Cable selection

Why Cable selection depends on Load current? (UG Cables & OH lines)

Questions by eeemalik   answers by eeemalik

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anant shelar

  • Jul 29th, 2008
 

Cable selection is based on the load current to enable the core of the cable to conduct that much current & also the selction / size of the conductor / material of the conductor (Cu/ Al ) depent on laod current.

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Abhijit_atrangi

  • Aug 1st, 2008
 

Cable selection depends upon following factors
1) Current : a) actual current
b) design current

Design current is more than the actual current it will carry.
Cables are always designed for a larger current considering the
1) Environment conditions viz, temp., soil in case of UG cables, no. of cables running parallel to the cable in consideration (grouping factor),

2) Kind of fitting,
3) Voltage drop per meter,
4) Conductor material.

It is combination of these factors which decides the cable selection in addition to cost.

babu

  • Mar 21st, 2012
 

800A current, how is calculate the shout able cable

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raju

  • Apr 6th, 2012
 

Voltage is directly proportional length, current is proportional to area of cross section of the wire.

soumendasbiswas

  • Apr 26th, 2012
 

Cable selection not only depends on the load current but also depends on Temperature, Length (Distance between LT Switchgear MCC/PMCC to Motor). If load is increase then current will also increase if we select less size cable then it will cause overheating which will damage the insulation of cable.......

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