SUSE Rated Panel grounding

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Maven85

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Tempe, AZ
Good afternoon Everybody,

If you have a 277/480V, 3P, 4W, 200Amp MCB SUSE rated panel mounted on a unistrut would you need to bond to building steel and cold water pipe to complete grounding system if the building steel and cold water pipe are 100' away minimum? Wouldn't this be considered not "available"...

I was going to provide a #4 ufer or (2) 3/4" x 10'-0" ground rods minimum of 6' apart (& not bond the neutral and ground bus as this has been done upstream at it's source).

appreciate your input
 
infinity said:
So it's mounted on a structure completely separate from the building?
Click to expand...

Yes (if you consider a unistrut on a concrete pad a strucutre)

it's not mounted on the existing building that has the existing SES at all (100' away give or take) and why I was calling it out as service rated equipment with main breaker and providing the appropriate panel grounding.

Thanks
 
I was waiting on Rob's answer but hopefully he won't mind my opinion.
Looking at the NEC definition of a "Structure", I think most would consider your remote panel to be a structure.
As such, 250.32 would be applicable and there would be no requirement to bond back to the "supply" structure (your equipment ground would provide almost the same thing).
Your grounding electrode system at the panel would need to comply with 250.32(A).
 
augie47 said:
I was waiting on Rob's answer but hopefully he won't mind my opinion.
Looking at the NEC definition of a "Structure", I think most would consider your remote panel to be a structure.
As such, 250.32 would be applicable and there would be no requirement to bond back to the "supply" structure (your equipment ground would provide almost the same thing).
Your grounding electrode system at the panel would need to comply with 250.32(A).
Click to expand...

Yea i'm providing the equipment ground conductor with the supply conductors to remote panel from existing service.

per 250.32(A) since there is no existing grounding electrode one shall be installed as required in 250.50.

per 250.50 since no grounding electrodes as described in 250.52 (A)(1) through (A)(7) are present one or more shall be installed as specified in 250.52(A)(4) through (A)(8).

I think grounds rods is they way i'm going (unless you think providing #4 UFER is preferred choice ...or maybe both)

Thanks!
 
You have two separate structures, so each will require a GES. For the service on the unistrut it could simply be 2 ground rods.
 
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