Explain following wiring systems: (i) Concealed wiring (ii) Metal conduit wiring

Explain following wiring systems: (i) Concealed wiring (ii) Metal conduit wiring 
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Answer :

i) Concealed wiring: The cost of wiring is very high. The PVC or VIR wires are carried through the channels made in ceilings and walls at the time of building construction. This wiring is slightly difficult but appearance is very good, so it is widely used. More number of wires can be carried through the different size of channels. Wires are not exposed to the sky, so there are less chances of mechanical injury. Fault finding is difficult. Future expansion is not possible and repairing and maintenance difficult. 


2) Metal Conduit wiring: The cost of wiring is high. The PVC or VIR wires are carried through metal conduit. This wiring is very simple. More number of wires can be carried through the different size of metal conduit. Wires are not exposed to the sky, so there are less chances of mechanical injury. future expansion is not easily possible. Generally metal conduit wiring is preferred in industries or workshops but if there is any earth fault then the leakage current may pass through the conduit and hence now a days it is rarely used.

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