Everything in my house is tied to the single point service entrance as it
enters the house.
The ground rod is actually inside the house sticking out of the basement
slab directly under the breaker boxes. Cable (after some nagging),
telephone, ham antenna feed and of course the grounds for the two fuse boxes
all tie there.
It occurred to me that I had never seen such a tie for my propane service
however. I just checked outside and the tank, which is 50ft away from the
service entrance, has no connection to this single point ground.
The 1000 gallon tank is buried and the service line comes up at the back
corner of the house, enters a regulator which is mounted on the entrance
pipe which penetrates the foundation. From there it travels across the
basement to the furnace. Ground rise potential differences between the tank
and the service point ground must therefore transit the basement first on
the metallic flexible gas line, then via the furnace electrical circuit back
to the box.
I think the National Electrical Code covers all the issues related to
grounding. Does it say anything about the grounding of the propane service?
tnx
jim ab3cv
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