Dealing with a small manufacturing facility that currently has a 208v service. We are going to install a new 480v service and "re-feed" the exsiting 208v service from there.
There will be a new 500kVA 480 - 208v xfmr and 1600a switch located outdoors at the "old" 13.2kv -208 volt utility transformer location.
I am hoping to reuse the conductors between the old utlity transformer location and old 208v switch gear. My problem is, because the 208 conductors use to be the service entrance there is obviously no ground conductor. With my new set up, I will need a ground installed in these conduits. I am hoping to not pull out 150' X 4 conduits worth of 600 CU just to pull a ground in. Is there by any chance an exception that may apply here? I know that the NEC requires that that gnd to be routed with the conductors, but I am hoping I am overlooking something.
Thanks in advance.
There will be a new 500kVA 480 - 208v xfmr and 1600a switch located outdoors at the "old" 13.2kv -208 volt utility transformer location.
I am hoping to reuse the conductors between the old utlity transformer location and old 208v switch gear. My problem is, because the 208 conductors use to be the service entrance there is obviously no ground conductor. With my new set up, I will need a ground installed in these conduits. I am hoping to not pull out 150' X 4 conduits worth of 600 CU just to pull a ground in. Is there by any chance an exception that may apply here? I know that the NEC requires that that gnd to be routed with the conductors, but I am hoping I am overlooking something.
Thanks in advance.