Originally Posted By: rmoore
This post was automatically imported from our archived forum.
“There was no ground wire run within the conduit.”
As Dave said, metallic conduit can serve as the equipment grounding condutor as long as continuity is maintained. You'll also see this in taller condos where all wiring is run in conduit.
"Moreover, the copper piping connections are dielectric, so there is no metal to metal ground connection to the house plumbing. (as it should be)."
??? I'm not sure what you are getting at there. In your photo the hot/cold bonding jumper is properly installed above the flex hoses, so that the bond remains even if the water heater and flex is removed.
"Will a connection from the ground lug on the water heater to the grounded house plumbing be sufficient?"
No! Assuming you didn't have the conduit or a regular grounding wire, you cannot use the water piping as an EGC. Equipment grounding conductors are used in the case of a ground fault to reliably pass current to the utility's grounded conductor by means of the bond at the service equipment, and thereby trip the OCPD. Too many uncertanties in the water piping to rely on it for that purpose (even if it would work in most instances). EGCs have to be run with
the current carrying conductors.
In other words, the water (gas, etc) piping is bonded to prevent shock if it is accidently energized, not to act as any equipment ground.
I think that is right. ![eusa_think.gif](upload://lNFeGuTetUAtwNVgUSOuUzgrGGK.gif)
Anyway...the set-up in your photo (and the way you describe it) looks good to go. That fabric or wallpaper in the photo could kill you though. That's some ugly crap!
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