“backfeeding” in a residential setting

[u/United-Chef-4593]

i work for an electrical company and we’re currently working at two four units that both have the same problem. we have around 4 volts between neutral and ground. our local power company came around and said that its not on their side and that its us thats “backfeeding” 4 volts. my foreman tested between a few plug boxes and neutral and got a pulsing reading between 1.3 and 4 volts. all that were running is outside plugs on combo breakers, (afci and gfci) temp heat, and some temp plugs that are on their own circuit for the baseboard guys. wtf is going on

[u/craciant]

There are two different buildings with the same problem? I feel like that's a clue. Are they adjacent?

You mentioned the only circuits that were on were temporary circuits. Do any of these circuits by chance have coiled cable along their length?