A
This is kind of a "back to basics" question that I thought I could ask the pros who do this regularly. I've recently run into an application regarding selecting a fuse for a motor. In my case it is a single phase 230V supply going to an inverter for a 2HP application. In looking in the NEC book all it says is that you should not select a fuse less than 125% of full load current, but does not mention anything about max fuse size (that I can see). I realize that a time delay fuse is needed for motors.
Should I be upsizing my wiring to handle up to 125% -> 200% of the full load current? How will the motor be protected by such an upsize in fuse? If there is anywhere in the NEC or other handbooks I can reference please let me know where to find this.
If using a motor starter (i.e. no inverter in the mix), is it typical to use the fuse to protect the wiring for 150-200% of full load current, and then set the motor starter dial to the actual full load current in order to protect the motor itself?
Thanks
AnonymousMan
Should I be upsizing my wiring to handle up to 125% -> 200% of the full load current? How will the motor be protected by such an upsize in fuse? If there is anywhere in the NEC or other handbooks I can reference please let me know where to find this.
If using a motor starter (i.e. no inverter in the mix), is it typical to use the fuse to protect the wiring for 150-200% of full load current, and then set the motor starter dial to the actual full load current in order to protect the motor itself?
Thanks
AnonymousMan