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Please design a copper bus bar system for an enclosure of 2 x 1.8 x 1 mtr. The current rating of the bus is 7000 A rms at 415 V for 180 secs. Thereafter the current is 1600 A rms continuous at the same voltage. While 7000 A is being passed the bus bar should be within permissible temperature...

We always say that copper is a better conductor than Al , this is because the temp coeff of copper is lower than that of Al. But can somebody tell me the connection between copper, temperature and area, or to put it straight how does one arrive at the fact 1 sq mm of copper while carrying 1 Amp...

CAN YOU TELL ME HOW DO I CHECK IF A VOLTAGE (3.3 kv AND ABOVE) IS AVAILABLE ON A BUS WITHOUT THE USE OF PT. IS ANY GADGET LIKE A LINE TESTER AVAILABLE FOR THIS PUPOSE AND IF SO WHERE?.