Electrical Engineering - Cable selection

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Cable selection

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

Total Answers and Comments: 3

Last Update: August 04, 2008 Asked by: eeemalik

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July 29, 2008 07:45:05

anant shelar

Member Since: July 2008 Contribution: 2

RE: Cable selection

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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July 30, 2008 07:25:02

Abhijit_atrangi

Member Since: July 2008 Contribution: 16

RE: Cable selection

The cable selection depend upon the load current because the conductor are design for desired temperature. If the under size cable are used than the heat produced willbe more which will puncture the insulation level and further lead to short ciruit.

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August 01, 2008 07:48:29

Abhijit_atrangi

Member Since: July 2008 Contribution: 16

RE: Cable selection

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.

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