The lighting circuits in question will indeed be multi-wire branch circuits. Specifically, there will be 3 circuits from each of the two panels, so 3 phase wires plus one neutral and one ground conductor (something we generally require regardless of type of conduit used) for each panel. 10 wires in all, 6 ckts, 2 neutrals, 2 grounds, all in one common conduit.
The separate electrical systems will each be bonded at the source according to code. I see no indication that there is any intent to bond the two systems together, other than the obvoius path of the common conduit run.
One last question: What is the probability of there being a significant difference in ground potential between the two service points which are about a mile apart? We are dealing with different service points with a good deal of separation, but the same utility, and maybe or maybe not fed from the same utility substation.
If there were a difference of ground potential, then connecting the two points via a conduit path would result on a chronic small current flow through the conduit (at least until one end ran out of electrons
![[Linked Image]](https://www.electrical-contractor.net/ubb/cool.gif)
).
Radar
