54) The radius of bends used in conduit wiring should not be less than :

55) The surface conduit wiring saddles should be fixed at intervals of not more than :

56) The thread on conduit pipes in all cases should have a length of range :

57) Which one of the following is the suitable pitch of hacksaw blade for cutting a heavy gauge conduit pipe ?

58) What is the wall thickness of 25 mm heavy gauge metal conduit pipe ?