Alexei Volkov
Plastic wire connectors are used to make a tight connection with little interference between two or more electrical wires in an electrical box. They are made of flame-retardant materials and prevent wires from contacting exposed metal surfaces, which could cause a dangerous fault or short circuit. There are seven main types of wire connectors, each tailored to a specific purpose. This includes twist-on wire connectors, which are typically installed by hand, and crimp-on wire connectors, which require a crimping tool to attach correctly. When installing a plastic wire connector, it is important to follow the correct procedures to ensure a safe and secure connection.
| Characteristics | Values |
|---|---|
| Purpose | To make a tight connection with little interference between two or more electrical wires in an electrical box |
| Composition | Flame-retardant materials and insulating plastic exterior covering |
| Types | Crimp-on, twist-on, push-in, underground, waterproof |
| Removal | Use pliers to cut wires close to the connector |
| Reinsertion | Strip back the wire and reinsert into the connector |
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What You'll Learn
Removing a plastic wire connector
In general, plastic wire connectors are used to create tight connections between two or more electrical wires, preventing dangerous faults or short circuits. When removing a plastic wire connector, the first step is to try and gently pull it out. However, if it does not come out easily, you may need to use a small tool to release the connector. For example, a small flathead screwdriver or even a toothpick can be used to gently press down on a small spring tab that may be holding the connector in place. This will release the connector, allowing you to pull it out.
Alternatively, if you are unable to release the connector using the methods mentioned above, you may need to resort to cutting the wires. Using a pair of pliers, cut the wires as close to the connector as possible. This will allow you to create a splice if needed. Remember to exercise caution when using any tools near electrical wires to avoid any potential hazards.
It is important to note that some connectors are designed to be permanent, such as crimp-on connectors, and may require more force or specialized tools for removal. Always ensure you have a comprehensive understanding of the connector and its removal process before proceeding. If you are unsure, it is best to consult an electrician or a professional for guidance.
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Using pliers to cut wires
Firstly, you need to select the right cutters for the type and thickness of wire you plan to cut. For example, if you are cutting heavy-duty wire, you will need pliers with a larger "land" width (the actual width of the cutting edge), which will provide more leverage. If you are working in a confined space, you may need a smaller pair of cutters, such as the Diagonal Cutting Plier for Hard Wire Comfort Grips 140 mm.
It is also important to consider the condition of your pliers. Ensure that the cutting edges are sharp, as dull and worn-down edges will require more force and could compromise safety. The jaws should also be clean and free of grease, and you should oil the hinge regularly to make the tool easier to use.
When using the pliers, always pull rather than push, as pushing can cause the tool to slip, potentially leading to injury. Additionally, always wear gloves and goggles when cutting metal wire, as the sharp edges can pose a risk of accident.
For live electrical wires, it is crucial to use insulated pliers that are rated for the correct voltage and current.
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Twist-on wire connectors
To use a twist-on wire connector, first, strip and twist together the ends of the wires you wish to connect. Then, twist on the connector so that the wires are drawn into the connector's metal spring and securely squeezed together inside it. This prevents the wires from contacting other wires or exposed metal surfaces, which could cause a dangerous fault or short circuit.
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Crimp-on wire connectors
To use a crimp-on wire connector, you will need to strip and twist together the ends of the wires you want to connect. The wires are then inserted into the connector, which has a tapered coiled metal spring or interior grooves that hold the wires securely. When the connector is twisted onto the wires, they are drawn into the connector's metal spring and squeezed together, creating a tight connection.
It is important to select the correct size and type of connector for your specific application. Crimp-on connectors are available in various sizes and are commonly colour-coded to indicate their size or capacity. They are also designed for specific purposes, such as joining ground conductors or making underground connections.
After making the connection with a crimp-on connector, you can use a plastic cap insulator to cover the connection and provide additional protection. Underground and waterproof wire connectors, for example, are typically filled with 100% silicone sealant to protect against moisture and corrosion. These types of connectors are commonly used in outdoor applications such as sprinkler systems and low-voltage lighting.
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Pushing wires through plastic connectors
First, prepare the wires by stripping the insulation to expose the desired length of bare wire. The standard recommendation is to strip about 3/4 inch of insulation, but some people prefer stripping a longer section, up to 1 inch, to provide more flexibility. This step ensures a good connection and grip between the wire and the connector.
Next, you can start working with the plastic connector. Take the connector and fit it over the wire ends. Push the connector firmly onto the wires while twisting it in a clockwise motion. Continue twisting until the connector feels very tight and the bare wire ends are completely covered. It is crucial to follow the manufacturer's guidelines for this step to ensure the connection is secure.
Once the connector is in place, it's time to test its security. Tug on each of the wires gently to confirm that they are firmly in place. If any wire feels loose or pulls out of the connection, it indicates that the connector is not properly secured. In such cases, remove the connector and start the process again, ensuring a tighter fit.
Some electricians like to add an extra layer of protection by twisting the wires together before or after installing the connector. This is done by grabbing the ends of the wires or the connector with pliers and twisting them clockwise several times. While this step is not always necessary, it can provide peace of mind and prevent wires from coming apart or pulling out of the connector.
By following these steps, you can safely and effectively push wires through plastic connectors, ensuring a secure and reliable electrical connection. Remember to choose the right type of connector for your specific project and always follow safety guidelines when working with electrical wiring.
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Frequently asked questions
Plastic wire connectors are fasteners used to make a tight connection with little interference between two or more electrical wires in an electrical box. They are made of flame-retardant materials and prevent wires from contacting other wires or exposed metal surfaces, which could cause a dangerous fault or short circuit.
The process of installing a plastic wire connector will depend on the type of connector you are using. Twist-on wire connectors are typically installed by hand and may have external grooves to make them easier to handle and apply. Some connectors are designed to attach from the inside of an enclosure, while others attach from the outside.
First, strip back the wire and reinsert it into the connector. If this does not work, you will need to remove the connector, re-trim the wire, and re-crimp the wire with a pair of wire cutters. You can then solder the wire to the contact.
Plastic wire connectors can be purchased from hardware stores such as Home Depot, as well as online retailers like Amazon.
