Question

What is the usual current rating of the fuse wire in the line to feed application of 2kW or more power?

Answer 1

Like switch, bulb, etc. which are present in electrical circuit boards, we have fuse wire also and is a very important part of the circuit which plays an important role in protecting the appliances from getting destroyed due to heavy voltage fluctuation. It consists of a thin wire which has a very low melting point.

Complete step by step answer:
Fuse wire is present in almost every modern electrical equipment or device. It works on the principle of heating effect of electric current. It works such that when current, more than a particular value is passed through the wire, due to the heating effect of electric current it gets melted. The reason behind the melting of wire is its low melting point. Once this wire gets melted, the current stops flowing into the circuit and hence the equipment gets saved from high voltage fluctuation.
Now, the usual current rating of the fuse wire in the line to feed application of 2kW or more power is 15A. This is the value that is commercially used for construction of fuses. It must be taken care about the selection of material for constructing the fuse wire. If not done so, it could be harmful for the appliance and hence will waste money.

Note: Fuse wire is a delicate material wire. It is made up of zinc, copper, silver, aluminum or the alloys to provide suitable and predictable characteristics. The wire is connected in series with the appliance such that all the current could be passed through the wire first and then reach the appliance. This ensures the safety of the appliance.