This could be a loose connection on the circuit breaker....
This could be a loose connection on the circuit breaker.
After years the connection can become loose and you get some voltage drop with high current loads.
Outdoor boxes are prone to this because of hot to cold cycling.
One question, Do some lights get brighter ?
That would be a open neutral wire back to the pole.
The safety aspect isn't the microwave itself, it's where the heat from the voltage drop is occurring. As wiring itself is very unlikely to deteriorate, the connection points have to be prime suspects, this leads back to a common point where both lights and microwave currents are flowing. Almost certainly if the building is wired properly, that will be the fuse box or circuit breakers, whichever is fitted.
Do an experiment, pull the fuses or switch the circuit breakers off one by one to find which is for the lights and which is for the microwave, they should be on different circuits. If one switch turns both off, you need an electrician to do some rewiring urgently! If they are on different switches, check the switches or fuse holders themselves and for a common connection between them. In Europe, standard wiring would be a bank of circuit breakers with a copper bus bar feeding power to their input side with the output side going to the individual circuits but depending on your location and the age of the installation, your situation may be different.
Could the "unwanted resistance" you speak of be inside the microwave?
Are you sure that it isn't misconnected the Neutral with Earth wirings on the cord extension ? I would dare to say that these cheap ones may have no efficient manufacturing quality control process after assembled.I connected it to a 12-guage extension cord with an LED-lighted plug and the plug dims severely and even flickers.
... This time the electric heater did dim the lights until it was turned off. But it still didn't do it quite as badly as the microwave....
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