WARPP ENGINEERS PVT LTD
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EMAIL - service@warpp.co.in
If the machine is a single-phase machine then each KVA would
require around 4.6 Amps of current. That means if input KVA of
the machine is 5 KVA, then it would draw 23 Amps at full load
If the machine is a three-phase machine then each KVA would
require around 1.4 Amps of current. That means if the input
KVA of the machine is 5 KVA, then it would draw around 7
amps of current at full load
Cable capacity for copper cable can be taken as 5 Amps / Sq
mm when cable length is less than 10 meters. That means 1 sq
mm cable can carry a current of 6 Amps of current
Now you have
input current of the machine based on its input KVA
You can calculate the conductor size by this formula
Input current / capacity of conductor
Example
From the above for a single-phase machine of 5 KVA you would
need 23/6=3.8 Sq mm cable. (You can choose 4 sq mm cable)
From the above for a three-phase machine of 5 KVA you would
need 7/6=1.16 Sq mm cable. (You can choose 1.5 sq mm core
cable for each phase)