Maximum Demand
and Diversity Factor for domestic load as per National Electrical Code is given here.
 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.
Diversity factor
Types of load at
final circuit

House hold
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

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


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


Motor

100% of full load
current of largest appliance

100% of full load
current of largest motor


+ 80% of full load of
second largest appliance

+ 80% of full load of
second largest motor


+ 60% of full load of
remaining appliances

+ 50% of full load of
remaining motors


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


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

 The estimation of maximum demand for domestic installation 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


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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