Yeah I did put the multiwire ckts on opposite phases, and isolated red on the suspect circuit. black phase seems to work ok, and thats all the HO wanted us to do so we would pass solar pv inspection. I did tell my boss(not an electrician} that the resulted short could still exist and that the HO should get it solved, but thats not in our scope......the previous guy did use scotchloks, not sure and I doubt they were installed properly......maybe I'll get the contract to rewire after his house fire?......CRS
