New Sub Panel

[tryinghard]

You seem to be stuck, the OPs situation had no parallel paths, no multiple connections from neutral to earth therefore no 'objectionable current' for 250.6 to address.

The OP's sub panels white, green, & bare wires are terminated together the same as if a service disconnect, not an assumption, - this causes objectionable current issues hence 250.6 (parallel paths). That is why 250.142(B) & 250.24(A)(5) exist. I'm more stuck on the reasons of applying 250.142(B) & 250.24(A)(5)! If these two codes are violated parallel paths will occur (Objectionable Current).

 

[jxofaltrds]

The OP's sub panels white, green, & bare wires are terminated together the same as if a service disconnect, not an assumption, - this causes objectionable current issues hence 250.6 (parallel paths). That is why 250.142(B) & 250.24(A)(5) exist. I'm more stuck on the reasons of applying 250.142(B) & 250.24(A)(5)! If these two codes are violated parallel paths will occur (Objectionable Current).

Try to think of this like a home with a detached garage.

 

[tryinghard]

Try to think of this like a home with a detached garage.

Okay; and objectionable current (paralleling) will occur because the neutrals and equipment grounds common at the sub panel.

 

[jxofaltrds]

Okay; and objectionable current (paralleling) will occur because the neutrals and equipment grounds common at the sub panel.

Only if there is another path back to the 'disconnect'.

 

[tryinghard]

Only if there is another path back to the 'disconnect'.

True and there will be a path and usually more than one (uncontrolled paths) this is exactly why these three codes exist.

 

[jxofaltrds]

True and there will be a path and usually more than one (uncontrolled paths) this is exactly why these three codes exist.

Not busting your chops but what is an "uncontrolled path"?

 

[tryinghard]

Not busting your chops but what is an "uncontrolled path"?

The path current travels other than through the grounded conductor (neutral), in this case the unbalance load. There?s no control for this objectionable current it is not flowing solely on the intended conductor path. Chops are fine [smile]