Answer / mohideen

it is due to the form factor always being 1.1

Answer / kareesh

rms value= formfactor*averagevalue
form factor =1.1
so volatages are always multiples of 1.1

Answer / satyavir

Because we have allready asume that voltage drop in line
will be 10%.so after losses in voltage we can get at the
source point in the series of 100v,200v,400v.so we use
110v,220v,440v,voltage series.

Answer / vmd

THESE ARE THE TRADITIONAL VALUES THESE ARE IN PRACTICES
FROM MANY YEARS

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