What is diversity factor and how to calculate it?

By Bharat Ribadiya -
The whole load is not use at a same time in office or home. We do not use the all equipment at same time. There are some equipment are ON and some are OFF. In home we do not switch on all the lamps, fans, AC, water heater, electric iron etc. Therefore,the diversity factor is need to be consider while selecting wire size for electrical wiring installation. The diversity factor can be calculate by following equation.

Diversity Factor = Total Connected Load / Actual Maximum Load

You can neglect diversity factor in case of final sub circuits where connected all loads not operate at same time.

Example:-In a flat, the max demand of load current is about 85 A and Loads are as follows.

Connected Load
Amperes
Maximum to be expected
Amperes
Three 15 A socket outlets
45 A
100% of 1 socket (15A) + 40% of reaming 2 socket
27 A
Four 5 A socket outlets
20 A
100% of 1 socket (5A) + 40% of reaming 3 socket
11 A
Water heater
6 A
100%
6 A
Lighting points
7 A
66% of load
4.5 A
Water pump
4 A
30%
1.2 A
Air conditioner
8 A
30%
2.4 A
Total load
90 A

52 A


But, by using diversity factor the total required load is about 52 A. So, use 52 A + 20% for future load the total required load current is 62.4 A instead of 90 A for installation of wiring.
                             

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