Introduction Theproper sizing of an electrical (load bearing) cable is important to ensure that the cable can: |
1- Operate continuously under full load without being damage.
2- Withstand the worst short circuit currents flowing through the cable.
3- Provide the load with a suitable voltage (and avoid excessive voltage drops).
4- Ensure operation of protective devices during an earth fault.
GENERAL METHODOLOGY
All cable sizing methods more or less follow the same basic six steps process:
1- Gathering data about the cable, its installation conditions, the load that it will carry, etc.
2- Determine the minimum cable size based on continuous current carrying capacity.
3- Determine the minimum cable size based on voltage drop considerations.
4- Determine the minimum cable size based on short circuit temperature rise.
5- Determine the minimum cable size based on earth fault loop impedance.
6- Select the cable based on the lowest of the size calculated in the 2, 3, 4 and 5.
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