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%.
