My household circuit has an effective voltage of about 220 volts most of the time (98% of the time). There are cases when the voltage is to high: 250,300,350 and burns most electronic devices. How can i fix this problem?
I was thinking of putting one electrical fuse of 220V before the voltage enters the house. In case of high voltage, I'd need only to replace the electrical fuse. Is this a good idea? If yes what kind of electrical fuse do I need?
Update!!!
I must mention that this is the box with electrical switches,before the voltage enters the house, it passes through this box.The first switch in the left,goes off in case of short circuit. The first switch in the right controls all the switches, and the other switches controls each switch each room.
Best Answer
Circuit breakers don't provide protection against over-voltage. They might in extreme circumstances where over-voltage causes an over-current situation, but that protection occurs too late, after the electrical appliance is smoking.
What you really need is a power conditioner, also known as a voltage conditioner. They are expensive even for small loads. A whole-house conditioner might run $15,000. But to target just a few appliances, there are some around $1,700. See this and this.
If this is not a temporary power situation, you might consider a whole house standby generator. The deluxe units switch to generator power not only when the voltage goes low, but also when it goes too high.