I live in a older mobile home that sits on a concrete slab about 3 feet off the ground at my work. I recently had a visit from the gas co. They wanted to replace the old gas meter but apparently found voltage coming from the meter that registered from 1 to 4 volts depending on where it was tested. This includes earth ground and even the mobile home itself. The gas meter sits just above the dirt next to the fence and a galvanized pipe runs from it across the concrete slab approx. 12 feet where it bends upward and runs along the frame branching off to the dryer and then to the water heater ,heater, and to the oven. There is a ground clamp and wire attatched to the trailer frame and gas pipe about 8 inches long. I was told i needed to have a electrition correct the problem before they could continue. I was reading another similar post here but thought i would be specific as to my situation before calling anyone out. Is it possible to trace this out myself by cutting the individual breakers and checking for voltage to narrow it down or is that a waste of time? Btw, i am of corse not a professional but like to learn.
I would pay a professional electrician to inspect and remake the grounding arrangements, check the voltage on the gas equipment and provide a certificate (depends on your part of the planet, where I am it would be an EICR for the whole electrical installation, but I'd get the electrician to provide a written report of some sort with his registration number and signature on it)
You could have an interesting problem. It could be cathodic protection but that should be no more than 2V and the gas company man should be familiar with cathodic factors. Because it is a mobile home park , the developer may have buried gas, water , power and telephone lines in the same ditch. AC Power lines can induce voltage on parallel lines . It would depend on the proximity, the parallel length , the voltage , and other factors. People have been electrocuted by voltage induced in pipelines lying on the ground ( during construction ) along high voltage transmission lines ( 50 ft + above).