Page 116 - Electrician - TT (Volume 1)
P. 116

ELECTRICIAN - CITS





                                                          Symbols used in the circuit      Symbols used in
            Sl. No.            Description
                                                                   diagram                      layout
              14    Earth point




              15    Circuit breaker




              16    Terminal strip




              17    Link (closed)





              18    Plug and socket (male and female)




              19    Ceiling rose

                    N.A: Not applicable

           The B.I.S. Symbols used in the wiring is given here.


                        ITEMS                 SYMBOLS                       ITEMS                 SYMBOLS
            I    Wiring                                         II    Fuse-boards
            1   General wiring                                  1   Lighting circuit fuse-boards
                                                                   a  Main fuse-board without
            2   Wiring on the surface                                 switches
                                                                   b  Main fuse-board with
            3   Wiring under the surface                              switches
                                                                   c  Distribution fuse-board
            4   Wiring in conduit                                     without switches
               a  Conduit on the surface                           d  Distribution fuse-board with
                                                                      switches
               b  Conduit concealed
                                                                2   Power circuit fuse-boards

            The  type  of  conduit  may  be                        a  Main fuse-board without
            indicated, if necessary.                                  switches
            5   Wiring going upwards                               b  Main fuse-board with
                                                                      switches
            6   Wiring going downwards                             c  Distribution fuse-board
                                                                      without switches
            7   Wiring passing vertically                          d  Distribution fuse-board with
               through a room                                         switches







                                                           103

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