Neutral bring to disconnect

[wwhitney]

Take a look at NEC 2017 Article 250.28(D)(3). That would allow sbj in swbd and in fire pump controller/ats and no sbj in swbd. If outdoor was not allowed then it should say something. Correct or incorrect?

I assume that is a typo, and "no SBJ in SWBD" should be "no SBJ in transformer (source)".

Just because 250.28(D)(3) presents two options doesn't mean that some other section can't limit you further in some situations. And 250.30(A)(1) plus 250.30(C) say that "If the source is located outside the building or structure supplied, a system bonding jumper shall be installed" at the source.

So of the two options 250.28(D)(3) presents, 250.30(A)(1) plus 250.30(C) removes one of the options when "the source is located outside the building or structure supplied." That means you can only use the "the system bonding jumper for each enclosure" option of 250.28(D)(3) when the source is in the building supplied.

Cheers, Wayne

 

[wwhitney]

A outdoor 13.8 kV system is basically a utility system if it were utility owned they would connect the secondary neutral to a GES at the transformer vault.

While bonding and earthing are related, the OP's questions are related to bonding and the location of bonding jumpers, and not directly to earthing and the location and connection to GESs.

Cheers, Wayne