Installing Electrical Power to a Shop from a Garage
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Installing a Sub Panel to another Electric Panel: I have built a new shop close to my garage and would like to install a over head cable to the garage and for a new panel in the shop. How do I connect to the electrical power in the garage breaker box. |
Wiring a Sub Panel for an Shop or Outbuilding
Electrical Question: I have built a new shop close to my garage and would like to install a over head cable to the garage and for a new panel in the shop. How do I connect to the electrical power in the garage breaker box
- I have a small garage that I ran 100 amp, single phase under ground entrance cable to.
- It comes off the meter base thru a 100 amp breaker to the garage and into a Square D 100 amp breaker box.
- I have just built a new shop within 20′ of this garage and would like to install a over head entrance cable between the garage and the new shop picking up the 100 amp service from the garage taking it to a 100 amp Square D breaker box in the new shop.
- My question is how do I tap into the 100 amp service in the garage breaker box and be within code.
This electrical wiring question came from Mark, in El Reno, Oklahoma.
Dave’s Reply:
Thanks for your electrical wiring question Mark.
Application: Installing a Sub Panel.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor or a Certified Electrician. This is Not Recommended for Homeowners.
Tools Required: Electricians Tools including 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 should be done through the local building authority, installed according to applicable local and national electrical codes, with a permit, and have the required inspections.
Installing a Sub Panel to another Electric Panel
- The New Panel
Connecting a sub panel to an existing panel is typically done by installing a new circuit breaker into the existing panel. The feeder cable to the new panel is then connected to the new circuit breaker. - Panel Wiring
Because the panels are not the main source of electrical service, neutral conductor and ground wire separation must be configured as well. - Main Breaker Disconnect
Keep in mind that the number of circuit breakers that are at each panel will determine if a main breaker will be required as a service disconnect.
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