If the problem is not confined to the microwave oven, it shows up with other power appliances too, then the problem lies outside the microwave oven. It is very likely your house wiring is divided (or made up of) several circuits. Each circuit is protected by its own fuse or circuit breaker. It is easy to identify: remove each fuse and see which lights or power points go off.
The question I am asking is whether the effect is seen only in the circuit in which the microwave oven is plugged in OR all lights are getting affected (effect is seen in other circuits too). If the dimming effect is seen in all the circuits, the cause is beyond - it is close to the meter box or the connection from the meter box to the inside. You need to track the source of this "loose connection" that is failing under high current. If you have an air-conditioner, turn it off during these tests.
This only indicates that the new product best meets current energy efficiency standards, but from what you have indicated the problem persists. This type of equipment should not cause such an impact on your home's electrical grid.I bought a new 1100-watt microwave (does not have an inverter, nor does the old one). It also dims the lights, but not quite as bad
fuse for the circuit the microwave is on mysteriously blew out (microwave was on, as was a 500-watt AC on the same circuit).
I forgot to mention that about 2 months ago the fuse for the circuit the microwave is on mysteriously blew out (microwave was on, as was a 500-watt AC on the same circuit)[\quote]
I have not heard about an AC so small; but every time you replace a fuse, it is time to take a look into why it went in the first place.
Yes it is older wiring/panel and we've been aware of this (30 being too much) for a long time, which is why we mapped the circuits so that we can carefully manage the loads. New wiring and breaker panel would be ideal, but just not financially possible now.
In the (good) old days, engineers used to install wires double the required capacity. Today they would not space any excess capacity. Your problem is almost certainly due to a loose contact near the main junction box. Most likely at or near the point the cable enters the building. Once that is fixed, everything will be fine again.
I will examine the panel tonight in darkness when the microwave and other items are on. There are 4 round screw fuses, not breaker switches
Last night I observed the panel and the outdoor connections in darkness and listened carefully. There was no visible sparking or unusual noises that I could hear.
water heater is electric. I know that's a huge wattage draw (two 4500 watt elements?)
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