Lost a phase on the 600 volt service in my brother in law's shop. Turns out a fuse was blown. Replaced it and it blew again even though I isolated everything outside the splitter box. Called in my electrician and he can't figure it out. Three electricians and me stood there not being able to figure out whats wrong. All the safety switches coming off the splitter are shut off and there is no problems coming from the safety switch to the splitter and no problems in the splitter it self. Has anybody heard of anything like this?