Master built electric smoker tripping the circuit

Got a trimmed up beautiful USDA Prime 6 pound brisket that I rubbed last night, woke up and put on the smoker at 6 AM, got it going, went back to check on it 45 min later expecting to see and smell plenty of smoke and the damn thing had tripped the breaker, reset and tripped again, changed to an outlet on a different circuit and as soon as the heating element kicked on it tripped too. I am pissed, put the brisket in the oven and when I cool down I will go back and investigate and try to find the problem, any suggestions on what to look for?

I have used this smoker 5-6 times on the same outlet and has always been problem free

In before "should of used charcoal and you would not have this problem"