Trystan Casey
Adding an outdoor electrical outlet is a great way to get power to where you need it, especially for holiday lights. This can be done by attaching an outbox to an electrical panel. Before starting, it is important to carefully plan the job as running cables through walls can be difficult. If your existing electrical box is not large enough to hold more wires, it will need to be replaced. To do this, cut the nails holding the box in place and replace it with a plastic remodeling box. These boxes have wings that attach to the back of the drywall or plaster. When installing an electrical box in a lath-and-plaster wall, take care not to damage the surrounding area. If you are installing an electrical box away from your house, you can use a 4x4 piece of painted wood, vinyl, or painted metal and attach the vertical conduit to the post, setting it in concrete.
| Characteristics | Values |
|---|---|
| Safety | Turn off the power at the circuit breaker before starting work. Use a voltage tester to ensure the power is off. |
| Tools | Non-contact voltage tester, utility knife, drywall saw, screwdriver, flashlight, stud finder, drill, wire stripper, electrical tape |
| Materials | Plastic or metal electrical box, Romex® cable (14-2 or 12-2), wire nuts, screws |
| Box Selection | Choose a box that meets local codes. Plastic boxes are quicker to work with but may not be suitable for heavy fixtures or high-amp circuits. Metal boxes are recommended for larger, 240V outlets. |
| Box Placement | Plan the job carefully, considering the location of studs, pipes, and other fixtures. Maintain uniformity in box height and placement. |
| Wiring | Strip 8 inches of the outer jacket from the cable. Feed the cable into the box, leaving about 1 inch inside. Splice wires to the receptacle and secure with screws. |
| Testing | Use a receptacle tester to ensure the outlet is wired correctly. |
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What You'll Learn
Choosing the right electrical box
The box you need depends on the wiring installation. Electricians use far more plastic boxes because they are less expensive, and because they are non-conductive, they are quicker to install. Plastic boxes are the most common choice for residential wiring projects. They are lightweight, easy to install, and less expensive than metal options. They are also compatible with non-metallic cable wiring.
Metal boxes are required in some situations and have some unique benefits. Metal boxes are sturdy and available in more sizes than plastic boxes. Some metal boxes can be interlocked for larger capacity.
New work boxes are used in new construction or when walls are opened up for renovations. They are designed to be installed before drywall or other wall coverings are in place. Old work boxes, or retrofit boxes, are used in existing walls where access is limited. These boxes allow you to add new electrical devices without affecting your drywall.
Multi-gang boxes are best for situations where you need multiple devices in a single location. They range from three-gang to six-gang boxes, providing space for switches, receptacles, dimmers, or combination outlets.
Standard rectangular boxes, or single-gang boxes, are used for single light fixture switches and outlet receptacles. They are generally about 2 inches wide by 4 inches tall, and their depths range from 1-1/2 inches to 3-1/2 inches. Round pan or pancake boxes are shallow circular boxes most commonly used for ceiling- or wall-mounted light fixtures that weigh no more than 50 pounds.
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Preparing the electrical panel
Choose the Right Electrical Box
Select an appropriate electrical box that suits your specific needs. You can choose between metal and plastic boxes, each with its advantages and disadvantages. Plastic boxes are recommended as they are safer and easier to work with, while most metal boxes are too small to accommodate additional wires.
Check the Size and Capacity
Ensure that your electrical box is large enough to hold all the wires safely. An overstuffed box poses a fire hazard. Check the volume listing, typically found inside a plastic box, to determine if it can accommodate the required number of wires. If your existing box is too small, consider replacing it with a larger one.
Plan the Cable Route
Before installing the electrical box, carefully plan the route for running the cable through the walls. This step is crucial as it can be challenging to run cables through walls covered with drywall or plaster. Consider using a stud sensor to determine the location of studs and plan the cable route accordingly.
Prepare the Wall
When installing the electrical box in a wall, take your time to cut through the lath-and-plaster carefully. It is easy to damage the surrounding area, so work meticulously. Cut through the plaster with a knife and then use side cutters or a jigsaw to cut through the metal lath. Drill starter holes at each corner to facilitate a neat cut.
Mounting Options
If your electrical box is not mounted near your house, you'll need to consider alternative mounting options. You can use a standard 4"x4" wooden post, vinyl, or painted metal, ensuring it is firmly secured to the ground with concrete. Alternatively, you can use a pre-made outdoor electric box post, but these can be difficult to find and may be overpriced.
Running the Cable
When running the cable from the house to the outdoor electrical panel, ensure it exits the house through a weather-protected hole. Consider using PVC for the hole to protect the wires from the elements. If you are running wires through an exterior wall, inspect the path for any sharp metal edges that could damage the cable.
Remember, safety should be your top priority when working with electrical installations. Always turn off the power before beginning any work, and if you are unsure about any aspect of the project, consult a qualified electrician.
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Attaching the electrical box
Attaching an electrical box to an existing wall is a simple process, but it requires careful planning. Firstly, choose an interior outlet to use. Building codes prohibit tapping into circuits in certain areas, such as the kitchen, bathroom, or laundry room. Once you've chosen a suitable outlet, decide on the placement of the new outlet. If you want to keep the project simple, place the new outlet in the same stud cavity as the existing indoor outlet.
If your existing electrical box is not large enough to hold more wires, you will need to replace it. Start by removing the old box, then cut a larger opening for the new box. Cut the nails holding the old box in place and remove it. Replace it with a plastic "remodeling" box, which has wings that flip up and attach to the back of the drywall or plaster. Hold the new box over the wall opening and trace around it, then enlarge the opening with a drywall saw. Ensure you don't overcut; you want a snug fit.
Now, feed the new cable from the outlet being added into the box. Wrap the cable with electrical tape where the sheathing meets the exposed wires, allowing the sheathing to slide into the box more easily. Unscrew and pull the receptacle out of the electrical box, then double-check that the power is off by holding a voltage tester over the terminals. Unscrew the wires from the outlet, and ensure the junction box is large enough to hold an added set of wires. Use a stud sensor to determine which side of the electrical box the stud is on.
Finally, attach the cover to the base. Push the hinge receptacles sideways over the hinges until they snap into place. Remove the cord knockouts in the base where the electrical cords will run, then turn on the power.
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Connecting the wires
Connecting wires to an electrical panel is a complex process that requires careful planning and execution. Here is a step-by-step guide to help you through the process:
Firstly, ensure that the power is turned off at the main breaker. Safety should always be the top priority when working with electrical systems. Use a voltage tester to double-check that the power is indeed off.
Next, you need to choose the correct type of electrical box for your specific needs. There are two main types of electrical boxes: metal and plastic. Metal boxes are typically too small to hold additional wires, so it is recommended to replace them with plastic "remodeling" boxes. These plastic boxes are ideal for this project as they have wings that flip up and attach to the backside of the drywall or plaster, providing a secure fit.
Now, carefully cut a large enough opening in the wall for the new box. This step requires precision, as you want to ensure a snug fit. Cut the nails holding the old box in place and remove it. Before installing the new box, feed the new cable from the outlet being added into the box. Wrap the cable with electrical tape where the sheathing meets the exposed wires to allow the sheathing to slide into the box more easily.
Once the new box is in place, you can start connecting the wires. Unscrew the wires from the outlet and attach them to the new box. Ensure that the junction box is large enough to accommodate the added set of wires, as an overstuffed box poses a fire hazard.
Finally, secure the box firmly in place. For drywall or plaster walls, use screws to attach the box. Tighten the screws until you feel resistance, and the box is firmly attached.
If your electrical box is not near your house, you will need to get creative with how you mount it. One option is to use a standard 4"x4" wooden post, painted to match the box or the surrounding environment. Attach the box to the post, and then bury the post in concrete to create a permanent installation.
Connecting wires to an electrical panel is a detailed process that requires careful consideration at each step. Always prioritize safety and ensure that you are confident in your abilities before attempting any electrical work.
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Testing and safety checks
Planning and Preparation:
Before beginning any work, it is essential to have the proper tools and safety equipment. Put on protective gear, including eye protection, gloves, and grounding straps. Ensure you have the necessary tools, such as a voltage tester, multimeter, receptacle tester, and appropriate wiring. Identify the power source by locating the circuit breaker panel box. Turn off the power at the circuit breaker to prevent electrical injuries.
Voltage Testing:
Use a non-contact voltage tester to verify that the power is off at the outlet. This step is crucial for safety, as it ensures you are not working with live wires. Hold the voltage tester over the terminals to confirm that no voltage is present.
Wiring Inspection:
Inspect the wiring for any signs of damage, such as cracks, splits, or rodent activity. Ensure that the wiring is intact and free from any obstructions or corrosion. Verify that the wiring is connected securely and correctly, following the proper color-coding and terminal connections.
Receptacle Testing:
Once the wiring is complete, use a receptacle tester to check if the outlet is wired correctly. Plug the receptacle tester into the outlet and observe the indicators. These indicators will alert you to any wiring issues, such as missing ground connections, reversed wires, or open hot connections.
Grounding Check:
Grounding is essential for electrical safety. Verify that the outlet is properly grounded to ensure a safe path for excess electrical energy to dissipate. An improperly grounded outlet can pose a risk of electrical shock or fire.
Final Inspection:
Ensure that the outlet box is securely attached to the wall and is flush with the surface. Check that the outlet is at the correct height, typically at least 15 inches above the floor. Inspect the cable sheathing and confirm that it extends at least 1/4 inch into the box, allowing the cable clamps to grip the sheathing securely. Verify that there is at least 8 inches of usable wire length extending from the box for future connections.
Safety Precautions:
Always be mindful of your surroundings and maintain a safe distance from electrical components. Do not touch any electrical equipment if you are standing on a wet surface or if there is condensation present. If you notice any signs of overheating, melting, or burning inside the electrical panel, discontinue the work and address the issue.
Remember, dealing with electrical panels and outlets requires expertise and a strong understanding of electrical safety. If you are unsure or uncomfortable at any point, it is best to consult a licensed electrician to ensure the work is completed safely and correctly.
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