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PPE Saves Fingers
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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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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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