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TECHNICAL ABILITY

1. Demonstration of correct procedure for replacement of fuse.

i) Switch off the power supply for the equipment.

ii) Make sure the equipment is grounded.

iii) Make sure that hands are not wet.

iv) Wear insulating gloves.

v) Replace the fuse with an equivilant current rating.

vi) If the fuse of equivilant current rating is not available, then use the fuse of slightly lesser

current rating.

Note - 1) If the fuse of equivilant current rating is not available then we use the fuse of

slightly lesser current rating because if we would have used the fuse of higher

current rating then in case of over current the main purpose of the fuse will be

defeated as a sacrificial device and the equipment can be easily damaged.

If the fuse of lesser current rating is used then in case of over current it works

as a circuit breaker and hece protects the equipment.

2. Checking Condition of the Fuse.

i) Transparent cylinders (glass or plastic) have a wire running through the middle. If the wire

is broken, the fuse is blown. If the whole cylinder is scorched black or brown, the fuse is

blown and there may be a major short on the circuit that needs repair (especially if the

replacement fuse blows after a short time). The fuse can be tested by two methods:-

a) Test continuity if available - Most digital multimeters have a continuity setting, which is

labeled with a series of parallel arcs: ))). Turn the dial to this setting, then place the two

probes at opposite ends of the fuse. If you hear a constant beep while they are touching

the fuse, the fuse is still good. If you don't hear anything, the fuse is blown.

b) Set the multimeter to test resistance - This setting looks like the Greek letter omega Ω.

The resistance setting sends a small current through the fuse, and tests how much

current goes through. We don't really care about the exact resistance reading, but if the

fuse is blown, we won't get any resistance reading because the current will not be able to

pass through the broken wire.