Electrical Busbar

Yes. Google can.

This information is readily available on the web! All you have to do is look

And, you should have read the FAQ's BEFORE POSTING HERE, then you would have seen this:

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Why don't you have this??? List Of Indian Standards For Electrical PDF - Freedownloadb.org

So, don't expect others here to do your work for you.

Busbar itself does not have a thermal rating.

IS 8623 ( Part II) 1993 gives Particular requirement of Bus bar. Government of India CPWP has published General specification for electrical works Part IV Substations 2013. This document gives most of the Indian standard specification required for electrical Panel design. As per this document the maximum permitted temperature rise of bus bar is 40°C above ambient temperature.

When Aluminium Bus bars are used a lower temperature rise is recommended for Bus bar design.

BS 159 stipulates a maximum temperature rise of 50°C above a 24 hour mean ambient temperature of up to 35°C, and a peak ambient temperature of 40°C.

ANSI C37.20 alternatively permits a temperature rise of 65°C above a maximum ambient of 40°C, provided that silver-plated (or acceptable alternative) bolted terminations are used. If not, a temperature rise of 30°C is allowed.

Thanks a lot V. I. Abraham... i will check it out..

For Selection of material and size of bus bars for short time and continuous thermal withstand rating, I would recommend Switchgear Handbook published by ABB (earlier this handbook was published by BBC, and after integration of Asea and BBC now by ABB). This is not sold in the market. You can have it either from ABB in India or may find soft copy on Web.

This gives basic DC current rating for bare as well coated Bus Bars of Al or Cu at 30 Deg C and 70 Deg final temperature for various configurations.

Then curves are given for various correction factors, for different ambient and final temperature of conductor, 50HZ or 60HZ frequency etc.

The final temperature of conductor will depend on temperature rating of bus bar supports, thus by selecting better bus bar supports, you can select relatively smaller size of Al or Cu. By better quality bus bar support I mean, example fibre glass reinforced epoxy instead of Bakelite moulded. Them now a days amino based epoxy are available which can work continuously up to 155 Dec C and higher against 90 Deg C for Bakelite - hence there can be great saving in cost of Bus Bar material if we select a higher temperature rated bus bar supports.

Calculations are also available in the hand book to check short time electrical and mechanical withstand capacity of bus bar and Support System.

I am out of India and can not have access to my personal copy of the handbook, otherwise I would have mentioned the pages/ chapter etc. for ready reference. But it is very simple to use - once you lay hand on it - because example of calculations are also available.

Thanks a lot for your suggestion. I have downloaded the ABB switchgear manual. Currently i am going through it. I think it might provide the information that I need. I will keep you updated about my progress.

AN independant report ...

http://www.copperinfo.co.uk/busbars/pub22-copper-for-busbars/homepage.shtml