Because all residential electrical outlets are never used at the same time, the NEC® allows a diversity or nothing to be used when sizing the general lighting load for electric services.

The coincident factor is calculated by dividing the system's maximum demand by the sum of constituent maximum demands.

Therefore, the final answer is "coincident factor".

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Conincident factor        

Explanation:

Coincident factor is derived as the Maximum Demand of System divided by the Sum of Individual maximum Demands.

Diversity factor is the proportion or percentage of the total of the peak demands of each unit within the various subdivisions of a system in relation to  the total demand of the  whole system, or any section of the system.

After calculating the diversity factor the result must be greater than 1.

Cheers

1. b

2. c

3. b

4. a

5. b