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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