Answer / muhammad qasim

Dear, All those specification you described in your question
are cared while manufacturer design their product. Designing
contains many complex parameters to be cared while deciding
about the metallurgy, insulation. All good manufacturer care
worst operating conditions when they design their products.
When we go for their usage in industrial sector, main things
we need to assure are that:

1- Current Raging
2- Voltage Drop should not exceed the permissible level
3- Cable should have withstanding capability for transient
short circuit and thermal capability.

Normally, copper have current density of 1000 A/Sq inch
which becomes 1.8 A/Sq mm. and all cable and bus bars should
be designed 150% of operating rating for safety purpose.

Secondly, Conductor area is not affected with voltage level,
50 A at HT or LT shall require same conductor area but
insulation level shall be affected. For HT you need XLP and
for LT you need PVC-PVC cables.

Further if you get better answer please copy the same to
muazmi02@yahoo.com

Regards

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