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The inspector is saying to use a 1/0 between the xo and case, I don't see anything like that in the code. 600v to 208v delta wye
 

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If you create a noodle, you've an SDS, if you've an SDS you've an MBJ & GEC's Aegis.....

~CS~
 

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Grounding vs Bonding.

Yes, 10-812 says that for your grounding conductor #6 is enough.
But, from the can to the X0 isn't grounding, it's bonding. 10-814 & Table 16 come into play.

But still, I have no idea where the inspector is getting 1/0 from, unless you're largest conductor is rated for 800A. (Must be a huge voltage drop:eek: )
 

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the NEC art 250.28(D)(1) for system bonding jumper (XO to TF enclosure), and is sized the same as the main bonding jumper.

250.28(D)(1) sends you to table 250.66

yes, I realize he is from Canada, just thought I'd ref. the NEC
 

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The inspector is saying to use a 1/0 between the xo and case, I don't see anything like that in the code. 600v to 208v delta wye
In the event of a short circuit at the transformer would you not want to carry the maximum current that the transformer could push?
 

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Aegis said:
The inspector is saying to use a 1/0 between the xo and case, I don't see anything like that in the code. 600v to 208v delta wye
I'm currently working on a 225kva and I ran a 2/0 bond
 

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Table 16 says #6 is fine to me but I still say if a factory bonding strap is installed that's all you need

10-614
(2) Straps, when used for bonding non-current-carrying metal parts, shall be not less than 19 mm in width and
not less than 1.4 mm in thickness if of steel or not less than 1.2 mm in thickness if of aluminum or copper.
 
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