memyselfandI
Senior Member
- Location
- Hampton Roads, Virginia
Question: I have a 1/2 HP 480V 3PH motor for a garage door with contoller. The motor has overload protection. I need to feed this motor from an existing 30A 3PH 480 circuit that is available. After doing all my calcs I came to the conclusion that my BC,SC, and GF protection has to be fuses which are set at a value of not more that 2 amps. However 2 amps is not a standard fuse size and I must go up to 3 amp. No data on the controller, only what is on the motor. Is this correct and if not what and where am I doing wrong?