Page 89 - Electrician - TT (Volume 1)
P. 89

ELECTRICIAN - CITS






































           In large buildings, if only one distribution board were used, some of the point would be at a considerable distance
           from it. and in such cases it is advisable to employ sub- distribution board either to save cable or to prevent too
           great voltage drop at the more distant point.in such cases main DB controls the circuit to each sub-DB as shown
           fig. the sub distribution board are installed near the load.


























           Advantages

           •  Fault finding is very easy.
           •  The voltage available at different point of the circuit will be same.
           •  Renewal or extension of circuit is easy.
           •  Good appearance.
           Disadvantages

           •  Length of cable is more.
           •  So the initial erecting cost is more





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