3 phase 4 wire system for multible building

[transman2]

If you have multible buildings with sub-panels at each, but an equipment grounding conductor was not run with the feeder, can you use a continous water piping system that feeds multible buildings as the grounding conductor if you bond from the water pipe at each building to the building sub-panel grounding terminal bar and by this means, keep the grounded and grounding seperate with the exception of the source or first means being bonded together.

 

[Smart $]

Grounding conductor not required for buildings installed under pre-2008 code cycle. Under 2008 NEC, an EGC must be routed with the circuit conductors... and no way around it.

 

[augie47]

If I remember correctly, prior to '08, if there was a metallic path between the buildings, such as your water line, an equipment ground was required, so, in your situation, an EGC is required.