offset nipple. The box is now bonded.

You nut & bolt a GFCI to this type of cover and install it on the 1900 box:

Since the corners are flattened, you don't need an EGC running to the GFCI, is that correct?

Required by code or not, I think a grounding jumper is a good idea and I always install one. How many receptacles have you seen that end up loose on the cover? How many times have you seen a loose cover? Maintaining ground continuity is always a good idea.


SceneryDriver

 

[HackElectric]

Required by code or not, I think a grounding jumper is a good idea and I always install one. How many receptacles have you seen that end up loose on the cover? How many times have you seen a loose cover? Maintaining ground continuity is always a good idea.


SceneryDriver

There's always one :lol:

 

[John120/240]

Required by code or not, I think a grounding jumper is a good idea and I always install one. How many receptacles have you seen that end up loose on the cover? How many times have you seen a loose cover? Maintaining ground continuity is always a good idea.


SceneryDriver

There's always one :lol:

Going above & beyond code is not a sin. For the minimal labor & material involved if it gives you a warm fuzzy feeling do it. I am on both sides of this fence.

 

[iwire]

Going above & beyond code is not a sin. For the minimal labor & material involved if it gives you a warm fuzzy feeling do it. I am on both sides of this fence.

Considering the location of it I would be fine without a wire ECG.

 

[HackElectric]

Going above & beyond code is not a sin. For the minimal labor & material involved if it gives you a warm fuzzy feeling do it. I am on both sides of this fence.

You should upsize it to a #8, just to be sure :bye:

This question isn't about warm and fuzzy feelings, it's about code.

 

[kwired]

You should upsize it to a #8, just to be sure :bye:

This question isn't about warm and fuzzy feelings, it's about code.

Which of course the EGC terminal of the receptacle will not accept a #8 and we will have to jerry rig something to make it work leading to more questionable installation methods.

 

[HackElectric]

Which of course the EGC terminal of the receptacle will not accept a #8 and we will have to jerry rig something to make it work leading to more questionable installation methods.

Wirenut it to zipcord?

 

[kwired]

Wirenut it to zipcord?

How did I overlook that solution? Though the wire nut is too expensive, so how about we just strip about 2 inches of the zipcord and wrap it several times around the #8, maybe secure it with a little tape?:huh:

 

[HackElectric]

I think we should just tack weld the receptacle to the cover plate and the cover plate to the box, this way we don't have to worry about all the screws coming loose and ruining our ground continuity.

 

[kwired]

I think we should just tack weld the receptacle to the cover plate and the cover plate to the box, this way we don't have to worry about all the screws coming loose and ruining our ground continuity.

If they are a little loose the first ground fault encountered may weld it for us, just make sure to use FPE breakers to help ensure it doesn't trip too soon

 

[GoldDigger]

...just make sure to use FPE breakers to help ensure it doesn't trip too soon

Talk about making lemonade when life gives you lemons!

 

[HackElectric]

So to bring this back to the topic, I don't buy into the whole running of a copper EGC thing. The only reason a mulberry cover is going to come loose is because it was installed wrong, which I (or my employee) isn't going to do. If we were in the habit of installing cover plates incorrectly, then we could also install copper EGC's incorrectly, whether it be at the device screw, at the box screw, or at the wirenut splice.

So barring whether it makes you feel better, is there a definitive answer on whether it is code compliant to not run a copper AGC to the device in the situation described? What George Stolz posted seems to say that it goes both ways.

 

[John120/240]

So barring whether it makes you feel better, is there a definitive answer on whether it is code compliant to not run a copper AGC to the device in the situation described? What George Stolz posted seems to say that it goes both ways.

It is NEC code acceptable to use the metallic conduit as your EGC.
It is NEC code acceptable to go above and beyond NEC code and install a wire type EGC of the appropriate size.
Do whatever floats your boat.

 

[George Stolz]

What George Stolz posted seems to say that it goes both ways.

That was a Delmar/Cengage set that I use for class, and the pair spanned at least a couple editions. I can't make heads or tails of the graphics, to be honest.

I believe Holt's material (and the NEC itself) favor the idea that it is compliant.

 

[HackElectric]

It is NEC code acceptable to go above and beyond NEC code and install a wire type EGC of the appropriate size.
Do whatever floats your boat.

You just can't let it go, can you? :lol:

What you are doing here is the same thing as going into a thread in which someone is asking about running the proper wire size and badgering them that they should run a larger wire than required just because it makes you feel better.

Give it up already.

 

[George Stolz]

Keep it civil.

 

[texie]

That was a Delmar/Cengage set that I use for class, and the pair spanned at least a couple editions. I can't make heads or tails of the graphics, to be honest.

I believe Holt's material (and the NEC itself) favor the idea that it is compliant.

250.146(A) seems pretty clear, no? UL White Book says this is covered by EOYX, QCIT, RTRT, and WJQR.