17) Which is the distance of saddles to be fixed from the centre of bends (or) couplings in metal circuit wiring?

18) Which is the alpha numberic rotation for apparatus AC 3 phase system?

19) Which is the minimum size of copper conductor used for power wiring in commercial wiring as per IE rule?

20) Which is the minimum size of PVC conduit used in government installations prescribed by CPWD?

21) What is the first step taken during preparation of estimating the material required for any type of wiring installation?