Sprinkler Main Bonding

[Dan Mulligan]

I doubt many would agree.If you are addressing it as a grounding electrode then 3/0 is the largest required (250.66) and if you are bonding it then under '23, 3/0 again is the largest required.

But does it need to be bonded based on the service size or the largest circuit most likely to energize the piping system 250.104 B 1 and in this case the only circuit in the vicinity would be 20 amp.

 

[augie47]

But does it need to be bonded based on the service size or the largest circuit most likely to energize the piping system 250.104 B 1 and in this case the only circuit in the vicinity would be 20 amp.

It's metal water piping so I would think 250.104(A),,,, service size.