I have an electrical current detector that is beeping positive on the 2/6 studs that the 12/3 romex three way wire runs through. The door header that the wires run over at one point also continuously beep positive if I touch the southward current/voltage detector to it. If I turn off the breaker for the light switch, cutting power to the wire, the studs are no longer beeping positive for current. I pulled the wire myself. I also installed the breaker box in this new construction shop. 1/2 I have spray foam insulation in the wall some of which is on the wires. My studs are open so I can see most of the wire and don't detect any breaks. Could this be a ground issue? or perhaps the spray foam is conducting the field? Of do I need to pull the wire and rerun it because this means my have a leak into the stud. And most importantly, is this a fire issue. Any suggestions.
Unless you detect high voltage on the stud, which could be possible if there is a open-ground, or a open-wire from the source or from a control box, to your junction box or electrical outlet, (and these studs I assume are metal since it's commercial area)
I would look for open-wire, bad ground in the electrical outlet or bad electrical detector. Most of recent study have demonstrated that spray-foam can be applied directly on wire (I personally worked many times with this in new or renovated place).
Where it could be bad, is on small wire; Phone lines, fire alarm line, small wire gage since there is gas in spray-foam and could eat the plastic around the wire.
You said this wire is 12/3, there is no way spray-foam could have damaged the wire. But using that kind of electrical detector, can lead to hazardous results and not accurate ones.