conductor sizing for gas bond
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tonyi
Senior Member
Re: conductor sizing for gas bond
#14 copper is the minimum for a gas bond.
Basically you size the bond to whatever might be the largest thing that could possibly fault to it. The powered control circuits for any gas appliances are allowed to provide the bond via their gnd wire.
So, if there was a gas furnace, the furnace wiring can provide the gas bond via its gnd wire.
If there's feeders or stove circuits near a gas line I'll up the bond size to whatever the closest stuff near that gas line is. A #10 would cover most ordinary residential situations and is less prone to damage than a #14 or #12, maybe a #8 if there's a subpanel feeder close by.
#14 copper is the minimum for a gas bond.
Basically you size the bond to whatever might be the largest thing that could possibly fault to it. The powered control circuits for any gas appliances are allowed to provide the bond via their gnd wire.
So, if there was a gas furnace, the furnace wiring can provide the gas bond via its gnd wire.
If there's feeders or stove circuits near a gas line I'll up the bond size to whatever the closest stuff near that gas line is. A #10 would cover most ordinary residential situations and is less prone to damage than a #14 or #12, maybe a #8 if there's a subpanel feeder close by.
Re: conductor sizing for gas bond
250.104(B) tells us to size using 250.122, and to bond where it may be energized. Presumedly, the only way for a gas pipe to become energized, would be via the branch circuit that supplies the utilization equipment connected to the gas pipe. If no utilization equipment using electricity is connected, then no bonding is needed. The FPN adds that bonding everything would be nice, but is not necessary.
250.104(B) tells us to size using 250.122, and to bond where it may be energized. Presumedly, the only way for a gas pipe to become energized, would be via the branch circuit that supplies the utilization equipment connected to the gas pipe. If no utilization equipment using electricity is connected, then no bonding is needed. The FPN adds that bonding everything would be nice, but is not necessary.
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