My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

0 Answers   Premier,

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how to make an earthing certificate

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4 Answers   HCL, SSC,

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1 Answers   Integra,

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0 Answers   HMK,

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0 Answers   UPSC,

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3 Answers  

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in which base we defined the conductor is Dog type, Squirrel type, rabbit type, wolf type etc used in transmission line?

3 Answers   Bhel, CIL,

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