Page 101 - Electrician - TT (Volume 1)
P. 101

ELECTRICIAN - CITS




           PVC casing capping
           Nowadays wooden casing capping is replaced by PVC casing capping



















           Comparison of different systems  of wiring

             Particulars   Cleat        Casing and        Batten          Lead sheathed    Conduit Wiring
                           wiring       Capping wiring    Wiring          wiring
             Material      Cleats ,     Casing and        T.W batten      T.W Batten       Conduits Bent
                           VIR or PVC   capping (T.W,     TRS/CTS wires  Lead covered      and Sockets
                           cables,      PVC). VIR/PVC     Gutties Screws  wire Gutties     and other
                           screws       wires Wooden      Nails Link      Screws, clips    accessories
                           Gutties ,    Gutties           clips Blocks    Board and        VIR or PVC
                           Block        Screws, Block     and Boards      Blocks           cables Nails
                           board etc    and Boards                                         Gutties Block
                                                                                           sand Boards
             Cost          Cheap        Fairly expensive   Cheap          Expensive        Expensive

             Life          Short        Fairly long       Long            Long             Very Long
             Mechanical    None         Fair              Fair            Good             Very Good
             protection
             Protection    No protec    Bad               Fair            Good             Very Good
             from fire     tion
             Safety from   No protec    Fair(PVC)         Good            Good
             Dampness      tion         Little(wooden)
             Labour        Skilled      Highly            Skilled         Skilled          Highly
                                        Skilled                                            Skilled
             Extension     Easy         Difficult         Easy            Difficult        Not so easy
             and renewal                                                                   and costly

             Time required  Short       Fairly long       Short           Fairly long      Very much longer
             for erection

             General       Poor         Good              Good            Fairly good      Very good
             reliability

             Appearance    Bad          Good              Good            Good             Very good
             Nature of     Temporary    Domestic,         Domestic and    Domestic and     Domestic, Office,
             Application                Office            office building   office building   Work shop






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                                    CITS : Power - Electrician & Wireman - Lesson 20-25
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