sds bonding neutral to egc?

[steveng]

is main service disconnect , the same as the first disconnect?

the reason for this question is, there is a sds feeding 2 panels,
panel 1 is within sight of the xfmr 75kva 480/208/120 wye 3 ph
panel 2 is 120' away, the first disconnect for panel 2 is fused within sight of the xfmr , the egc and neutral pass thru onto the main panel which is 120' away which is a 100amp 3 ph panel with main.

so the bonding bar, strap or wire or screw would be used here, correct?

if so wouldn't there be a parallel path back the 120' to the xfmr?

 

[al hildenbrand]

Steven,

Take a look at 250.30(A)(1).

You can put the bonding jumper only in a single place.

There is an exception, 250.30(A)(1) Ex. No. 2, that says you can have two bonding jumpers, but there can't be a parallel path.

 

[infinity]

I'm sure I really understand your setup.

1) You have two panels both fed from a single transformer?
2) Panel 2 has a disconnect switch?
3) Panel 1 has no disconnect switch?
4) Where is the XO bonded?

 

[tryinghard]

is main service disconnect , the same as the first disconnect?

Yes but the first disconnect is not necessarily a service disconnect because the service disconnect is one that can open all phase conductors of the utility service. Your case sounds like a SDS not service and your disconnect is not service (utility) rather it is simply "disconnecting means", 250-30 applies.

the reason for this question is, there is a sds feeding 2 panels,
panel 1 is within sight of the xfmr 75kva 480/208/120 wye 3 ph
panel 2 is 120' away, the first disconnect for panel 2 is fused within sight of the xfmr , the egc and neutral pass thru onto the main panel which is 120' away which is a 100amp 3 ph panel with main.

so the bonding bar, strap or wire or screw would be used here, correct?

if so wouldn't there be a parallel path back the 120' to the xfmr?

You need to bond the grounded (neutral) conductor at either the transformer (XO most common) or the first disconnect - panel #1 in your case. Also in your case you cannot bond the neutral anywhere else 250-24(A)(5) & 250-142(B)

 

[steveng]

thanks tryinghard

thanks tryinghard

Yes but the first disconnect is not necessarily a service disconnect because the service disconnect is one that can open all phase conductors of the utility service. Your case sounds like a SDS not service and your disconnect is not service (utility) rather it is simply "disconnecting means", 250-30 applies.



You need to bond the grounded (neutral) conductor at either the transformer (XO most common) or the first disconnect - panel #1 in your case. Also in your case you cannot bond the neutral anywhere else 250-24(A)(5) & 250-142(B)

i believe you best answered my question,

thanks to all, who replied, you are the reason this forum is what it is!