megloff11x
Senior Member
Motor disconnects and overload protection is sized under sec. 430. What if your controller is a VFD instead of an on/off switch? VFD's are typically rated a few amps more than the ampacity rating of the corresponding motor HP being controlled. The tables 430.148-430.151 don't take this into account. Or do they?
If I'm using a VFD, do I go by amperage from motor HP ratings, and the method of 430.110 for multiple motors, or do I go by what the VFD says it will draw and multiply that by what "fudge factor?"
If I'm using a VFD, do I go by amperage from motor HP ratings, and the method of 430.110 for multiple motors, or do I go by what the VFD says it will draw and multiply that by what "fudge factor?"