Chloe Zhang
Plastic boxes are lightweight, cheap, and simple to work with. They are easy to punch holes into and many come with built-in clamps for the wires. However, they can be flimsy and can be crooked. When securing wire to a plastic box, it is important to ensure that the wire is properly clamped to prevent it from being accidentally pulled out. This can be done by using the built-in clamps or by employing other methods such as punching holes and feeding the wire through. It is also important to consider the type of wire being used, such as non-metallic (NM) cable, as this may require special clamps or connectors.
| Characteristics | Values |
|---|---|
| Plastic box characteristics | Lightweight, cheap, simple to work with, and easy to punch out holes in the back or sides |
| Plastic box safety | May not be as strong or damage-resistant as metal boxes, but can be used with Romex or NM wiring by attaching a grounding wire with a screw |
| Plastic box clamps | Many plastic boxes come with built-in clamps for wires, but it is not a requirement to use them |
| Metal box characteristics | Stronger, provide stronger attachment to the stud, and can be ganged together to create a larger box |
| Metal box safety | Must be grounded, and NM cable must be grounded by attaching the internal bare copper wire to a screw inside the box |
| Metal box clamps | Metal boxes have several different clamping methods, and some come with pre-attached clamps |
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What You'll Learn
Plastic boxes with built-in clamps
Plastic boxes are lightweight, cheap, and simple to work with. They are made of PVC, which can melt at high temperatures but does not conduct electricity. Many plastic boxes come with built-in clamps for the wires, which lowers the overall project cost.
The built-in clamps in plastic boxes are usually rectangular tabs that you punch open, and they spring back to hold the wire. Other clamps have a round opening with a pop-in plastic piece that acts as a one-way valve for the wire. These clamps are pushed past the cable as it goes into the box, and then spring back to grab the cable.
The use of clamps is recommended but not required, as the overriding concern is grounding. Metal-sheathed wiring depends on bonding with a metal electrical box for grounding. Using metal-sheathed wiring with plastic electrical boxes without other grounding measures can be highly dangerous.
Some plastic boxes have a spring connector moulded into the box, which may need to be coerced to open enough to fit the wire.
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Using a connector to secure the wire
Prepare the Wire and Plastic Box
Firstly, ensure you have the correct connector for the job. In this case, you will need a connector suitable for use with plastic boxes. Strip the insulation from the end of the wire to expose the conductor, and prepare the plastic box by locating the entry point for the wire. Plastic boxes usually have built-in spring tabs or flaps that will secure the wire, so identify these features.
Connect the Wire
Insert the exposed end of the wire into the connector. Ensure that the wire is securely seated in the connector and that no bare conductor is visible. Now, insert the connector and wire into the plastic box. You may need to coerce the connector to open enough to fit into the box, and ensure that the wire is securely held by the built-in spring tabs or flaps.
Tighten and Secure
Once the wire and connector are in place, ensure that the connection is secure. The connector should be tight enough so that the wire cannot be pulled out by hand, but be careful not to over-tighten, as this may damage the wire's insulation or crush the cable sheathing.
Safety Considerations
Always ensure that any electrical work is performed safely and in accordance with local regulations and codes. It is recommended to use a sealed box to prevent fire hazards, and all connections should be secure to prevent arcing or damage to the wiring. If in doubt, consult a qualified electrician.
Using a connector to secure a wire to a plastic box is a straightforward process, but it is important to take the necessary precautions to ensure a safe and secure connection.
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Securing wire entering from a conduit
Securing wires entering from a conduit requires careful attention to safety procedures. Here are some detailed steps to help you secure wires entering a plastic box from a conduit:
Prepare the Conduit and Wires
Before starting, ensure you have the necessary safety equipment, such as gloves and eye protection. Gather all the required tools and materials, including the conduit, wires, lubricant, and any necessary connectors or fittings.
Install the Conduit
If you haven't already, install the conduit securely, following local codes and regulations. This may involve cutting the conduit to the appropriate length and using fittings to join multiple pieces. Remember to deburr the conduit to remove any sharp edges that could damage wire insulation.
Pulling Wires Through the Conduit
To pull wires through the conduit, you can use methods like the fish tape method, the string method, or the conduit mouse method. The fish tape method involves using an electrician's tool with a long, flat metal wire wound on a spool. The string method is suitable for short, straight conduits and simply requires a strong string and a thin rod. The conduit mouse method uses a small cylinder of foam to help guide the wire.
Securing Wires at the Entrance of the Box
When the wires are in place, you'll want to secure them at the entrance of the box. For plastic boxes, they usually have built-in spring tabs that secure the cable as it's pushed into the box. Ensure the wires are firmly held in place and won't slip out under tension.
Additional Considerations
Remember to follow local electrical codes and regulations throughout the process. If you're unsure about any aspect of the installation, consult a qualified electrician. Additionally, consider the number of wires in your conduit and choose the appropriate size to avoid overcrowding.
By carefully following these steps and paying attention to safety, you can securely install wires entering a plastic box from a conduit.
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Grounding NM cables with metal boxes
Nonmetallic (NM) electrical cable needs special clamps for use with metal electrical boxes. Proper connection is essential to prevent damage. When it comes to metal boxes, there are several different clamping methods you can use, but first, you have to remove a knockout in the box. Knockouts are the little metal discs covering the holes in the sides or back of a metal electrical box. You remove as many knockouts as you need for the number of cables that will enter the box, and leave the others in place. A box should not have open knockout holes that are empty, as this compromises the protection offered by the box enclosure.
Some metal boxes come with saddle-shaped clamps already mounted inside the box. Usually, there are two clamps that can hold two cables each. If a clamp is not next to the knockout you are using, simply unscrew the clamp and move it to the desired location. There should be a pre-drilled hole for the clamp screw near each pair of knockouts. Insert the cable into the knockout and slide it under the clamp. Tighten the clamp's screw to secure the cable. A locknut-type clamp is the classic metal cable clamp with a short, threaded cylinder and locknut on one end and a saddle-type clamp with two screws on the other end. To install this type of clamp, insert the threaded end into a knockout hole in the box, then thread the locknut onto the threaded end from inside the box.
Tighten the nut with pliers. Insert the cable through the clamp saddle and into the box, and tighten the screws on the saddle to secure the cable. Orient the clamp so the saddle screws are facing you. This makes it easy to tighten the screws when installing the cable. You can also secure the clamp onto the cable first, then install the cable and clamp into the metal box. The newcomer on the block is the plastic push-in connector. There are several different designs for these, but basically, they are all plastic bushings that snap into the knockout hole in the metal box. The cable is inserted through the connector and secured with a spring-tab or other device.
Never run two cables into the box through the same knockout opening with pre-installed cable clamps. Each cable requires its own knockout opening and clamp. For installed clamps (whether they're metal or plastic), no more than 2 wires should be installed in each connector of this type. Be careful not to tighten cable clamps so much that they crush the cable sheathing or damage the insulation on individual wire conductors. The clamps should be just tight enough so that the cables can't be pulled free by hand.
When using nonmetallic boxes with Type NM cable, the grounding wire must be connected to the box using a grounding screw. This is a requirement for safety reasons and to ensure the correct functioning of the electrical system. In the unlikely event that your boxes don't have a pre-threaded hole, there are thread-forming grounding screws available. Generally, you just need to grab a bag of short 10-32 screws (you can find green ones in the electrical aisle, but they don't have to be green). They specifically need to be the "-32" or fine-thread variant so that they have sufficient threads in the box metal.
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Using cable clamps
When securing wires to a plastic box, one of the methods you can use is cable clamps. Cable clamps are important because they prevent accidental disconnection of the cable from the box, which could leave live wires exposed or damage other components in the circuit.
Firstly, ensure that the plastic box you are using is big enough to accommodate the wires. The National Electrical Code (NEC) specifies the minimum volume of boxes for different numbers and sizes of wires. This is to prevent overheating, short circuits, and fire hazards. Using the correct size box also makes it easier to connect and secure the wires.
Now, onto the steps for using cable clamps:
- Insert one end of each cable through an opening in the clamp so that there is at least 1/4 inch of sheathing inside the box. The cable should extend about 1/2 inch past the cable clamp to ensure a secure hold and prevent damage to the insulation.
- Attach the clamp to the box according to its instructions, ensuring that it is tight and secure.
- Strip off enough insulation from each conductor so they can be connected properly inside the box.
- Connect the conductors according to their intended function, using wire nuts, screw terminals, or other approved means.
- Fold the excess length of the conductors neatly inside the box to avoid interference with other devices or wires.
- Install any necessary devices, such as switches or receptacles, following the manufacturer's instructions, ensuring they fit snugly against the wall surface.
Some plastic boxes come with built-in clamps, such as spring tabs, that secure the cable as it is pushed into the box. However, if your plastic box does not have built-in clamps, you must use an external clamp to secure the cable.
It is important to note that cable clamps should be tight enough to hold the cables securely, but not so tight that they crush the cable sheathing or damage the insulation. Additionally, overcrowding holes with too many wires can cause issues, so each cable should have its own clamp and knockout opening.
By following these steps and guidelines, you can effectively use cable clamps to secure wires to a plastic box, ensuring a safe and secure electrical connection.
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Frequently asked questions
Most plastic boxes have built-in spring tabs that secure the wire as it's pushed into the box.
You can use plastic electrical box clamps or plastic junction boxes. Holes are easy to punch out in the back or sides of plastic boxes.
Metal boxes are stronger and more durable than plastic boxes. They also provide a stronger attachment to the stud.
Be careful not to tighten cable clamps too much, as this can crush the cable sheathing or damage the insulation on individual wire conductors.
