Circuit Wiring for a Sub-Panel

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!
Katie

This Electrical Wiring Question came from: Katie, a Homeowner from Roy, Washington.

Additional Comments: Great resource for a homeowner.

Dave’s Reply:

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.

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

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