Calculating the Circuit Size for Lights and Ceiling Fans

How to Determine the Circuit Size for a Lighting by Calculating the Total Electrical Load…

© By: Dave Rongey

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Calculating the Circuit Size for Lighting
[ad#block]Electrical Question: I want to put 2 to 3 68 watt fluorescent ceiling lights, 1 ceiling fan rated at 39 watts and 1 duplex wall outlet on a 20amp circuit. I can do away with one fluorescent light and the wall outlet if needed.

This electrical question came from: Neil, from Rogersville, Tennessee

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Dave’s Reply:
Thanks for your electrical question Neil

Electrical Lighting Circuits

How to Determine the Circuit Size for Lighting Based on Watts

Neil, you are on the right track to determine the wire size of the electrical circuit. Adding up the total number of watts is the best way to see what the actual load will be.
There are typically two circuit sizes that can be used for home lighting:
- 15 amps, 120 volts which has the rated capacity of 1800 watts.
- 20 amps, 120 volts which has the rated capacity of 2400 watts.
- These calculations are based on 100% power factor.
- Keep in mind that an electrical circuit should be loaded to 80% of the rated capacity.

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A Complete Guide to Home Electrical Wiring

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Includes:
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Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

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Please Note:
Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects:

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.

Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.

Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.

Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.

Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.

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