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How Can we calculate the rating of a cable?Show the formula?
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Answer Posted / shoebullah
with referance to prof.nazar
answer ... Cant we calculate
voltage drop by this formula
Vd= IZ
where Z= R*cos(pi) + X*sin(pi)
and R= r*1/1000, X=
x*1/1000 ......... I am
suggesting in this way also
we can find voltage drop of a
cable ....... And further we need
to calculate percentage of
voltage drop by this formula
%Vd= sq.root of 3 * Vd/VL
*100
where VL Is line voltage ... It
should be <3% for main
distribution board <5% for all
distribution board
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