EMT as Equipment Grounding Conductor

Status
Not open for further replies.
dmanda24

dmanda24

Senior Member
I am planning on using 3/4" emt conduit as the equipment grounding conductor for a 60 amp 3 phase CU circuit, What are the main things to be careful about when doing this.
questions
1) do I need to use grounding bushings? When are grounding bushings required?
2) when I get to the disconnect, just use a ground lug to come out of the disconnect into the CU
3)is there a limit to the size of the branch circuit where you can use emt as the equipment grounding conductor?

Thanks, code references would be greatly appreciated it.
 
Unless there are engineer specs the emt will be fine. No bonding of the pipe is necessary. The arguments that go against the use of emt as a ground are human error in making up fittings tightly. The pro is that emt is probably a better ground then the #10 that would be required for a 60 amp cir. Some feel better with the extra protection of a wired egc.
 
dmanda24 said:
What are the main things to be careful about when doing this.
Click to expand...

Make sure the joints tight.

1) do I need to use grounding bushings? When are grounding bushings required?
Click to expand...

If it's more then 250 volts to ground and you are entering a concentric KO not listed for grounding.

250.97

Or if it happend to be a service raceway.

250.92


2) when I get to the disconnect, just use a ground lug to come out of the disconnect into the CU
Click to expand...

That will work.

3)is there a limit to the size of the branch circuit where you can use emt as the equipment grounding conductor?
Click to expand...

Not really.

250.118
 
Dennis Alwon said:
Didn't know that-- ;)
Click to expand...

It is becoming less of an issue as many boxes now have eccentric KOs that are listed for grounding.

Notable exceptions are some panel and disconnect enclosures that still use concentric KOs.
 
Chris ask me to send this "I would feel better if you ran an EGC in the conduit and not rely on the fittings that the slack butt electrician never make up tight." :D
 
Dennis Alwon said:
Chris ask me to send this "I would feel better if you ran an EGC in the conduit and not rely on the fittings that the slack butt electrician never make up tight." :D
Click to expand...
LOL:grin:

I still run an EGC in EMT for feeders, but have quit running them with branch circuits. Times are tight.

I'm getting laryngitis from constantly asking the slackers:

'Are the set screws tight, are the lock nuts tight?'
 
I feel better about this but, I know Grounding & Bonding is my weakest subject.

I researched all this and did manage to come up with every article except 250.118 ... :smile: & I know this, I just didn't think of it, 2 out 3, shoot thats failing or a no credit "D" ....

Frankly I was going to post, then I thought better, frankly I found more reasons to have an EGC,
my thoughts got crossed and just scratched it.:D
 
Status
Not open for further replies.
Top