What Size Main Disconnect Breaker in a Sub Panel
Can I use a 100amp main breaker in a 50amp sub panel? Options for a Main Disconnect Breaker in a Sub Panel.
Main Breaker for a Sub Panel
Electrical Question: Can I use a 100amp main breaker in a 50amp sub panel?
Wiring a Sub Panel
If I choose to use a panel that has a breaker factory installed which you can not change because I would like a disconnect in my sub panel and the breaker in that panel is 100 amps the lowest you can buy, can I use this breaker if I install a 50 amp sub panel with the proper feed wire for a 50 amp sub panel? I am told that this breaker would be the means of disconnect only.
Additional Comments: Great site
Thanks for your electrical wiring question Bruce.
Main Disconnect Breaker for a Sub Panel
Application: Installing a Sub Panel.
Skill Level: Advanced – Best performed by a Licensed Electrical Contractor, or Certified Electrician.
Electrical Tools Required: Basic Electricians Pouch Hand Tools, Voltage Tester, and appropriate Safety Gear.
Estimated Time: Depends on the personal level experience, ability to work with tools, install electrical circuit wiring, and the available access to the project area.
Electrical Safety: Identify the electrical power source to the Sub Panel, turn it OFF and Tag with a Note before working with the electrical wiring.
Electrical Wiring Parts and Materials: Electrical parts and materials for the Sub Panel should be approved for the specific project and compliant with local and national electrical codes.
Electrical Codes and Inspections: Installing or changing home electrical wiring should be done according to local and national electrical codes as adopted in your specific area. A permit and inspections may also be required.
Installing a Sub Panel in a Basement
This electrical wiring project is about Residential Electrical Code a Sub Panel in the Basement of a Old Home.
Options for a Main Disconnect Breaker in a Sub Panel
- Bruce, from the information you have provided, a 50amp rated cable feed must be protected by a 50amp circuit breaker at the panel that is the source of power.
- I personally have never used a circuit breaker in a sub panel that is rated at a higher amperage than the amperage rating of the cable feed to the sub panel.
- In many cases, the factory installed circuit breaker may be replaced with a breaker that has a lower amperage rating, however if this is not possible, then a sub panel may be installed that does not have a factor installed main breaker, and a 2pole breaker with the correct amperage rating for the supply cable may be installed and labeled as the main breaker, which in turn will then be the main disconnect for the sub panel.
More about a Residential Electrical Sub Panel
Sub-Panel Electrical Wiring for the Home
Electrical sub-panel wiring considerations for the home complete with pictures. Careful planning for your Sub-Panel with immediate and future load considerations will help you understand how to size your Sub-Panel. This information will help as you consider a Sub-Panel and its size.
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.
Basement Electrical Wiring
Fully Explained Photos and Wiring Diagrams for Basement Electrical Wiring with Code Requirements for most new or remodel projects.
Electrical Code Articles for Home Wiring
Electrical Code Directory covering AFCI circuit, electrical-boxes, electrical-circuit, electrical-code-outlets, electrical GFCI, electrical-grounding, electrical-project, electrical-services, electrical-underground, electrical-wiring, electrical-wiring-code, lighting-code, and smoke-detectors.
The following may also be helpful for you:
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wires!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
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