How to calculate the cable size for particular load
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Answer Posted / guest
The most important criteria for the calculation of cable
size is the
a)load amps b)Voltage drop due to distance, c)The amp
rating of the breaker that is going to be connected. d)type
of cable d)how and where the cable is going to placed.
With a known particular load say 250 amps you may also
already know the distance and the type of cable you are
going to use say xlpe single core or 3core in trunking or
under ground.
From the cable table under the correct appropriate amp
rating the cable size is selected. The voltage drop can be
calculated now, If necessary the cable size is increased to
meet the requirement.Than finally the amp rating of the sub
cct breaker is determined.This breaker should be able to
protect the cable and allow for the use of the particular
load.
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