OK, we just had the opportunity to try out the microwave while using the a/c (as we have the a/c on non-stop right now). The circuit tripped! Our fridge was on electricity and we had the water heater on also. Sooooo then we switched the fridge over to gas and re-tried the micro again (with a/c running); the circuit didn't trip... yea! Thanks Eric (Sweet74) for the suggestion.