"mike" wrote in message ...

The electrical code in the US demands that the furnace have
a permanent connection to the power source...no plugs allowed.
But when I asked the electrical inspector if I could put a plug
on it so I could run it from a generator, he said, "no problem".
The electrical code is very strict...except when it isn't.

Now, but when the unit was installed? I know of two units that are
operated that way.

I am not saying that it is right, just that is how they were installed.