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I want formula to calculate cable size as per load given in
kw & amp.I searched many sites but didn't right answer.Plz
reply me asap.
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Answer Posted / santhosh
as one of our friend said above
for Al its 1.2 amps and for Cu its 5.0 amps per 1 Sq.mm
but actually its
1 .0 amp for Al and 8-12 amps for Cu [per 1 Sq.mm].
the basic thing is that suppose a cable for load of 100 amps is to be laid then
for Al 100 amps/3 phases=33.33 amps/phases,
as we don't have 33 amps cable take 36 Sq.mm cable (near and above the value) i.e,3 C*36 Sq.mm.
for Cu consider 8 amps for Cu
then 8 Amps*5 Sq.mm =40 Amps per core or phase
i.e,for 100 amps load u need to lay
a cable Al= 3 Core *36 Sq.mm
and for Cu =3 core *5 Sq.mm
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