Wiktor Wise
DC electrical cables are prone to damage, which can cause electrical shorts that prevent the current from transmitting. Before attempting any repairs, it is important to test the cable's continuity to identify the problem. If the cable has exposed wires, it poses a serious safety hazard. Depending on the type of cable, there are various ways to test its continuity. For example, if you have a 120 or 240-volt cable, you should disconnect the power by unplugging it and then removing the cable from the unit. Once the issue has been identified, you can proceed with repairing the cable. This may involve cutting and soldering wires, using heat shrink tubing and electrical tape for insulation, or replacing connectors and plugs. It is important to note that repairing electrical cables requires caution and adherence to safety standards to avoid any potential hazards.
Characteristics and Values Table for Fixing a Broken DC Electrical Cable
| Characteristics | Values |
|---|---|
| Inspection | Check for exposed wires and test the cable's continuity |
| Tools | Exacto knife, boxcutter, razor blade, soldering iron, heat gun, multimeter, electrical tape, heat shrink tubing |
| Preparation | Cut and strip wires, note polarity, separate wires, twine them |
| Connection | Solder wires, slide heat shrink tubing over joints, seal with heat gun or soldering iron |
| Testing | Use multimeter to test for 19V DC on the DC plug on the output of the charger |
| Sealing | Use electrical tape to seal repaired areas, or cable jacket repair tape for PVC and rubber cables |
| Safety | Ensure no loose strands, follow electrical codes, use appropriate ferrules and crimping tools |
| Prevention | Use cable protectors, knot the cord inside the plug, or apply Sugru to reinforce the cable |
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What You'll Learn
Testing the cable's continuity
Testing the continuity of a cable is a straightforward process that can be performed using a multimeter. This test is important because poor continuity can cause fires, shocks, or damage to electrical devices.
To begin the test, ensure that the device you are testing is turned off and unplugged. Then, set your multimeter to the continuity setting. This setting may be indicated by a diode symbol, which is a triangle with a line on the right side, or a symbol that looks like sound waves. If your multimeter does not have a dedicated continuity setting, you can set it to the lowest number in resistance mode, as resistance is measured in ohms.
Once your multimeter is set to the correct mode, touch the metal parts of the terminals together to ensure that it is working correctly. If the number on the multimeter is less than 1, your device is functioning properly. Most multimeters will also beep to indicate that the signal is good.
Now, you can proceed to test the cable. To do this, stick the two terminals of the multimeter against the two ends of the cable. If you are testing a cable with multiple wires, touch pairs of wires together until the multimeter beeps, repeating this process for all combinations of wire pairs.
If the multimeter indicates an "open loop," it means that there is a break in the wire or a wrong connection, resulting in an open circuit. An open circuit indicates that the electrical current is not flowing uninterrupted from one point of the cable to the desired endpoint.
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Using electrical tape to patch exposed wires
- Before beginning any work on the exposed wires, ensure that you have turned off the power supply to avoid any electrical shocks. It is crucial to prioritize safety when working with electricity.
- Identify the damaged area and ensure that it is minor enough to be repaired with electrical tape. Exposed wires are hazardous and can lead to electrical fires, so it is important to address them promptly.
- Take the electrical tape and press it down directly on top of the exposed area. Wrap the tape tightly around the damaged section, ensuring good contact and coverage.
- Repeat the wrapping process three more times. Layering the electrical tape provides additional insulation and protection.
- Cut the electrical tape and secure the end to the cable.
- Apply electrical tape to the undamaged areas on both sides of the exposed wire. Slightly overlap this taping with the first section. This step strengthens the cable and helps prevent further damage or wear.
- Wrap the electrical tape around the undamaged areas four times, and then cut it. This ensures a secure hold and provides additional reinforcement.
While electrical tape can be a temporary solution, it is always best to consult a certified electrician for more significant issues or if you are unsure. They can assess the damage and provide a long-lasting and safe repair.
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Soldering wires together
To fix a broken DC electrical cable, you can cut the wires before and after the damaged area and solder the individual wires together. Soldering involves melting a low-temperature metal alloy over a joint or wire splice to secure two pieces together without the risk of them coming undone.
- Strip 1 inch (2.5 cm) of insulation off the end of each wire. You can use a wire stripper or a utility knife to do this.
- Wrap the wires around each other to start the connection.
- Melt the solder directly onto the wires to secure them in place. You can use 63/37 leaded solder, which is made of 63% tin and 37% lead and is the easiest material to work with for electronics.
- Cover and waterproof the exposed wires to seal them.
- Slide a piece of heat shrink tubing over each wire and use a heat gun or the barrel of the soldering iron to shrink the tubing and insulate the joint.
- Once both wires are soldered and insulated, connect the charger to the power supply and use a digital multimeter to ensure the connection is working.
It is important to note that soldering should be done well, as a poor joint can fail. Additionally, make sure to wear safety glasses to protect your eyes and wash your hands after handling lead solder.
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Using heat shrink tubing to insulate the joint
Heat-shrink tubing is a versatile tool that can be used to insulate wires and cables. It is a type of plastic tube that shrinks when heated, providing a snug fit over the wire or cable and protecting it from abrasion and environmental damage.
To use heat-shrink tubing to insulate a DC electrical cable joint, follow these steps:
- Choose the right size of heat-shrink tubing. The unshrunk diameter of the tubing should be larger than the cable, and the shrink ratio should be such that the tubing shrinks to a size smaller than the cable diameter. This ensures a tight seal.
- Slide the tubing onto the cable, covering the joint and extending past the exposed wires on each side.
- If you are insulating a wire splice, position the tubing so that it overlaps both sides of the splice equally.
- Heat the tubing with a heat gun or another heat source. Hold the heat gun 3-6 inches away from the tubing and turn it on. You can also use a soldering iron, a lighter, or an oven, but these methods may result in uneven shrinkage.
- The heat will cause the tubing to shrink and conform to the shape of the cable, providing a secure and insulated joint.
- If you are using adhesive heat-shrink tubing, you can heat it to near its melting point so that it fuses to the underlying material.
Heat-shrink tubing is a convenient and effective way to insulate and protect electrical joints. It is more durable and professional-looking than electrical tape and can provide a permanent solution for repairing cables.
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Replacing the plug
If the damage is at the end of the DC electrical cable, you can cut off the affected area, and replace the plug. This is a common issue, especially if the cable has been chewed by an animal.
Firstly, cut the cable where it is broken. Then, carefully cut and peel the insulation from the two cut ends to expose the wires. You can then cut the connector end off the broken adaptor and the end of the new replacement adaptor. Separate the wires and strip them. You can then twine the wires together and solder them.
To insulate the wires, you can use heat shrink wrap over the join. Alternatively, electrical tape can be used to patch the cord. However, this is not a long-term solution. A more permanent fix is to use heat shrink tubing over the soldered wire, and then use a heat gun to seal the tubing.
When connecting flexible wires to screw terminals, it is best practice to crimp ferrules to the ends with the correct tool. Make sure you use the correct size ferrule and crimping tool. You should also ensure that there are no loose strands going into the screw terminal. If you are connecting a three-terminal plug, make sure that the protective earth wire is the longest, so that it cannot be ripped out of the plug, leaving live wires exposed.
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Frequently asked questions
If your pet has damaged your electrical cable, start by cutting off the chewed part of the cable. Then, replace the plug and you're good to go.
Exposed wires are a serious problem and can cause electrical shorts. If the cable has exposed wires, you can use electrical tape to patch the cord. However, this is only a temporary solution. For a more long-term solution, use heat shrink.
First, disconnect the power by unplugging the cable. Then, remove the cable from the unit. If the cable is removable, clip a jumper cable across the male plug and insert the multimeter probes into the female plug. If the meter reading changes, the cord is faulty and needs replacing.
