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 ?

59) Which one of the following is the most suitable fish wire to be used in conduit runs having more than a couple of bends ?