Grounding of two wire circuits

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Castrovinci

Castrovinci

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NJ
I have been searching the NEC for this and can't seem to find it. I will be replacing a ceiling fan for a customer that has only "two wire BX" circuits no ground. My question is do I take the ceiling fan ground and tie it in with the neutral or do I just leave it off. I was thinking a GFCI breaker but I have heard too much trouble with tripping issues. I don't do too much residential.

Does anyone have an article number as well?
 
I see you are an engineer but are you licensed to electrical work?

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Don't take this wrong but as an PE and licensed electrician you should be able to forget the NEC and think of the theory and reasons for EGC's and then apply that to what you would be doing.

GFCI's work fine in commercial kitchens and construction sites so this fan should not be a problem.

Roger
 
If I were to bet, in reality I bet a vast majority of such fans get re-connected with the ground left unconnected.
From my experience, fans vs GFCI are not near the problem they are thought to be.
IMHO, the worst thing you could do would be to connect the grounding to the grounded.
 
just pull a new cable

just pull a new cable

You could use 250.134(B)ex1 But I find it easier to just pull a new cable back to the panel. As Holmes says "make it right"

I always grumble when a simple job turns not so simple but I sleep well at night knowing its done right.
 
Is the sheath of the BX cable an equipment grounding conductor? If newer cable it likely is they put a bare bonding conductor just under the sheath to make it a more effective equipment grounding conductor.

If older cable it may not not be a EGC and may not even be grounded at all.

If it is grounded in any way by connecting the green wire on the fan to the neutral in the outlet box you have just made the sheath a parallel path for neutral current.
 
roger said:
Don't take this wrong but as an PE and licensed electrician you should be able to forget the NEC and think of the theory and reasons for EGC's and then apply that to what you would be doing.
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He should, but many never do. Think about how many times we get questions along these lines from people who would know better if they just spent a little time thinking about it. But, like many things, we tend to not think about them until we have to.
 
augie47 said:
If I were to bet, in reality I bet a vast majority of such fans get re-connected with the ground left unconnected.
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I'll piggyback that for double the money.
augie47 said:
IMHO, the worst thing you could do would be to connect the grounding to the grounded.
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That bears repeating. Don't do it.

Think about it. Read through the discussions here. Maybe someone could post a few good threads for the OP to read.
 
Re:

Re:

All,
Thanks for your replies. A great wealth of collective thoughts you have provided.

I do think the best answer is running a new cable, since I will be running another homerun near there anyways. But if I run into this issue in the rest of the house I may have to go with a gfci as unfortunately its the old style BX with no ground at all besides the tracer (from my understanding can never be used as a ground). I don't believe it will be such an issue even with a motor load such as a fan but I still do hear of 1 or 2 problems from different folks. Although mostly older GFCI's seem to be the root even the new style GFCI's (depending on manufacture) you still here a few issues.

The parallel grounded and grounding conductor scenario makes a great deal of sense although if I understand correctly it can be done to an existing branch circuit for range/dryer recp. 250.140 (my wire is certainly less than 10 though and it not a range!) Nevertheless the 2008 NEC handbook explains better on the parallel potential grounding/grounded situation on page 253

Unfortunately looking over article 250.134 (B) Ex 1 wouldn't really do me any great help since I would still need to run a separate conductor, and at that point I might as well run a separate line.

I guess my final though is since it's just replacing a ceiling fan would one have the right to put the fan back up there with no ground connected since I have not changed any electrical installation or does it fall under the same principle that we have all seen a thousand times ---- ceiling fan hanging with no listed ceiling fan box? I understand it?s not good practice, but is it a violation I am just curious.

New Line or GFCI!

Thanks everyone
 
Added comment

Added comment

roger said:
Don't take this wrong but as an PE and licensed electrician you should be able to forget the NEC and think of the theory and reasons for EGC's and then apply that to what you would be doing.

GFCI's work fine in commercial kitchens and construction sites so this fan should not be a problem.

Roger

He should, but many never do. Think about how many times we get questions along these lines from people who would know better if they just spent a little time thinking about it. But, like many things, we tend to not think about them until we have to.
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The parallel grounded and grounding conductor scenario makes a great deal of sense although if I understand correctly it can be done to an existing branch circuit for range/dryer recp. 250.140 (my wire is certainly less than 10 though and it not a range!) so its not that I am not thinking about this its just I NEVER deal with BX-..MC or pipe only.....Nevertheless the 2008 NEC handbook explains better on the parallel potential grounding/grounded situation on page 253

Heck we can't know it all....common sense or not... :roll:
 
Castrovinci said:
I guess my final though is since it's just replacing a ceiling fan would one have the right to put the fan back up there with no ground connected since I have not changed any electrical installation or does it fall under the same principle that we have all seen a thousand times ---- ceiling fan hanging with no listed ceiling fan box? I understand it?s not good practice, but is it a violation I am just curious.
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Violation. See 410.42 (B)
 
Dennis Alwon said:
I would connect the ground from the fan to the metal box and be done with it. It can't be any worse then it was.
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Why go through that effort and time? Why not just walk up and down the ladder a few extra times instead? At least you would be getting some exercise.
 
Answer

Answer

mivey said:
Violation. See 410.42 (B)
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Thank you this is exactly what I was looking for.:grin: It sums up my whole question

In Summary it must have one of the following

1. GFCI Protection
2. Seperate Ground ran in accordance to 250.130(C)
3. Be made of Insulated material and have no exposed parts
4. Be inaccessible to unqualified personnel
 
Castrovinci said:
Thank you this is exactly what I was looking for.:grin: It sums up my whole question

In Summary it must have one of the following

1. GFCI Protection
2. Seperate Ground ran in accordance to 250.130(C)
3. Be made of Insulated material and have no exposed parts
4. Be inaccessible to unqualified personnel
Click to expand...
I don't think exception #4 applies to wiring methods with no ready means for grounding.
 
Castrovinci said:
The parallel grounded and grounding conductor scenario makes a great deal of sense although if I understand correctly it can be done to an existing branch circuit for range/dryer recp. 250.140 (my wire is certainly less than 10 though and it not a range!) so its not that I am not thinking about this its just I NEVER deal with BX-..MC or pipe only.....Nevertheless the 2008 NEC handbook explains better on the parallel potential grounding/grounded situation on page 253

Heck we can't know it all....common sense or not... :roll:
Click to expand...

The use of grounded circuit conductor as equipment grounding also on a range or dryer is not a parallel path it is only one path connected to the load as well as the frame of the range or dryer. Now if another grounded object is to contact the range or dryer then it may carry some of the grounded circuit conductor current.

BX (AC) cable is required for the sheath to have adequate fault carrying capabilities. (320.108)

MC cable sheath can, but does not have to be an equipment ground conductor. (330.108)

Old AC cable does not have bonding conductor installed like newer AC which helps assure a lower impedance during a fault, but is still grounding potential if connected to grounded enclosures with proper fittings.
 
mivey said:
Why go through that effort and time? Why not just walk up and down the ladder a few extra times instead? At least you would be getting some exercise.
Click to expand...

The op's customer has BX. I am betting it is grounded, at least somewhat.
 
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