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The LADBS NEC Standard Electrical Load Calculation is a form used for single-family dwellings to calculate the standard electrical load based on guidelines from the National Electrical Code (NEC). Designed for service ratings of 120/240V and up to 225 Amps, the form facilitates the documentation of various electrical loads within a residence, including general lighting, appliance, and motor loads.
This form includes sections for calculating general lighting load based on the floor area, fixed appliances like garbage disposals and microwaves, heating, ventilation, air conditioning (HVAC) systems, and additional electrical equipment such as electric vehicle chargers. Filling this form ensures electrical systems are adequately sized and conform to safety standards, helping homeowners and inspectors maintain electrical safety and efficiency.
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What it is: NEC Standard Electrical Load Calculation for Single Family Dwellings, only for service ratings of 120/240V, 225 Amps Max.
Enter the Owner and the Location.
Enter the Total Floor Area of Dwelling (NEC 220.12) in SQFT.
Under Factor, on line 1, General Lighting, enter the sqft as the Quantity and SQFT X 3 VA/SQ FT (Table 220.12) as the Volt Amperes (VA).
On line 2, Small Appliance Circuits, enter 1500 VA per circuit (NEC 220.52(A)), minimum 2.
On line 3, Laundry Circuit, enter 1500 VA per circuit (NEC 220.52(B)).
On line 4, Total General Lighting Load, add lines 1, 2 & 3.
On line 5, the First 3000 VA @ 100% is 3000.
On line 6, enter the Total General Lighting Load - 3000 = and then @ 35%=.
On line 7, the Net General Lighting Load (Per NEC 220.42), add lines 5 & 6.
Under Fixed Appliances (if insufficient space, use back), mark YES or NO for Garbage Disposal, Bathroom Fan, Microwave, Dishwasher and Other.
For every "YES" answer, indicate VA rating of equipment.
On line 8, with 3 or less Appliances enter the Total Appliance VA; with 4 or more Appliances, enter 75% of Total Appliance VA (NEC 220.53).
Under Other Loads (including motors, EV charger(s), etc.), mark YES or NO and enter the Nameplate Rating (VA) for 9. Electric Range, 10. HVAC, 11. Electric Oven, 12. Electric Dryer, 13. Electric Vehicle Charger, 14. Other and 15. Other.
For 9. Electric Range (8000VA or Nameplate) and 12. Electric Dryer (5000 VA minimum), nameplate rating must be used if larger.
On line 16, enter 25% of largest motor (NEC 430.24).
Total Service Load Volt-Amperes (VA): add lines 7, 8 & 9 thru 16. Total Service Load Volt-Amperes / 240-volts = Amperes.
Service Rating (Amperes) shall be greater than or equal to the Service load.
NEC Standard Electrical Load Calculation for Single Family Dwellings, only for service ratings of 120/240V, 225 Amps Max.
[1] NEC Standard Electrical Load Calculation (Rev. 03-23-2016), City of Los Angeles Department of Building and Safety (the Official source link on this page).