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.

 

[Dan Mulligan]

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

If it were gas piping would you run a 3/0 to it? Typical the gas pipe is bonded thru the appliance. Isn't the sprinkler pipe the same as gas pipe in regards to bonding?

 

[don_resqcapt19]

If it were gas piping would you run a 3/0 to it? Typical the gas pipe is bonded thru the appliance. Isn't the sprinkler pipe the same as gas pipe in regards to bonding?

Gas piping has its own rule in 250/104(B), and its bonding is based on the rating of the circuit that is likely to be energized.
Not sure why the rules for water piping and other piping are different as the hazards are identical.

 

[augie47]

Certainly not saying it is or is not logical simply noting the rules for bonding a metal water piping system are different from those bonding other piping systems.