What was the resistance in Ohms?
Looks like it’s reading zero. Are you sure you have continuity? I get 2.2 across a 6AWG bonding jumper on copper.
The water pipe is only grounded at the street side of the water meter. This is only the cold water pipe. The hot water pipes need to be grounded and the best place for this is where they both are close together and easily reached. That’s why we use this jumper at the water heater.
Another school of thought is that the bonding wire helps to complete the electrical ground of the entire plumbing system. Metal pipes are required by code to be electrically grounded, and this is normally done by grounding the cold water inlet pipe to the home. The water heater creates a break between the cold water pipes and the hot water pipes in the home. By bonding the hot water pipe to the cold water pipe at the water heater, it is thought that this helps to ensure that the entire plumbing system will be electrically grounded.
If you read the first sentence of the second paragraph it clearly states that if there is already a mechanical connection between the two systems no bonding jumper is required. Also although I often agree with what they say the NECH commentary is just an opinion not code.
True but we are discussing what was meant. If you can prove that they are bonded then a jumper is not required.
My education is not code nor is the MH forum however I can use those to interpret the code.
I have 4 copper pipes on that water tank and don’t matter which 2, It jumps to 0 every time.
Now you guys got me wondering, I had to check. I have .5 across #6AWG bonding jumper on copper
Mine is not digital Joe, so it won’t read that fine. Touching the leads together or touching two pipes at random, reads the same.
I took my measurement some distance from the bond.
If you’re getting a resistance reading of higher than ZERO across the copper bonding jumper, try cleaning the copper oxidation and trying again
That’s what I’m saying too but opinions vary from they’re never required to they’re always required. I just wish that the NEC would be more concise on this one. They specifically mention water meters so why not mention HWH’s too if that’s what’s required.
It’s new, < 6 months old. I installed it after I moved in because the bonding was screwed up.
Panel was bonded to the water line where it came in from the well, but the previous owner had a really expensing water treatment system installed which was plumbed in PEX interrupting continuity to the distribution piping. Also had 2 CSST runs for fireplaces on an unbonded gas system. So I had to bond across the pex and pick up the cold, hot and steel gas piping.
I measured between hot and cold a good distance from the bond so I had quite a few sweated joints and valve bodies in between. May have been a factor.