I have a issue with a small 30 KW X Ray machine that I wired, it is wired with #2 copper and 125 Amp circuit breakers. The machine trips both the circuit breaker breaker in the main electric panel and the circuit breaker in the disconnect panel at the same time when an exposure is taken. It occurs when the first exposure is taken on the day or if the unit sit for a while not used then the first exposure taken it will trip. this does not happen every day or all the time it is very random. The X ray unit has been completely changed and the power coming into the room has been tested and we only get a 1 volt drop during the exposure for a split second. the length of wire is not more then 25'. I'm at a lose and don't know where to go from here.