Correct option is B
Conduit wiring system consists of either VIR or PVC cables taken through tubes or pipes and terminated at the outlets or switches / sockets. The tube or pipe is known as “conduit”. Conduit wiring may run over the surface of the walls and ceiling or may be concealed under masonry work.
· Conduit wiring system is commonly used for domestic purposes.
· Conduit wiring system is more expensive.
· Its durability is very high.
· It requires more skilled labour.
· It looks good.
· It can be used up to 650 volts.
