I'm having my council house rewired. I have an existing out building with high demand appliances running on 3 phase inverters. It has its own fuse board with a 50a main circuit breakers running to a 50a smaller breakers in the main house fuse box. They now tell me that they that they cannot get a 50a breakers for the house fuse box and proposed to put a 32a instead..is this safe and acceptable?? Sorry for the lack of knowledge I'm no electrician