Answer Posted / johince

Multiples of 11 has no role decoded from form factor and anything
like that (I believe). the relation to form factor is just a
coincidence.
In early days when technology has not advanced this much, the
transmission lines consumes around 10% of the total power
transferred. Normally loads are designed as multiples of 10 or
100 KW. So the generation done for required load power +
transmission loss. ie 11KW, 110KW etc. So generated voltage also
was designed as multiples of 11.
Hence the insulators has to be designed for these volatges and
hence the form factor coincidently derived as 1.11.

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