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Content Overview

File Details

Fact Name Description
Purpose The LADBS NEC Standard Electrical Load Calculation form is used to determine the electrical load requirements for buildings in compliance with the National Electrical Code (NEC).
Applicable Jurisdiction This form is specifically utilized within the City of Los Angeles, California.
NEC Compliance The form ensures that electrical installations meet the standards set forth in the NEC, which is updated periodically.
Load Types It accounts for various load types, including lighting, receptacles, and equipment, to provide a comprehensive load calculation.
Submission Requirement Contractors and electricians must submit this form as part of their permit application for electrical work.
Governing Laws The form is governed by the California Electrical Code, which adopts the NEC with state-specific amendments.
Calculation Method It employs a standardized calculation method to ensure consistency across different projects and installations.
Load Calculation Units The calculations are typically expressed in volt-amperes (VA) to reflect the total electrical load.
Review Process The completed form is reviewed by the Los Angeles Department of Building and Safety (LADBS) for accuracy and compliance.
Record Keeping Once approved, the form is kept on file by LADBS for future reference and inspections.

Sample - LADBS NEC Standard Electrical Load Calculation Form

NEC Standard Electrical Load Calculation for Single Family Dwellings

(Only for Service Ratings of 120/240V, 225 Amps Max)

 

 

Owner:

 

 

 

 

Location:

 

 

 

 

 

 

 

Total Floor Area of Dwelling (NEC 220.12)

 

 

 

 

 

 

 

 

 

SQFT.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factor

 

 

 

 

 

 

 

 

Quantity

 

 

Volt Amperes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(VA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“General Lighting”

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

General Lighting (SQFT X 3 VA/SQ FT (Table 220.12)

3 X

sqft.

 

 

 

2.

Small Appliance Circuits (1500 VA per circuit)

(NEC

1500 X

 

 

 

 

 

220.52(A)) (minimum 2)

 

 

 

 

 

 

 

 

 

 

 

3.

Laundry Circuit (1500 VA per circuit) (NEC 220.52(B))

1500 X

 

 

 

 

4.

Total General Lighting Load (Add lines 1, 2 & 3):

 

 

 

 

 

 

 

 

5.

First 3000 VA @ 100%:

 

 

 

 

 

 

 

 

 

3000

6.

Total General Lighting Load – 3000 =

 

 

@ 35%=

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7.

Net General Lighting Load (Per NEC 220.42) (Add lines 5 & 6):

 

 

 

 

 

 

 

 

 

 

 

 

*Fixed Appliances(if insufficient space, use back):

 

 

YES

NO

 

 

 

Garbage Disposal

 

 

 

 

 

 

 

 

 

 

 

 

 

Bathroom Fan

 

 

 

 

 

 

 

 

 

 

 

 

 

Microwave

 

 

 

 

 

 

 

 

 

 

 

 

 

Dishwasher

 

 

 

 

 

 

 

 

 

 

 

 

 

Other:

 

 

 

 

 

 

 

 

 

 

 

 

 

Other:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total

 

 

 

8.

3 or less Appliances,

Total Appliance VA;

 

 

 

 

 

 

 

 

 

 

 

 

4 or more Appliances,

75% of Total Appliance VA (NEC 220.53):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Other Loads (including motors, EV charger(s), etc.)

 

 

YES

NO

 

Nameplate Rating

 

 

 

(VA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9. Electric

Range (8000VA or Nameplate)**

 

 

 

 

 

 

 

 

 

 

 

10. HVAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.

Electric

Oven

 

 

 

 

 

 

 

 

 

 

 

 

 

12.

Electric

Dryer (5000 VA minimum)**

 

 

 

 

 

 

 

 

 

 

 

13.

Electric

Vehicle Charger

 

 

 

 

 

✔

 

 

 

 

 

14.

Other:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15.

Other:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16.

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)=

*For every “YES” answer, indicate VA rating of equipment

**Nameplate rating must be used if larger

***Service Rating shall be greater than or equal to the Service load

As a covered entity under Title II of the Americans with Disabilities Act, the City of Los Angeles does not discriminate on t he basis of disability and, upon request will provide reasonable accommodation to ensure equal access to its programs, services and activities.

NEC Standard Electrical Load Calculation (Rev. 03-23-2016)

www.ladbs.org

Common mistakes

Filling out the LADBS NEC Standard Electrical Load Calculation form can be a daunting task, especially for those who are not familiar with electrical codes. One common mistake people make is failing to accurately calculate the total load. It's essential to consider all the electrical appliances and devices that will be used in the space. If you overlook even one item, it can lead to an incorrect total load, potentially resulting in safety hazards or code violations.

Another frequent error is neglecting to account for demand factors. The form requires you to apply specific demand factors for different types of loads. Many individuals either skip this step or use incorrect factors, which can skew the calculations. Understanding how to apply these demand factors is crucial for an accurate assessment of the electrical needs.

Additionally, some people misinterpret the requirements for the service entrance capacity. The form asks for the size of the service entrance, but it's easy to confuse this with the load calculations. Ensure that you provide the correct service size that aligns with your total load calculation. This detail is vital for compliance and safety.

Another mistake involves not including future expansion needs. Many individuals focus solely on current electrical needs without considering potential future growth. If you plan to add more appliances or devices later, it's wise to factor in those additional loads now. This foresight can save you time and money down the line.

Inaccurate unit conversions are also a common pitfall. When filling out the form, you may need to convert units, such as from watts to kilowatts. If these conversions are done incorrectly, it can lead to significant errors in your calculations. Double-checking your math can prevent this issue.

Lastly, many people forget to review their completed form before submission. A quick review can catch errors, inconsistencies, or missing information that might otherwise go unnoticed. Taking the time to proofread your work can make a big difference in ensuring your form is accurate and complete.

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