Originally Posted by
Jon Randolph
Unless this is grounded via the water pipes and they are shared between the buildings, it should be grounded, IMO.
Originally Posted by
Jon Randolph
Yeah, that is what I meant. I specified water piping, but I should have said any matallic path.
Jon,
Nope, not then either.
The underground water pipe is not allowed to be used for that use. It may be 'used as' one of the grounding electrodes if it meets the requirements (at least 20 feet long underground), but is does not meet the requirements for 'grounding electrode conductors' or bonding jumpers between grounding electrodes.
Thus, is there is a metal water pipe, you would still install all the present grounding electrodes at the second structure, and you would still be required to run a separate grounding conductor (4 wires) to that building.