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how to choose the cable rating for load (KW)? EXAMPLE.50KW load
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Answer Posted / mohammad farman khan
Fisrt calcultate Load in Ampere as basic formula below
I (Amp ) = P ( KW) / 1.732*Voltage (400 or 415 or 380 )*
p.f
Voltage depend on frequency rating (50 Hz or 60 Hz)
then check where you have to laid in AIR or Ground
you have to consider so many factor.
suppose you laid in Ground then factor to be consider as
below
(1) Soil Thermal Rseistivity
(2) Group factor
(3)Rating factor of ground temprature
(4)Rating Factor depth of laying
then calculte Voltage drop on behalf of amper rating by
load.
once you calculate then check length
V.D = mv x I X L/1000 OR mv =V.D X 1000/IXL
VD= Maximum acceptable volt drop (in volt)
mv =appropriate volt drop (in mv /amp /metre
I = Current per phase (in ampere)
L= Length ( in meter)
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