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Clark county department of building sfr main electrical service sub panel calculation worksheet 2025

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The document is a calculation worksheet from the Clark County Department of Building for determining the electrical service requirements for single-family residences (SFR). It outlines the standard calculations based on Article 220 of the National Electrical Code (NEC), including general lighting loads, fixed appliances, dryers, cooking equipment, heating or air conditioning units, and other loads. The worksheet provides a structured approach to calculate the total electrical load and determine the necessary service capacity.

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Click ‘Get Form’ to open it in the editor.
Begin with the General Lighting Load section. Enter the square footage of your space and multiply by 3 VA/ft² to calculate the total load.
For Small Appliance Circuits, input the number of circuits (minimum of 2) and multiply by 1500 VA each.
In the Fixed Appliances section, list all appliances and their respective VA ratings. Ensure you include any applicable demand factors for multiple appliances.
Continue through each section, including Dryer, Cooking Equipment, Heating or A/C, and Largest Motor. Fill in all required fields accurately.
Finally, review your calculations in the Other Loads section and ensure all totals are correctly summed up before submitting.

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How do I calculate what size sub panel I need?

THE 80% Rule This is because circuit breakers can overheat and fail if they are loaded to their full capacity for extended periods of time. For example, if a circuit breaker is rated for 100 amps, it should not be loaded with more than 80 amps of continuous load.

How to calculate a sub panel?

How to Size a Subpanel or Main Lug? For load calculation, multiply continuous loads (lasting 3 or more hours, e.g., water heaters) by 125% per NEC 310-14 and add 100% of non-continuous loads (like light bulbs, TVs).

How to calculate main panel load?

How to Calculate Electrical Load Add together the wattage capacities and ratings of all lighting branch circuits, outlets, and permanent appliances. Subtract 10,000. Multiply by 0.4. Add 10,000. Divide the total by 240.

How to calculate the total electrical load in a building?

To calculate your load, add up the amperage of all your breakers: 30 amps + 20 amps + 15 amps + 50 amps = 115 amps. This means that your total load cannot exceed 115 amps without tripping a breaker. calculating your electrical load is an important step in ensuring the safety and efficiency of your electrical system.

How to electrical load calculation per square foot?

The first step is to measure the total square footage of your home in order to calculate how much electricity is required for all of the lights and normal power outlets. In most cases, the homes square footage will be multiplied by three to calculate the total wattage needed for the lights and outlets.