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Maximum Demand & Diversity Factor As Per National Electrical Code

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The maximum demand is calculated by considering diversity factor of the load.
There are many factors to be considered which calculated maximum demand, however its actual value is considered by knowledge and experience.

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Diversity Factor

Types of load at final circuit	Household installations	Small shop, offices and building premises	Small hotels, boarding houses
Lighting load	66% of the total current demand	75% of the total current demand	85% of the total current demand

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Heating and Power	100 % of total current up to 10 Amp	100% of full load current for largest appliances	100% of full load current for largest appliances
	+ 50% of current if current demand exceed 10 A	+ 75% for remaining appliances	+ 80% for second largest appliances
			+ 60% for remaining appliances

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Cooking Appliances	10 A	100% of full load current of largest appliance	100% of full load current of largest appliance
	+ 30% of full load current in excess of 10 Amp + 6 Amp if socket outlet is also considered	+ 80% of full load of second largest appliance	+ 80% of full load of second largest appliance
		+ 60% of full load of remaining appliances	+ 60% of full load of remaining appliances

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Water Heater	100% of full load current of largest appliance	100% of full load current of largest appliance	100% of full load current of largest appliance
	+ 100% full load current of second largest appliance	+ 100% full load current of second largest appliance	+ 100% full load current of second largest appliance
	+ 25% of full load of remaining appliances	+ 25% of full load of remaining appliances	+ 25% of full load of remaining appliances

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Final arrangement	100% current demand of largest point	100% current demand of largest point	100% current demand of largest point
	+ 40% current demand of every other point	+ 75% of current demand of every other point	+ 75% of current demand of every point in main rooms
			+ 40% of current demand of every other points

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The Estimation of maximum demand is carried out as below. ( only for single tariff )

Connected load	Approximately maximum demand
Lighting load	66% of installed load
Heating appliances	100% of first 10 A
	+ 50% of excess of 10 A

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Connected load	Approximately maximum demand
General socket outlet	100% current demand of largest socket
	+ 40% current demand of other socket
If any cooking appliances	10 A
	+ 30% current demand of remaining connected appliances
	+ 6 A for socket outlet

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