Question on grounding a new transformer/switchgear

[nhee2]

Was the final conclusion on this OP -
- Install SBJ at transformer and at Switchgear, per 250.30(A)(1) exception 2?
- Per 250.30(A)(2) exception, no SSBJ required between transformer and switchgear
- Therefore feeders from transformer to disconnect would be 4 wire, with no SSBJ or EGC?

And if 2011 code cycle applies, then 250.30(A)(2) exception is not available - then install SBJ at transformer Or switchgear, and feeders are 4/W with SSBJ sized per 250.102(C) (in this case 1/0 CU)?

Sorry, I got lost / confused through some of the sequential posts and wanted to make sure I understood correctly.

If 2014 applies, then there is reduced cost (less copper) to apply the 250.30(A)(2) exception. Are there other benefits?

 

[Smart $]

Was the final conclusion on this OP -
- Install SBJ at transformer and at Switchgear, per 250.30(A)(1) exception 2?
- Per 250.30(A)(2) exception, no SSBJ required between transformer and switchgear
- Therefore feeders from transformer to disconnect would be 4 wire, with no SSBJ or EGC?

And if 2011 code cycle applies, then 250.30(A)(2) exception is not available - then install SBJ at transformer Or switchgear, and feeders are 4/W with SSBJ sized per 250.102(C) (in this case 1/0 CU)?

Sorry, I got lost / confused through some of the sequential posts and wanted to make sure I understood correctly.

If 2014 applies, then there is reduced cost (less copper) to apply the 250.30(A)(2) exception. Are there other benefits?

Seems you have the gist of it all. Don't know of any benefits other than what you have already pointed out.

 

[cbark]

Was the final conclusion on this OP -
- Install SBJ at transformer and at Switchgear, per 250.30(A)(1) exception 2?
- Per 250.30(A)(2) exception, no SSBJ required between transformer and switchgear
- Therefore feeders from transformer to disconnect would be 4 wire, with no SSBJ or EGC?

And if 2011 code cycle applies, then 250.30(A)(2) exception is not available - then install SBJ at transformer Or switchgear, and feeders are 4/W with SSBJ sized per 250.102(C) (in this case 1/0 CU)?

Sorry, I got lost / confused through some of the sequential posts and wanted to make sure I understood correctly.

If 2014 applies, then there is reduced cost (less copper) to apply the 250.30(A)(2) exception. Are there other benefits?

Yes, I think this provides the best/easiest solution.

As a follow up question: If this installation is followed, then the X0 bushing at the transformer will only have the neutral wires connected (no connection to ground inside the transformer compartment); correct?

 

[augie47]

If you are using the exception that allows you to omit the jumper (note that you can only do so if there is don't introduce a parallel path such as metallic conduit), them you will have a system bonding jumper at both the transformer (XO to case & Gr Electrode) and the 1st disconnecting means.