why HT voltage rating in multiple of 11

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why HT voltage rating in multiple of 11..

Answer / ee

since the word elecrticity has 11 letters

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why HT voltage rating in multiple of 11..

Answer / hore_aec

It is nothing but a joke.
If HT voltage rating is always in multiple with 11, then
how we get 25kV,400kV,800kV?
It is a standard of AC voltage to maintain.

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