Why does the voltage drop when the load is connected?
Yesterday I changed the water heater. After a short work, the light began to blink very strongly. The heater is flowing and works only when water is supplied. I turned off the heater from the water, turned on the water - blinking continued, but became weaker. I unplugged the heater from the mains. Now when you turn on any more or less serious load, the kettle or air conditioner goes out very much, the voltage drops to 130 Volts. He turned off all the machines, checked on all sockets - the voltage drops, but the machines do not knock out.
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Most likely, the wiring was damaged somewhere - the contact in the junction box, in the shield, could be broken. It is also possible that the cable in the wall was twisted from several parts - this is found, especially in old wiring. The instantaneous water heater is a powerful consumer and before it was included in the network it was necessary to clarify whether your wiring is designed for such a load. In any case, if the light blinks - this is an abnormal phenomenon and you need to check all the wiring. A voltage drop is a clear sign of a wiring failure. The machine will knock out only during overload or short circuit.