This is an ungrounded Delta. The source (Distribution Panel) is approx. 200' away. From that, they ran 3 - 4/0's ungrounded conductors, 480v and no equipment ground in a tray that is bonded to Bldg. steel.
These were ran to a small Bldg. that will be removed. They want to splice the conductors in the cable tray and continue them to another small Bldg. In the Bldg. there will be a trough and 2 disconnects that will be mounted.
This would be considered a feeder to the Bldg. and not a service. There is a grounding electrode at the Bldg. steel.
Would it be to code, if I were to run a #4 from the new disconnects to the Bldg. steel, to create an equipment ground? Or must I run a #4 back into the tray and back to the source with the feeders, (200'away)which they should have done from the get-go.
SJT
