Understanding Electrical Panel Total Amps

Understanding The Total Electrical Load Of An Electrical Panel
Electrical Question: How do I figure total amps in the panel box?

Do I simply add up the amps on the circuit breakers? Is this accurate? I am remodeling the attic over my garage 750 Sq.Ft. and I am hoping to take the power from the sub-panel in the garage. The garage has 2 auto door openers, 6 receptacles and 4 overhead florescent lights. I will be installing 10 receptacles, 10 recessed lights and electric baseboard heat 6-7,000 watts.
Any additional information is appreciated.
Thank you.

This electrical question came from: Stephen, a Handyman from Banner, WY, USA.

Dave’s Reply:
Thanks for your electrical question Stephen.

How to Determine the Total Electrical Load of an Electrical Panel

• Stephen, no – you do not just add up all the amperage ratings of the circuit breakers.
• The total connected load depends on the electrical devices that are actually connected to the circuits and how often these items are being used.
• An electrician will use a clamp-on amp meter to see what the current load may be at any given time, however the best way to see what your highest load has been from your electrical service is to look at your electrical utility bills which will tell you the total usage and peak demand.
• Then simply divide the kilowatts by 240 volts to see what your total usage actually is.
• The load of the circuits that you will be adding can only be determined by understanding what these circuits will be used for.

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Home Electrical Wiring and Electrical Repairs 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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