In Order To Calculate The Current Flowing In A Circuit How to Determine The Correct Size Fuse

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How to Determine The Correct Size Fuse

In the last 5 years, electrical fires have resulted in the loss of property worth billions of US dollars. With many high rise buildings popping up in various cities across this country, it becomes extremely important to have electricians install properly sized fuses in your home to reduce the chances of an electrical fire.

A fuse is a useful safety device that contains a conductive element that allows current to flow through it under normal conditions. If the fuse detects a current overflow that is greater than the fuse’s rating, the element melts, stopping the flow of current.

Using the right size fuse is important if you want to make your home safe in the event of an overload or short circuit. While a fuse that is too small will disrupt a normal power supply, using a fuse that is too large will not be able to stop the excessive current generated during an overload.

Tips for choosing the correct size fuse

According to NEC guidelines, before you hire an electrician to install a fuse, you must ask him to determine the amperage of the circuit. The amperage of the fuse should be slightly higher than the amperage of the circuit. You can calculate amperage by finding the total load or power of the circuit and dividing by the voltage being supplied.

For example, 110 volts AC is supplied to all American households. If the circuit uses 1200 watts, then the amount of current flowing through the circuit at any time will be 1200/110 = 10.9 amps. In such a scenario, it is necessary to use a 15 A fuse in the circuit.

Professional electricians suggest that you take extra care in choosing the right size fuse for circuits that are connected to induction motors or coils of wire. This is because such circuits experience a higher current surge when the power is turned on and would consume less power while the device is operating. In this case, you need to buy a specially designed induction motor fuse or a fuse that comes with a time delay.

When choosing a fuse, you should inform yourself about the type of voltage it would protect. It is possible to purchase a different fuse to protect the AC or DC circuit, or a double fuse can be purchased to handle both types of power supply.

If you cannot determine the correct fuse size yourself, seek the help of experienced electricians in your city to find the appropriate fuse.

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