# As per IE Rules, the terminal voltage must be within the ________ range, if the nominal voltage is 240 V.

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As per IE Rules, the terminal voltage must be within the ________ range, if the nominal voltage is 240 V.

1.

225 V to 255 V

2.

228 V to 252 V

3.

220 V to 260 V

4. 215 V to 265 V

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Correct Answer - Option 2 :

228 V to 252 V

India Electricity Rule No. - 54

A supplier shall not permit the voltage at the point of commencement of supply to vary from the declared voltage.

a) In case of low & medium voltage, the variation not more than by 6%.

b) In case of High voltage by 6% in the higher side and 9% in lower side.

c) In case of extra high voltage by 10% in the higher side and 12.5% in lower side.

Calculation:

± 6 % of 240 V

$± \;\frac{6}{{100}} \times 240 = \; ± \;14.4\;V$

Required voltage = 240 ± 14.4 V

Required voltage = 225.6 & 254.4 V

Therefore voltage should not drop below 225.6 V and should not exceed by 254.4 V.

So the correct range will be 228 V to 252 V.

India Electricity Rule No. - 55

Variation in frequency of A.C supply should not be more than 3%.