I am trying to identify the cause of a voltage drop. When there is a high load, it seems to affect the voltage throughout the house - dropping as low as 170v (from 230v) - clearly this isnt good.
I have a multimeter. Anywhere in the house I take the reading is showing the reduced voltage. If i take it on the consumer unit, it shows the reduced voltage. If i take it on the breaker connected to the meter, it shows the reduced voltage. When I reduce load, the voltage goes back up.
Does this sound like this is something in my house, or it it an upstream issue with the load? Is there any way I can identify where? Ive tried tripping breakers, but obviously that reduces the load from that circuit, thereby bringing the voltage back to normal levels, making it hard to isolate the problem circuit (if it is a specific circuit at all).