Ethan Clarke
Wiring a plastic electrical box is a process that requires careful attention to safety and detail. It involves a series of steps, from ensuring the power is off at the electrical outlet to feeding new wiring through the box and making careful considerations for cable entry and clamping. Plastic electrical boxes differ from metal boxes in their clamping mechanisms and cable entry methods, and it is important to be aware of these differences when working with plastic electrical boxes. With the right tools and precautions, installing a plastic electrical box can be a straightforward process, but it is always important to prioritize safety when working with electrical systems.
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What You'll Learn
Plastic boxes have knockouts that provide a cable entry
Plastic electrical boxes are different from older-style metal boxes, which feature a clamping mechanism that secures or anchors the cable to the box. Plastic boxes, on the other hand, have knockouts that provide a cable entry. This knockout creates a hole through which the cable passes, and the cable is then held in place by a staple or wire clamp within 8 inches of the electrical box, as per electrical code requirements. This setup allows the cable to float freely within the box, and some people even create a flap or door by breaking three sides of the plastic, providing additional cable retention.
When working with plastic electrical boxes, it is important to note that metal-clad cables should not be used. Instead, non-metallic (NM) or Romex cables are more suitable. The plastic boxes are designed with built-in clamps to secure the NM cable in place. It is also worth mentioning that some plastic boxes might have prepunched holes, which can be advantageous for air sealing.
To install wiring in a plastic electrical box, it is crucial to follow safety precautions. Ensure that the power is turned off at the circuit breaker panel box before beginning any work. Use a voltage tester to confirm that the power is indeed off at the electrical outlet you will be working with. Once confirmed, unscrew the faceplate and remove the outlet from the box. Create a hole in the back of the old box using a screwdriver, targeting one of the knockouts usually found in the corners.
Feed your new wiring through the hole you created, and out the other side of the wall. The friction fit of the knockout will hold the wires in place. Remember to leave about 1/4 inch of insulation beyond the cable clamp or friction point to protect the wires inside the cable. Additionally, ensure you have at least 6 inches of conductor from where the cable enters the box for the makeup of the receptacle. Finally, connect the new wiring to the outlet, and you can enjoy your newly installed outlet.
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Metal boxes have a clamping mechanism to secure cables
Metal electrical boxes differ from plastic ones in that they feature a clamping mechanism that secures cables to the box. This is absent in plastic boxes, which instead have knockouts that provide entry for cables. The cable in a plastic box is not clamped and instead floats freely in the hole created by the knockout. It is then held in place by a staple or wire clamp, which must be placed within 8 inches of the electrical box, according to electrical code.
The clamping mechanism in metal boxes sits over the NM (Romex) cables where they enter the box. This arrangement acts as an anchor, securing the cable to the box. In contrast, plastic boxes rely on the staple or wire clamp to hold the cable in place, ensuring it doesn't move when plugging or unplugging a cord.
When working with metal boxes, it's important to note that they should not be used with metal-clad cables. This is a crucial safety consideration to keep in mind when choosing the type of box and cable to use for your electrical installation.
While metal boxes offer the advantage of a built-in clamping mechanism, plastic boxes have their own benefits. For example, the brown plastic boxes are more rigid and do not have any pre-punched holes, making them better for air sealing. Additionally, they are easier to drill if you want to use round metal clamps or if you prefer to come in at an alternate angle for your installation.
Overall, the clamping mechanism in metal boxes provides a secure connection for cables, while plastic boxes rely on knockouts and external staples or wire clamps to hold cables in place. Each type of box has its own unique characteristics and considerations, and it's important to follow electrical safety guidelines and choose the appropriate materials for your specific installation needs.
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Use a voltage tester to ensure the power is off
When working with electricity, safety is paramount. Before you begin installing a plastic electrical box, it is crucial to ensure that the power is off. This step cannot be overstated, as failing to do so could result in serious electrical shocks or accidents.
To guarantee the power is indeed off, you should use a voltage tester. Voltage testers, including non-contact voltage testers or voltage tester pens, are essential tools that can help you ascertain if the electrical current is active. These testers are widely available and provide an added layer of safety when tackling electrical work.
To begin, locate the electrical outlet from which you will be drawing power. Use the voltage tester to double-check that the power is off at this outlet. This step is critical and should not be skipped or rushed. Take your time to ensure that the power is indeed off before proceeding.
Once you have confirmed that the power is off, you can carefully unscrew the faceplate from the old outlet and gently pull it away from the box. This will expose the wiring and inner components, allowing you to begin the process of installing your plastic electrical box.
Always remember to prioritize safety when working with electricity. Taking the time to double-check that the power is off with a voltage tester is a simple yet effective way to protect yourself and ensure a smooth and accident-free installation process.
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Mark the area to cut with a utility knife
Marking the area to cut with a utility knife is a crucial step in installing a plastic electrical box. Here's a detailed guide on how to approach this step effectively:
First, ensure you have the necessary tools, including a utility knife and a stud finder. The stud finder will help you avoid installing the box next to a stud or pipe. Place the plastic electrical box against the drywall where you plan to install it. It's important to ensure that the box is level; use a torpedo level held against the box to confirm this.
Once you're satisfied with the placement, trace around the box with a pencil, creating an outline on the drywall. This outline marks the area you will cut. Now, you can use the utility knife to score the drywall paper along the pencil outline. Be careful and deliberate in this step to avoid cutting too deeply into the drywall or, worse, accidentally cutting any wires behind it.
The scoring creates a clear guide for the next step, which involves using a drywall or jab saw to carefully cut out the hole for the box. This process requires patience, as you should cut slowly and carefully to avoid any mistakes. By taking your time and following these steps, you'll be able to safely and accurately mark and cut the area for your plastic electrical box installation.
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Use wire strippers to strip insulation off wire ends
When installing a remodelling box, also called an old-work box, safety is paramount. Before you begin, ensure that the power is off at the electrical outlet you will be working on. Once you've fed the new wiring through the hole and out the other side of the wall, it's time to use wire strippers to strip the insulation off the wire ends.
First, you need to understand how much insulation to strip. As a general rule, you should strip enough insulation to leave about 1/4 inch of insulation beyond the cable clamp or friction point. This protects the wires inside the cable from potential damage. For the conductor, you must leave at least 6 inches from where it enters the box for the makeup of the receptacle.
Now, take your wire strippers and locate the notch that corresponds to the gauge of your wire. Place the notch of the wire strippers onto the wire at the appropriate point, as measured earlier. Close the jaws of the wire strippers around the wire and give them a firm squeeze. You should feel the blades cutting through the insulation but not through the wire itself.
After you've cut through the insulation, gently pull on the end of the insulation sleeve. It should slide off the wire, exposing the bare wire underneath. Be careful not to pull too hard, as you don't want to damage the wire strands. Repeat this process for each wire you need to strip. It's important to ensure that you only strip the necessary amount of insulation and no more, as exposing too much of the wire can lead to electrical issues and safety hazards.
By following these steps and taking the necessary precautions, you can safely and effectively use wire strippers to strip the insulation off wire ends when installing a remodelling box.
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Frequently asked questions
Ensure the power is off at the electrical outlet and use a non-contact voltage tester to double-check.
You will need a stud finder, a torpedo level, a utility knife, a drywall or jab saw, and a screwdriver.
Remodeling boxes, also called old-work boxes, are installed after drywall has been hung, whereas new-work boxes are screwed to the wall studs before drywall is hung.
Use a screwdriver to knock a hole in the back of the old box at one of the knockouts and feed your new wiring through the hole.
Do not use metal-clad cables with plastic electrical boxes and avoid yanking wires too tight around a bend.
