Not wanting to do any more thread jacking on the air conditioner thread...
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The point is as far as the NEC is concerned it does not mater what your plugging into the circuit it only matters where there receptacle is located.

It's the very same in several European countries. For example in Austria every receptacle 32A and smaller HAS to be protected by an RCD with no more than 30mA trip current. And I never heard of any problems with that, not even running 1960s vintage refrigerators. Right now we're running 2 refrigerators and an upright freezer on one RCD and had ONE inexplicable trip in over 10 years!