I recently bought a new manufactured home. There are instances where people have touched the front door and received an electric shock. Using a non-contact voltage detector, I confirmed that there is detectable voltage present. Using my meter, I see 72V from the frame to ground.
I have an outside meter on a pole, a disconnect box underneath it, and have wiring in sch 80 electrical pvc conduit running under my house feeding up into the breaker box.
I asked a friend to come and look, and he suggested that I needed a ground wire from the outside disconnect to the inside breaker box. I have a grounding rod connected to the outside disconnect and 3 wires running through the conduit (2 hot, 1 neutral) into the house. There is also a bare copper wire running from the grounding bar in the breaker box that is lugged to the frame under the house.
My first thought was that a screw in the door facing had nicked a wire. After removing every screw, that does not appear to be the cause. Likewise, the problem seem intermittant and isn't experienced on other doors in the house.
Do I need a grounding wire from between the breaker box and the outside disconnect? If so, would I achieve the same thing by running a ground wire from the breaker box to a different grounding rod since it will be ridiculuously hard to try and feed an extra wire back through the conduit now?