wrote in message
I have been in discussions with inspectors about this and the only
real NEC violation with a cord and plug connected furnace motor is the
manufacturer's installation instructions don't say you can do it.
On the other hand I have never seen instructions that specifically
said you couldn't. If you said you were doing this to make the blower
easier to service, THAT is legal.

Technicality, but the motor wiring is not touched, the main wiring (control)
box is.