Demand-Diversity Factor Value Quick Reference

DEMAND-DIVERSITY FACTOR VALUE QUICK REFERENCE

Diversity Factor (NBC)

Type of Load

Type of Building

Individual House Hold , Individual Dwelling of a Block Small Shops, Stores, Offices & Business Premises Small Hotels, Boarding Houses, etc Lighting 66% of total current demand 90% of total current demand 75% of total current demand Heating and power 100% of total current demand up to 10 A+ 50 % of any current demand in excess of 10 A 100% of full load of largest Appliance + 75% of Remaining appliances 100% of full load of largest appliance+ 80% of second largest appliance + 60% of remaining appliances Cooking appliances 10 A +30 percent full load of connected cooking appliances in excess of 10 A + 6 A if socket-outlet incorporated in the unit 100 % of full load of largest appliance + 80% of full load of second largest appliance + 60% of full load of Remaining appliances 100 % of full load of largest appliance + 80 % of full load of second largest appliance + 60% of full load of Remaining appliances Motors (other than lift motors which are subject to special consideration) 100% of full load of largest Motor + 80% of full load of second largest motor 100 % of full load of largest Motor + 50%of full load of remaining motors Water heater (instantaneous) 100 % of full load of largest Appliance + 100%of full load of second largest appliance + 25 %of full load of remaining appliances 100 % of full load of largest Appliance + 100%of full load of second largest appliance + 25 %of full load of remaining appliances 100 % of full load of largest Appliance + 100%of full load of second largest appliance + 25 %of full load of remaining appliances Water heater (thermostatically controlled) No diversity Standard arrangements of final circuits in accordance with good practice 100 percent of the current demand of the largest circuit + 40 percent of the current demand of every other circuit 100 percent of the current demand of the largest circuit + 50 percent of the current demand of every other circuit Socket outlets other than above and stationary equipment other than those listed above 100% of the current demand of the largest point + 40%of the current demand of every other point 100% of the current demand of the largest point+ 75 % of the current demand of every other point 100%of the current demand of the largest point + 75%of the current demand of every point in main rooms (dining rooms, etc) + 40 % of the current demand of every other point After calculating the electrical load on the above basis, an overall load factor of 70 to 90 percent is to be applied to arrive at the minimum capacity of substation.

Demand Factors (As Per Table 220.42 NEC)

Type of Occupancy Electrical Load Demand Factor Dwelling units First 3000 VA 100% From 3001 to 120,000 VA 35% Remainder over 120,000V A 25% Hospitals First 50,000 VA or less 40% Remainder over 50,000 VA 20% Hotels and motels, including apartment houses without provision for cooking by tenants First 20,000 VA 50% 20,001 VA to 100,000 VA 40% Remainder over 100,000 VA 30% Warehouses storage First 12,500 VA 100% Remainder over 12,500 VA 50% All others Total volt-ampere 100%

Non-dwelling Lighting Loads Demand Factors (As Per 220.44 NEC)

Type of Occupancy Electrical Load Demand Factor Non-dwelling Receptacle Loads First 10KVA 100% Remainder over 10KVA 50%

Diversity (The Electricians Guide 5th Edition by John Whitfield)

Type of final circuit Type of premises Households Small shops, stores, offices Hotels, guest houses Lighting 66% total demand 90% total demand 75% total demand Heating and power 100% up to 10 A + 50% balance 100%X + 75%(Y+Z) 100%X + 80%Y + 60%Z Cookers 10 A + 30% balance + 5 A for socket 100%X + 80%Y + 60%Z 100%X + 80%Y + 60%Z Motors (but not lifts) 100%X + 80%Y + 60%Z 100%X + 50%(Y+Z) Instantaneous water heaters 100%X + 100%Y + 25%Z 100%X + 100%Y + 25%Z 100%X + 100%Y + 25%Z Thermostatic water heaters 100% 100% 100% Floor warming installations 100% 100% 100% Thermal storage heating 100% 100% 100% Standard circuits 100%X + 40%(Y+Z) 100%X + 50%(Y+Z) 100%X + 50%(Y+Z) Sockets and stationary equip. 100%X + 40%(Y+Z) 100%X + 75%(Y+Z) 100%X + 75%Y + 40%Z X = the full load current of the largest appliance or circuit Y = the full load current of the second largest appliance or circuit Z = the full load current of the remaining appliances or circuits

Diversity factor for Building (Horizon Power)

No of customer Diversity factor 1 3 2 2.57 3 2.2 4 2 5 1.89 6 1.8 7 1.74 8 1.71 9 1.69 10 1.64 11 1.61 12 To 14 1.57 15 To 17 1.5 18 To 20 1.46 21 To 23 1.42 24 to 26 1.4 27 To 29 1.38 30 To 59 1.37 ≥60 1

Demand Factor (The Electricians Guide Fifth Edition) by John Whitfield)

Area Demand Factor Office / School 40% Technical Blocks / Hospital 50% Air Port / Banks / Department Store / Shopping Center / Public Place 60% Restaurants / Factories (for 8 Hours Shifts) 70% Workshops / Fac…