Circuit Wiring for a Sub-Panel
April 26, 2014 by: Dave Rongey
How to Install a Sub-Panel: Wiring for a Sub-Panel, Necessary Planning When Installing an Electrical Sub-Panel and the main feeder cable.
Installing a Sub-Panel
Electrical Question: I am installing a sub panel and have questions about the main wire connections.
- Can I connect the sub-panel wires by the Main lugs, or do I need to go into a breaker first.
- Am I required to have only one separate ground rod?
- I am planning on getting this inspected also.
Thanks for your time!
This Electrical Wiring Question came from: Katie, a Homeowner from Roy, Washington.
Additional Comments: Great resource for a homeowner.
Thanks for your electrical wiring question Katie.
How to Install a Sub-Panel
Application: Wiring a Sub Panel
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor, Danger of Arc Flash.
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.
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.
Installing a Electrical Sub-Panel and Planning the Circuits
- Installing a sub-panel is something that requires careful consideration and understanding in order for the project to be done safely and according to a list of applicable electrical codes, this is why I recommend that homeowners consult a qualified licensed electrical contractor to assist with a project of this nature.
- The main feeder cable wiring must be selected and sized properly and connected to a separate circuit breaker in the panel that is supplying the power to the sub-panel.
- There are several factors that must be considered when sizing and installing a sub-panel and a qualified electrician will be extremely helpful to identify these with you.
More about Wiring a Sub-Panel
Electrical Wiring Codes
Home Electrical Codes
- 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-codes and smoke-detectors.
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
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.
Basic Home Wiring Diagrams
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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