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
