What size was the overcurrent protective device? You can supply a “big” receptacle at less than its rated capacity. The rating of the receptacle is the potential “heavy duty-ness” of the receptacle.
When evaluating large, high-current receptacles, check for:
The receptacle has a rating at least as large as the overcurrent protective device (fuse or breaker)*]The branch circuit conductors serving the receptacle have a rating the seems to meet or exceed the sizing required for the fuse or breaker that serves the receptacle.
Problems to look out for:
Branch circuit conductors smaller than required for the overcurrent protective device*]Breakers or fuses larger than the rating of the receptacle
A “large” receptacle on a “small” circuit is no problem at all. The breaker will trip if someone, for instance, tries to weld at a full 50 amps with a large welder.
Right… you can always put a “big” receptacle on a “small” circuit if you feel the need. The only time you’re allowed to put a “small” receptacle on a “big” circuit is the special exception that permits 15 amp receptacles on 20 amp circuits.
That chart in post 6 of that thread is for circuits with 2 or more receptacles. That chart is taken out of context with respect to this thread.
A single receptacle on an individual branch circuit has to have a rating at least as much as the circuit, and that is the only requirement. You could put a 100 amp receptacle on a 15 amp branch circuit if you wanted to, in the case of a dedicated circuit.
If you have more than one receptacle on the circuit, then and only then, that table you linked to applies.
I am curious as to what the instructions have to do with anything.
All I would see is a receptacle and would not care what is plugged in.
Is it wired properly?
Is the circuit sized properly?
Is the overcurrent sized properly?
You are inspecting the house and the wiring. NOT the kiln.
IMO even considering what is being plugged in to a receptacle is far beyond the scope of a home inspection.
OK, I have discovered electric ranges installed in a basement at the electric dryer location that were supplied with a 30 amp cord. I believe that an inspector has the authority to check for stuff like this. I do it all the time at my seminar hotels.