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parallel cable sizes


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#1 Ramesh Swami

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Posted 29 July 2006 - 10:44 AM

I have 300 sq. mm cable and now current is exceeding the cable capacity by 20%. can I use 95 sq.mm cable in parallel with this existiing cable .

#2 bob

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Posted 30 July 2006 - 06:13 AM

Dear Ramesh Swami,

This is prohibited under relevant regulations, parallel cables should be of the same cross section and same material.

Regards.

Bob

#3 bob

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Posted 30 July 2006 - 06:28 AM

Ramesh Swami,

If I may add a few more comments.Cables may otherwise be connected in parallel provided that they are of exactly the same type, run together throughout their length, have no branches and are expected to share the total circuit current in proportion to their cross-sectional . In the event of a fault, the cables should be allowed to withstand the allowable fault current without damage until the protection functions.
Hope this helps.

Bob

#4 marke

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Posted 30 July 2006 - 10:52 AM

Hello Ramesh

Welcome to the forum

Provided that the cable is not connected to the output of a VSD, it may be possible to reduce the current sufficiently by adding power factor capacitors at the end of the cable.

What is the load connected to the cable and what is the power factor??

Best regards,




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