Molly Ayala
Installing an electrical subpanel is a complex process that requires careful planning and execution to ensure safety and functionality. Before beginning any work, it is crucial to consult a licensed inspector to confirm that your electrical system can handle the addition of a subpanel and to obtain any necessary permits. The process involves mounting the subpanel near the main service panel, planning the routes for wires, connecting the wires to the appropriate terminals, and ensuring that the grounded neutral conductor and equipment grounding conductors are not bonded together to prevent shock and fire hazards. Proper wire management is essential, and the use of used panels or cables should be avoided to mitigate the risk of electrical issues and potential fires.
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What You'll Learn
Planning and safety
When choosing a location for your subpanel, avoid areas like bathrooms or closets where steam, humidity, or lack of ventilation could cause the subpanel to short out or overheat. The subpanel must be easily accessible, and you should mount it at least 78 inches above the floor, ensuring it's out of reach of children and pets.
Before beginning any installation work, shut off the main breaker in the service panel to cut the power supply. This critical safety measure will protect you from accidental shocks or electrocution.
When installing the subpanel, ensure the grounded neutral conductor and equipment grounding conductors (EGCs) are not bonded together. Failing to separate these pathways is dangerous, as it can lead to fatal shocks. Therefore, remove the green bonding screw or metal bonding strap to ensure these pathways remain separate.
Finally, be cautious when purchasing materials. Avoid used panels or cables, as they could damage your electrical system and cause a fire. Instead, opt for new, high-quality components to ensure the safety and longevity of your electrical subpanel.
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Purchasing the right equipment
You can find subpanels and attachments at hardware stores. A standard setup includes a subpanel, a 4-wire feeder cable, a feeder breaker, and connectors. The subpanel should have all the necessary connections. It is important to avoid purchasing used panels or cables, as this could damage your electrical system and potentially cause a fire.
The feeder cable will carry electricity from the main panel to the subpanel. It typically consists of three wires: a black wire, a red wire, and a white wire. The black and red wires are "hot" wires, carrying the electrical current. The white wire is the neutral wire, and it completes the circuit by providing a return path for the current. Additionally, there should be a green grounding wire, which is essential for safety.
When selecting a feeder cable, the breaker rating will determine the gauge of the wire. You can use either copper or aluminium feeder wire, depending on the installation. Copper is generally considered a better conductor and is more flexible, making it easier to work with. However, aluminium is a more economical option and is suitable for installations where the conductor length is longer.
Lastly, consider the placement of your subpanel. It should be installed near the main panel, typically about a foot away, to extend your circuitry and power additional electrical devices. The subpanel must be easily accessible but out of reach of children and pets. It should be placed at a height of about 5 feet, and the top of the subpanel should be at least 78 inches above the floor.
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Preparing the main panel
Once the power is off, locate the main service panel. This is where the power provided by the electric utility company or generated by solar panels or wind turbines branches out to all the devices in your house. The main panel will have a feeder breaker that acts as the main disconnect for the subpanel. Consult with a licensed inspector to ensure that your system can handle the addition of a subpanel and that you do not overload your overall system. The inspector can advise on the amperage your subpanel should be and ensure you are adhering to local building codes.
At the main service panel, plan the routes for the four wires: ground, neutral, and two hot wires (black and red). The subpanel feeder breaker in the main service panel serves as the disconnect for a subpanel in the same building. If your subpanel is in a detached building, you will need a main breaker. In the main service panel, the grounded neutral conductor and the equipment grounding conductors (EGCs) are bonded together, but they must not be bonded together in a subpanel to avoid creating a shock and fire hazard.
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Installing the subpanel
Installing a subpanel can be a complex process, and mistakes can be dangerous. Before you begin, consult a licensed inspector to ensure you do not overload your system and that your setup is safe. The inspector can also advise on amperage and check that your setup complies with local building codes.
Once you have the go-ahead, turn off the power to the main panel to avoid any risk of electrocution. You will need to purchase a subpanel, 4-wire feeder cable, feeder breaker, and connectors. Place the subpanel about a foot away from the main panel, ensuring it is not installed in a bathroom or closet, where it could be exposed to water or overheating. Mark the location of the mounting screws, placing the subpanel about 5 feet from the ground, so it is easily accessible but out of reach of children and pets. Drill the mounting screws into the stud, leaving a 1/4-inch gap.
Now, you can begin to wire the subpanel. Plan the routes for the four wires: ground, neutral, and two hot wires (black and red). Remove a knockout slug, slide the wires through, and clamp the cable. Route, cut, and strip the red and black wires, connecting them to the feeder breaker, and snap the breaker into place. In the subpanel, route the feeder wires, cut and strip them, and connect them to the terminals. Connect the black and red wires to the hot bus bars, the neutral wire to the main neutral terminal, and the ground wire to the ground bus bar.
Finally, run cable for new circuits into the subpanel and clamp the cable. For each circuit, route wires around the perimeter, connect the ground wire to the ground bus bar, the white wire to the neutral bus bar, and the hot wire to a circuit breaker.
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Connecting the wires
The subpanel connects to the main service panel with a thick three-wire cable. At the main service panel, plan the routes for the four wires: ground, neutral, and two hot wires (black and red). The black and red wires are the hot wires, the neutral wire is white, and the ground wire is green. The feeder breaker in the main panel acts as the main disconnect for the subpanel.
In the subpanel, route the feeder wires, cut and strip them, and connect them to the terminals. Connect the black and red wires to the hot bus bars, the neutral wire to the main neutral terminal, and the ground wire to the ground bus bar. Ensure that the ground and neutral pathways remain separated downstream from the building's main service panel, as bonding them creates a shock and fire hazard.
Finally, run cable for new circuits into the subpanel and clamp the cable. For each circuit, route wires around the perimeter, connect the ground wire to the ground bus bar, the white wire to the neutral bus bar, and the hot wire to a circuit breaker.
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Frequently asked questions
Consult with a licensed inspector to ensure that you do not overload your electrical system and to confirm that it is safe to install a subpanel. You may also need to check local building codes to see if you need to submit any special paperwork or acquire a permit.
Place the subpanel about a foot away from your main panel. The top of the subpanel must be at least 78 inches above the floor. Do not install subpanels in a bathroom or closet.
You will need a subpanel, 4-wire feeder cable, feeder breaker, and connectors.
Before you begin, shut off the main breaker in the service panel. You should also mark the location of the screws on the wall and drill them into a stud leaving a 1/4-inch gap.
