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Jul 15 '20 at 17:42 comment added Nate S. Also, the new construction you've seen that passed inspection with less probably had a "ufer" ground, aka a concrete encased electrode in the form of a connection to the foundation rebar, and that actually provides a better ground connection than traditional ground rods.
Jul 15 '20 at 17:39 comment added Nate S. @mreff555, yes, the gas line must be bonded too -- I believe that's about avoiding static electricity sparks near gas. And your furnace does indeed count as a gas appliance. Note though, if your furnace has an electrical connection for its electronics, that may include a ground wire that also bonds to the gas pipes, in which case you would be all set.
Jul 15 '20 at 1:37 history became hot network question
Jul 14 '20 at 22:56 comment added mreff555 What about the gas line? He said it had to be both. I don’t even have gas appliances. Just the furnace.
Jul 14 '20 at 19:12 history edited isherwood CC BY-SA 4.0
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Jul 14 '20 at 18:51 comment added Ed Beal Per my answer you may still be above 25 ohms but as long as you have 2 electrodes that is all code requires 1 can be a water pipe 250.53.5.D but a supplemental is required 250.53.2 for the code references not in my answer. But all the conductive plumbing even duct work is required to be bonded.
Jul 14 '20 at 18:49 comment added Harper - Reinstate Monica Yeah, it turns out dirt is a rather poor conductor of electricity. That does explain why they go to all the trouble to mine copper, instead just wrapping insulation around dirt.
Jul 14 '20 at 18:18 answer Ed Beal timeline score: 5
Jul 14 '20 at 18:11 answer Nate S. timeline score: 4
Jul 14 '20 at 17:36 history asked mreff555 CC BY-SA 4.0