I would like to know if it is actual code or if only certain areas require grounding plumbing and gas lines within the house.
And if so , why?
My cousin is building a house where there are no inspectors nor permits required.
His water and gas line feeds are plastic/PVC. Once they inter the house the water line is copper and (not sure about gas line). Is he required to bond to these metallic lines? It seems kinda dangerous to me, being that if the main neutral ever gave up. It's load has to go somewhere doesn't it? What if your taking a shower and it decides to use you as its path? Singing in the shower is one thing, but dancing is not preferred. Comments please.
The copper waterline would still have to be bonded. (and 2 Gr rods - check local requirements) You have to think of it as putting all your metal stuff at the same potential which means that there would be no voltage there. If a live wire touched a pipe and it was not bonded it could remain live and breaker would not trip that would be bad for you standing outside in a puddle touching the water spigot.
The gas line may have different requirements, you better check on that. Maybe someone else can add more info here?
Normal fare here is Connect to underground (metallic) waterpipe and 1 Ground Rod. If waterpipe cannot be used because it it plastic outside then 2 rods 6 feet apart and a bond to the interior metal waterpipe.
Bill, The gas line bonding is part of an overall bonding philosophy as you described above. The FPN even suggests bonding ductwork. I actually called PECO one day to inquire about this and was told that they actually look for it to be done. Also, article 250-52(a) prohibits metal underground gas lines from being used as the grounding electrode. My brain is too tired to imagine the difference, as far as ramifications, between bonding to it and using it as an electrode. Maybe because complete isolation can't be assured, bonding is in order to minimize potential.
>My brain is too tired to imagine the difference Simply put, it is bonded, but it cannot be counted as a required electrode.
I feel the same way about waterlines.
Rationale: May be replaced with plastic or disconnected in the future. The plumber shouldn't have to call an electrician to come install electrodes, and I bet he won't. So in go the dedicated ground rods today.