JWK480
Member
- Location
- West Coast, Florida
Hello everyone. I was hopeing I could get a discussion settled I've been having with a coworker.
I'll try to keep only the essentials in my story. We just ran a 500kcmil 3 conductor cable (so 3-500's) and inside that cable are 3 grounding conductors (I don't know their sze off the top of my head) and it's wrapped in a copper shield before being wrapped in the typical insulation. This cable goes between a 250hp motor and an MCC. At the MCC, which has 3 terminals for the unfrounded conductors (brn, org, yel) and one for the grounding conductor.
My question is this, since these three grounding conductors are common to each other, can all three wires go under the same single-barrel lug (which clearly is rated to hold the total kcmil of the sum of their kcmils), or di I need to put one under it and put the pther two under a double barrel lug grounded to the panel?
If anyone is able to finda reference that explains their answer, it would be appreciated so I can make the point to my coworkers.
Thank you!
I'll try to keep only the essentials in my story. We just ran a 500kcmil 3 conductor cable (so 3-500's) and inside that cable are 3 grounding conductors (I don't know their sze off the top of my head) and it's wrapped in a copper shield before being wrapped in the typical insulation. This cable goes between a 250hp motor and an MCC. At the MCC, which has 3 terminals for the unfrounded conductors (brn, org, yel) and one for the grounding conductor.
My question is this, since these three grounding conductors are common to each other, can all three wires go under the same single-barrel lug (which clearly is rated to hold the total kcmil of the sum of their kcmils), or di I need to put one under it and put the pther two under a double barrel lug grounded to the panel?
If anyone is able to finda reference that explains their answer, it would be appreciated so I can make the point to my coworkers.
Thank you!