Wiktor Wise
Joining two electric cables together, also known as wire splicing, is a common task in home improvement and electrical repair. While it is advisable to consult a professional electrician for guidance, understanding the basics of wire splicing can empower individuals to tackle various electrical projects with confidence. This introductory paragraph aims to provide a foundational understanding of wire splicing, covering key considerations and common techniques to ensure safe and effective cable connections.
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What You'll Learn
Use a junction box
Junction boxes are plastic or metal boxes used to connect wires inside houses or apartments. They are typically used to connect a single power source to multiple outlets. Before you begin, check with a plugging circuit tester to ensure the power is off. Then, knock out a hole in the desired wall and insert the cable. You can use a fishtail to pull the cable through the cable clamp. Pull the electrical cables out from the junction box, leaving around six inches exposed. Cut the outer insulating jacket of the electrical cable with a utility knife to reveal the colour-coded insulated wires. Separate the wires with wire strippers, ensuring you strike 3/8 inches of the insulating jacket.
To connect the wires, grip the end of the white wire to the new fixture of the white wire in the junction box and trim any excess wire. Twist the wire clockwise and screw on the wire nut, covering the ends of the bare metal. Repeat this process for the green and black wires, connecting them to their respective wires in the junction box. Connect all the wires on the same day and ensure that the wire nuts cover any exposed metal. If the wires are joining electrical outlets with a terminal screw, turn the black wire anticlockwise around the brass-coloured terminal screw and tighten the screw with a screwdriver.
For outdoor use, you can use a PVC outdoor joiner with rubber seals to prevent moisture from entering. Alternatively, you can use a cold crimp (requiring a crimping tool) or a hot crimp (requiring a soldering iron or heat gun) with heat shrink tubing to waterproof the connection.
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Ensure cables are similar
It is essential to ensure that the cables you are working with are similar in terms of size, type, and capacity. Using dissimilar cables can lead to improper connections, compromised performance, and even safety hazards. Here's a detailed breakdown of the key considerations:
Size and Length: Verify that the cables have the same diameter or gauge. Cables with different sizes may have inconsistent resistance, affecting the overall performance of the circuit. Ensure that the length of the cables is also similar. If one cable is significantly longer than the other, it can lead to voltage drop issues and uneven current distribution.
Type and Material: Make sure that the cables are of the same type and made from compatible materials. For example, if one cable is copper and the other is aluminum, they should not be joined directly since aluminum has a higher resistance and behaves differently under load. Always use cables designed for the same purpose and environment, ensuring they have the appropriate insulation and jacket ratings.
Capacity and Rating: Check the amperage and voltage ratings of the cables. They should have similar current-carrying capacities to handle the load safely. Using cables with different ratings can lead to overheating, insulation breakdown, or even fire hazards. Ensure that the cables are suitable for the specific application, considering factors such as temperature rating, flexibility, and environmental resistance.
Color and Markings: While not directly affecting the electrical properties, matching cable colors and markings can be important for future identification and troubleshooting. Using cables with similar colors or marking patterns can help ensure consistency and make it easier to identify individual circuits or connections.
Stranding and Flexibility: Cables can be made up of multiple strands of smaller wires, and it's important to ensure that the stranding is consistent between the cables. Cables with different stranding patterns may have varying flexibility and current-carrying capacities. Inconsistent stranding can also affect the ease of termination and the security of the connection.
By ensuring that the cables are similar in these key aspects, you can guarantee a consistent and reliable connection. This attention to detail will help prevent electrical issues and ensure the safety and longevity of the joined cables and the system they are a part of.
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Prepare the wires
Before joining two electric cables together, it is important to prepare the wires properly to ensure a safe and secure connection. Here is a step-by-step guide to preparing the wires for splicing:
Firstly, ensure that you are joining two similar cables. The cables should match in terms of wire gauge and the number of individual conductors within the cable. Modern wiring often has this information printed on the outer sheathing, making it easier to identify. For example, a cable labelled "12/2 w ground" indicates that it contains two 12-gauge insulated conductors and a bare copper grounding wire.
Once you have confirmed the compatibility of the cables, it is time to expose the individual conducting wires within the outer sheathing. To do this, use a cable ripper to carefully slice through the outer covering. Insert the cable into the hole of the cable ripper until it reaches about 6 inches from the end. Gently press the sides of the ripper together and then draw it off the end of the cable, slicing through the sheathing. Do not use a utility knife as this may risk damaging the individual wires.
The next step is to trim away the severed portion of the sheathing and any paper filler inside. You can use the cutting jaws of a wire stripper or a utility knife for this task, being careful not to cut into the individual wires. Make sure you only expose enough wire to reach the connector and no more, as excessive bare wire can increase the risk of electrical hazards.
Before making the final connection, you can lightly coat the wires in di-electrical grease. This adds extra protection from contamination and can be especially useful if the connector does not explicitly prohibit it. Additionally, ensure that the connector matches the type of metal of the wire, as this is important for compatibility and safety.
By following these steps, you will have properly prepared the wires for joining. The next steps would involve choosing the appropriate connection method, such as soldering, crimping, or using wire nuts, depending on your specific application and requirements.
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Use mechanical fasteners
Joining two electrical cables with mechanical fasteners is a common method of creating a secure connection. This process can be done in several ways, each with its advantages and considerations. Here is a detailed guide on using mechanical fasteners to join electrical cables:
Crimping:
Crimps are a popular choice for joining electrical cables. They are mechanical fasteners that create a secure connection between wires. When using crimps, it is essential to have the correct crimping tool. The tool should match the specific gauge of the wire, ensuring a precise fit. Opt for a crimping tool with a piston-like action to avoid stress fractures in the connector. Additionally, consider using a light amount of di-electrical grease on the wires before crimping to protect them from contamination. After crimping, give the connection a good tug to ensure it holds firmly.
Wago Connectors:
Wago connectors are proprietary spring connectors designed for commoning two or more wires. They offer a quick and easy connection without requiring any tools beyond insulation stripping. Wago connectors are versatile and can be used for mains or low-voltage applications. Some Wago connectors have levers to release the spring, while others require firmly pulling the wire back and forth. These connectors are commonly used for loudspeaker cables and model train sets, allowing for simple connection and removal.
In-line Screw Terminal Connection Box:
For a safe and secure method of joining flexible mains leads, an in-line screw terminal connection box is recommended. This method involves stripping the insulation and firmly twisting the individual strands together before connecting them to a screw terminal. Ensure the bare end of the wire is long enough to make at least a half turn around the screw. When tightening the screw, wrap the wire in the same direction. This technique provides a secure connection and helps prevent strain on the join.
Splice Kits:
Splice kits, such as the Tyco splice kits, offer a UL-approved method of joining electrical cables. However, it is crucial to follow the instructions carefully. The cables need to be stapled on both sides within a certain distance to avoid any pull on the splice. Proper installation of splice kits ensures a secure and compliant connection.
When joining electrical cables with mechanical fasteners, it is important to select the appropriate method for your specific application. Each method has its advantages and considerations, so choosing the right one will ensure a safe and secure connection.
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Burying cables in concrete
Firstly, it is important to use the correct type of pipe or conduit for the cables. Plastic piping or solid PVC conduit is often recommended for burying cables in concrete. The PVC conduit should be of good quality and solid, with a bending spring, bush, and coupler for effective installation. This method helps to maintain the integrity of the cables and protect them from the surrounding concrete.
Another option is to use a pipe specifically designed for burial in concrete, known as a barrier pipe. This type of pipe can be made from polyethylene, which is inert and resistant to deterioration due to the lime content of the concrete. Copper pipes should be avoided, as they can react with the concrete and corrode over time. If copper pipes are used, they must be properly insulated to prevent corrosion and heat transfer issues.
The depth of the concrete layer is also important. A decent layer of cement, typically about 6 inches deep, is recommended to cover the conduit or piping. This ensures that the cables are well protected and that the weight of the cement does not crush the piping. It is also suggested to use armoured copex or a similar material for the electrical conduit to provide additional strength and protection.
Before laying the concrete, it is essential to insert a drawstring or cable into the conduit to ensure accessibility and ease of replacement if needed. Additionally, the curing process of the concrete should be considered, especially if using high alumina cement, as it can affect the outer sheath of the cables. Using Portland cement for grouting can help address this issue.
Overall, burying cables in concrete requires careful material selection, proper installation techniques, and consideration of the curing process to ensure the longevity and safety of the electrical cables.
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Frequently asked questions
Joining two electric cables, or wire splicing, can be done inside or outside a standard fixture box. If done outside, a junction box is used expressly for splicing. The best method is to run a solid, uninterrupted cable from the service panel to the device or from device to device.
It is important to join two similar cables. The cables must match in terms of wire gauge and the number of individual conductors in the cable. Modern wiring will have the gauge and number of wires printed on the outer sheathing. Before splicing, use a cable ripper to slice through the outer sheathing and expose the individual conducting wires.
Metal clamps can be used to tighten screws on the clamp until the cable is securely gripped. Standard wire nuts can also be used, but some electricians prefer to first twist the wires together with pliers. Mechanical fasteners like crimps can also work when installed correctly, but they are prone to vibration issues over time.
