# Short Circuit Calculation - Lighting Wire

 Do we need to consider a short circuit calculation in lighting wire? asked 12/24/2013 student5

 calculate using formula K²s² = I²t . K= constant depending on material of conductor(Ref BS 7671),s= cross sectional area of conductor ,I = short circuit current flowing in that circuit & t = time for which short circuit current flows. answered 12/30/2013 ram31 66 As per the IS in each lighting circuit there should not be more than 800W, if we follow the rule, and the distribution transformer its impedance is usually 5% so calculating the Isc it is almost it is 7.2KA but manufacture,r manufacture 10KA so we usually use current rating of that equipment/Plant with Isc KA answered 12/29/2013 Sathya Narayana JE E/M 46

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