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

what is the electricity

3 Answers  

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I hv a question regarding power factor improvement just after transformer. I request you to reply me plzz. thank you sir. My friend has a small unit of fabrication. in his factory the main load is a welding machine, lathe machine, grinding machine. this load is not continuous type. now our electricity board has installed 16 KVA, 11000/433 V transformer for our factory. In the energy meter (trivector meter) at LV side of transformer, i hv seen power factor value of 0.15 only when only 3 KW load was flowing. Further electricity board has suggested to install 4 KVAR capacitor at LV side after energy meter. Now my question is that if we permanantly install and switch on 4 KVAR capacitor after energy meter, during some load on transformer and also without any load on transformer, wht will be the power factor shown in energy meter?i dont want to get any penalty by electricity board, so plz suggest me if i can permanantly install and switch on the 4 kvar capacitor or not at LV side of transformer just after energy meter? Thank you again and awaiting for ur positive reply soon.

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