Home » Electrical Wiring Directory » Electrical Wiring
FAQs » Related » Resources » Reply » Ask a Question
« Why Circuit Breakers Trip Off and What To Do Next Electrical Wiring for Two GFCI Outlets »


How to Plan for a Sub Panel

Planning for an Electric Sub Panel: Identifying Panel Circuits and Connected Loads. Sub Panels are installed and used for several reasons including expanding the circuit breaker capacity of the main electrical panel.


Sub Panels for Expanding Circuit Capacity

Electrical Question: Can I branch out another small panel board from the main panel board just to separate a set of appliances?

  • I’m planning to branch out one of the 30amp circuits in the main panel board.
  • I would like to add a new panel board.
  • The Circuits that will be installed:
    • One 30amp breaker as the main disconnect.
    • Two 20amp breakers for branch circuits.

This electrical question came from: Art, from Kansas City, Missouri.

Dave’s Reply:
Thanks for your electric wiring question Art.

Considerations When Adding a Sub Panel

Application: Adding a Sub Panel.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrical Contractor.
Tools Required: Electricians pouch of hand tools and the various power tools necessary for installing the sub-panel.
Estimated Time: Depends on the type and size of the panel and available access to the project area.
Precaution: Any existing electrical wiring within the immediate area that may interfere with the installation of the sub panel should be identified and turned OFF and Tagged if necessary. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock.
Notice: Installing additional electrical wiring and a sub-panel should be done according to local and national electrical codes with a permit and be inspected.

Identifying Panel Circuits and Connected Loads

  • Sub Panels are installed and used for several purposes including expanding the physical circuit breaker capacity of the main electrical panel.
  • Planning for the sub panel is extremely important for the project to be successful. The potential circuit loads need to be identified.
  • The electrical load capacity of the main electrical panel must be able to support the existing loads and the proposed additional loads.
  • Once the additional circuit loads have been identified then the amperage size of the sub panel may be determined.
  • The size of the sub panel will determine the required size of electrical cable to be installed and the circuit breaker for the feeder circuit.
  • It is best to have a qualified electrical contractor install a sub panel project.
  • Sub panels should be installed by permit and receive the required inspections to ensure the project is installed correctly.

Basic House Wiring Circuits
home-electrical-circuits

  • House Wiring Circuits and Circuit Breakers

  • This article looks at common 120 volt and 240 volt house wiring circuits and the circuit breakers that are installed identifying the types and amperage sizes used in most homes.

Electrical Panel Circuit Listing

Electrical Circuit Breakers
2-pole-circuit-breaker

  • Home Electrical Circuit Breakers

  • A guide to home electrical circuit breakers and how they work to protect your electrical wiring. When properly installed, your home electrical wiring is protected by a circuit protection device.

Home Electrical Wiring Plan

Basic Home Wiring Diagrams


« Welder Circuit 230 Volt Electrical Wiring for Two GFCI Outlets »


Learn How to Wire it Right with my
Complete Guide to Home Electrical Wiring
Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electrical Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
Troubleshooting and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
Electrical Codes for Home Electrical Wiring
....and much more.

» Click here to learn more about Home Electrical Wiring «
  repair electrical wiring  


Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.


Enter a Question or Topic and this Search will Locate Answers for You



Leave a Comment or Question Click here to Ask a Detailed Home Electrical Question and get an Instant Reply.

To Our Valued Visitors:
If you are asking a Quick Question please make sure it is about The SAME TOPIC:
How to Plan for a Sub Panel


Comments Posted here are Open for Quality Discussion and Participation.

PLEASE NOTE: WE DO NOT PUBLISH 3RD PARTY SPAM COMMENTS, TRACK-BACKS OR LINKS.



*