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Thread: bonding

  1. #1
    Join Date
    Dec 2017
    Location
    Oxford CT
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    4

    bonding

    The main water feed from the street to the basement is in PVC. The entire water system in the condo is all copper. Should there be a bond attached to the water system to the electrical ground ? Should the hot and cold copper water pipes at the gas fired water heater be bonded together ? , Also should the incoming gas black iron pipe be bonded to the copper water and or to the electrical ground? The electrical service (100 amp) with the ground on a couple of rods outside.

    Thanks for your input
    Petro

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
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    33,314
    Quote Originally Posted by petro View Post
    The main water feed from the street to the basement is in PVC. The entire water system in the condo is all copper. Should there be a bond attached to the water system to the electrical ground ?
    Yes the water piping system needs to be bonded

    Should the hot and cold copper water pipes at the gas fired water heater be bonded together ?
    Some inforcement officials require the cold and hot to be bonded with a bonding jumper. Some systems the hot and cold are bonded thru the water heater itself so the jumper is not necessary, IMO

    Also should the incoming gas black iron pipe be bonded to the copper water and or to the electrical ground? The electrical service (100 amp) with the ground on a couple of rods outside.
    The black iron may not need any extra bonding. For instance, if there is a gas range then the black iron is bonded thru the equipment grounding conductor of the circuit that feeds the furnace. This is allow per 250.104(B)
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  3. #3
    Join Date
    Dec 2017
    Location
    Oxford CT
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    4

    bonding

    Dennis, Thanks for the reply, for sure I believe you are correct on the bonding of the cold water water system to the electrical panel. but sometimes I like to go above and beyond, so in addition to that, I'm thinking of putting a bonding jumper from the hot and cold just above the gas fired water heater.
    The only one I'm not totally clear on is the black iron gas pipe. I do understand that the ground wire from the gas appliance automatically grounds the gas pipe, but if the gas stove is removed won't that cause the gas pipe not to be bonded, or am I looking to deep.

  4. #4
    Join Date
    Feb 2003
    Location
    Minnesota
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    6,802
    One can certainly bond the Grounding Electrode System to a complete metallic fuel gas piping system. But there may be requirements outside the NEC if portions of the gas piping are Corrugated Stainless Steel Tubing, CSST, which has rules established by the actual manufacturer of the CSST.
    Another Al in Minnesota

  5. #5
    Join Date
    Dec 2017
    Location
    Oxford CT
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    I have read many articles on the danger of CSST. The lightning strikes seem to be the biggest threat. One of the manufactures of the CSST are requiring the brass fitting on the tubing be bonded, but other articles say that's not the total answer. So I had all 4 sections of the CSST replaced with black iron pipe.
    I realize I would have a better chance at wining the power ball than having a lightning strike and having that electrical charge find it's way to ground through the CSST, but I do sleep better at night.

  6. #6
    Join Date
    Jul 2005
    Location
    Tennessee
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    Probably a little over concern on you part but since you have one location, the water heater, with all three pipes available, there is no harm in bonding them together if you want to take that step.
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  7. #7
    Join Date
    Dec 2017
    Location
    Oxford CT
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    4

    bonding

    Quote Originally Posted by augie47 View Post
    Probably a little over concern on you part but since you have one location, the water heater, with all three pipes available, there is no harm in bonding them together if you want to take that step.
    Good advise, sometimes I'm just looking for things to do.

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