When I turn my microwave oven over the stove on, it will cause a motion sensor light in the hallway next to the kitchen to got off and on. This affect can be reproduced anytime. I did notice that we stand in front of the microwave instead of out of the room, the motion sensor light goes on then off then on repeatedly.
How is the microwave affecting the motion sensing light that is about 4 ft. away behind a plaster wall? Is it dangerous?
Best Answer
Most likely is electrical noise being coupled back into the mains wiring from the microwaves power supply. The microwaves are generated by a magnetron that uses high frequency and high voltage supplies, these are probably noisy in a cheap consumer appliance.
Fridges were always notorious for spoiling hifi listening when the compressor motor kicked in and sent spikes down the mains wiring.