I am looking for a litle guidance about somthing that is driving me crazy whilst trying to size a motor conductor/fuse combination (Using NEC Code).
I have a 75HP AC motor (regular NEMA frame 1.15 SF)with seperate O/L protection so the fuse is SC and GF protection only and I want Type 1...
Does anyone have any thoughts / experience with using circuit breaker type disconnects over fused switches?
I have used both in the past but always worry about fault levels when using cricuit breakers as it is often very difficult to estimate actual fault currents.
My applications are typically...
When adding a name plate to a control panel with the voltage / current rating etc.. How should the KA of the PANEL be rated for the name plate (ie NOT how is the ka of the supply deterimined). Should it be based on the lowest KA rated device that is connected directly to the incomming supply...
