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Initial Surge

Many electrical appliances use an initial surge of electricity when switched on.

This should be taken into account when calculating fuse ratings

The example cited below assumes an initial surge of 10%

An appliance uses 2000 watts and has an initial surge of 10%, what is the fuse rating?

First, calculate the watts with the surge (2000 + (10% of 2000)) = (2000 + 200) = 2200

Then calculate the fuse rating
(2200 ÷ 230)

Answer 9.56.

In a multiple choice exam, you should take the closest choice to your answer.