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NEC Standard Electrical Load Calculation for Single Family Dwellings
(Only for Service Ratings of 120/240V, 225 Amps Max)
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Owner: |
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Location: |
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Total Floor Area of Dwelling (NEC 220.12) |
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SQFT. |
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Factor |
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Quantity |
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Volt Amperes |
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(VA) |
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“General Lighting” |
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1. |
General Lighting (SQFT X 3 VA/SQ FT (Table 220.12) |
3 X |
sqft. |
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2. |
Small Appliance Circuits (1500 VA per circuit) |
(NEC |
1500 X |
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220.52(A)) (minimum 2) |
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3. |
Laundry Circuit (1500 VA per circuit) (NEC 220.52(B)) |
1500 X |
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4. |
Total General Lighting Load (Add lines 1, 2 & 3): |
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5. |
First 3000 VA @ 100%: |
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3000 |
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6. |
Total General Lighting Load – 3000 = |
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@ 35%= |
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7. |
Net General Lighting Load (Per NEC 220.42) (Add lines 5 & 6): |
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*Fixed Appliances(if insufficient space, use back): |
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YES |
NO |
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Garbage Disposal |
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Bathroom Fan |
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Microwave |
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Dishwasher |
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Other: |
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Other: |
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Total |
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8. |
3 or less Appliances, |
Total Appliance VA; |
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4 or more Appliances, |
75% of Total Appliance VA (NEC 220.53): |
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*Other Loads (including motors, EV charger(s), etc.) |
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YES |
NO |
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Nameplate Rating |
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(VA) |
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9. Electric |
Range (8000VA or Nameplate)** |
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10. HVAC |
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11. |
Electric |
Oven |
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12. |
Electric |
Dryer (5000 VA minimum)** |
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13. |
Electric |
Vehicle Charger |
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✔ |
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14. |
Other: |
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15. |
Other: |
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16. |
25% of largest motor (NEC 430.24) |
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Total Service Load |
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Total Service Load |
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Amperes |
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***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. |
www.ladbs.org |
Document Information
| Fact Name | Description |
|---|---|
| Purpose | The LADBS NEC Standard Electrical Load Calculation form is used to determine the electrical load requirements for a building or structure. |
| Compliance | This form ensures compliance with the National Electrical Code (NEC) and local regulations in Los Angeles. |
| Required Information | Users must provide details such as the type of occupancy, square footage, and number of electrical devices. |
| Load Types | The form calculates various load types, including lighting, receptacle, and appliance loads. |
| Submission | The completed form must be submitted to the Los Angeles Department of Building and Safety (LADBS) for review. |
| Governing Laws | The form adheres to California state laws and local amendments to the NEC. |
| Calculation Method | Load calculations can be performed using both manual methods and software tools approved by LADBS. |
| Review Process | After submission, LADBS reviews the calculations to ensure they meet safety and regulatory standards. |
| Revisions | If discrepancies are found, applicants may need to revise and resubmit the form. |
| Importance | Accurate load calculations are critical for ensuring the safety and efficiency of electrical systems in buildings. |
LADBS NEC Standard Electrical Load Calculation - Usage Guidelines
Completing the LADBS NEC Standard Electrical Load Calculation form is a crucial step in ensuring that your electrical installation meets safety and performance standards. Properly filling out this form helps in assessing the electrical load requirements for a project, ensuring compliance with local regulations. Below are the steps to guide you through the process of completing the form accurately.
- Begin by gathering all necessary information about the project, including the type of occupancy, square footage, and any specific electrical appliances or systems that will be installed.
- Locate the section of the form that requires the address of the project site. Fill in the complete address, including city, state, and zip code.
- Identify the type of occupancy for your project. This may include residential, commercial, or industrial. Select the appropriate option on the form.
- Calculate the total square footage of the area that will be serviced by the electrical system. Record this number in the designated space on the form.
- List all major electrical appliances and systems that will be used in the project. This includes heating and cooling systems, lighting, and any other significant electrical loads.
- Refer to the NEC (National Electrical Code) guidelines to determine the load calculations for each appliance or system listed. Use the appropriate formulas to calculate the total load.
- Sum all calculated loads to arrive at the total electrical load for the project. Enter this total in the specified section of the form.
- Review all entries for accuracy. Ensure that all calculations are correct and that all required fields are filled out completely.
- Once verified, sign and date the form in the designated area to certify that the information provided is accurate to the best of your knowledge.
- Submit the completed form to the appropriate local authority or agency as per the submission guidelines provided.
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Dos and Don'ts
When filling out the LADBS NEC Standard Electrical Load Calculation form, attention to detail is crucial. Here are some guidelines to help ensure accurate completion:
- Do read the instructions carefully before starting. Understanding the requirements will help prevent mistakes.
- Do provide accurate measurements and calculations. Double-check your figures to ensure they reflect the actual load requirements.
- Do use clear and legible handwriting or type your responses. This will help avoid confusion during the review process.
- Do submit the form on time. Late submissions can lead to delays in processing your application.
- Don't leave any sections blank. Every part of the form must be completed to avoid unnecessary delays.
- Don't use outdated information. Ensure that all data reflects the current electrical codes and standards.
- Don't guess on calculations. If unsure, consult with a qualified professional to obtain accurate figures.
- Don't forget to sign and date the form. An unsigned form may be rejected, causing delays in your project.
Common mistakes
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Inaccurate Load Estimates: Many people underestimate or overestimate the electrical load required for their project. This can lead to insufficient power supply or excessive costs. It's essential to calculate the load based on actual needs, considering all appliances and equipment.
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Neglecting Future Expansion: Some individuals forget to account for future growth. If you plan to add more appliances or expand your space later, it’s wise to include this in your calculations now. This foresight can save you from costly upgrades down the line.
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Ignoring Local Codes: Each area has specific electrical codes and regulations. Failing to adhere to these can result in delays or rejections. Always check local requirements to ensure your calculations meet the necessary standards.
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Incomplete Information: Leaving out details or not providing all necessary data can lead to errors. Ensure that every section of the form is filled out completely. Double-check for accuracy before submission to avoid complications.