Does this metal water piping system require bonding per 250.104?
Notice the rubber vibration sections between incoming and outgoing sections through the motors. Is a bonding jumper required here?
Here is an explanation from an engineer on why this does not need to be bonded:
My thoughts are as follows :
1) I believe the intention of 250.104 (A) is to provide for the bonding of the cold and/or hot water piping systems within a building. I believe the commentary text contained in the 2008 handbook (following 250.104 (A) (1)) confirms this.
As I mentioned previously, the inspector raised several bonding issues. I think it is important to point out that I agreed with a portion of the inspector’s concerns and with that in mind, the contractor was asked to go back and bond portions of the domestic water piping system in order to satisfy 250.104.
2) I believe that the distribution piping in question would fall under 250.104 (B) – Other Metal Piping. With this being said (and again, I find the commentary text very helpful here) the other metal piping would not become energized because we have an electrical installation (disconnect, conduit, motor, etc) which is grounded and bonded (per NEC) to prevent the distribution piping from becoming accidentally energized
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