<quote> First is remove of equipment already installed due to lack of payment. It is illegal to do so and I am not sure if you can force the owner to wave his rights.</quote>
While this is true, I have a way around it. General contractors are a big problem here in California, once they get their wiring, they forget to pay. I will remove anything I've installed like sub panel or what ever. I do it when I recognize a "safety hazard" related to the installation. The GC will make the usual inane threats, but they seem to pay right away.