Sometimes ducts are made into the walls. This is called skirting. The advantage of this is, because the entire distribution fuse boards are installed on the walls, therefore connections are easily made. The ducts are covered with metal or concrete slabs. In ducts cables are easily installed. Ducts are made according to circuit cables. The size of cable, width, thickness all factors are calculated and in last, the size of duct finalized. In ducting system we use armoured and sheathed cables. P.V.C and V.R.l cables are not used in ducts because the insulation of these cables are very thin and chance of mechanical injury are very vast and risk of short circuit is also possible. The advantage of this system is that, in large buildings, the alternations and additions are possible, therefore if we use ducting system, the wiring system remains the same and alternations are easily possible.
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