Hey there! I'm a supplier of UL20711 multi core copper wire. And today, I wanna share some tips with you on how to repair damaged UL20711 multi core copper wire.
Let's talk about several common damages of UL20711 first
Before fixing, we need to first see through the problem. Different forms of damage have vastly different approaches to handling. UL20711 wire uses FEP insulation layer and nickel plated copper conductor, which looks solid but cannot withstand long-term exposure.
The most common is skin damage. For example, in some mechanical equipment, if cables rub against metal parts for a long time, scratches and cracks may appear on the surface, and in severe cases, the conductors inside may be exposed. If this situation is not dealt with in a timely manner, it is easy to cause leakage or signal interference. I have seen many cases where the device short circuits after running for a period of time, and upon closer inspection, the source is just an inconspicuous small crack.
Another issue is conductor breakage or poor contact. This is often not due to the wire itself breaking, but more often at the joint position. For example, if the equipment vibrates for a long time, causing the solder joints to loosen, or the joints to oxidize and the contact resistance to increase, it shows that the equipment is sometimes in good condition, sometimes in bad condition, or directly shut down. Some wires on high-temperature equipment may also experience fatigue fracture due to prolonged heating of the conductors.
Another more troublesome issue is overall aging. The insulation layer of wires that have been used for many years, especially those used outdoors or in high-temperature environments, may become brittle as a whole and may be damaged in multiple places. It is not recommended to only make partial repairs for this, and the overall security performance needs to be evaluated to ensure that it cannot continue to be guaranteed.
Attention: The core of the repair is to ensure security and performance. Never try to save time by simply wrapping it with ordinary electrician tape, as that would be like planting a ticking time bomb.
Practical repair toolboxes should be available on site
The repair tools don't need to be too complicated, just prepare basic tools and materials according to the on-site situation. The key is that the tools should be easy to use and the materials should match.
In terms of basic tools, a suitable wire stripping pliers are standard. Do not use those that are too sharp, as they may damage the copper core. Wire crimping pliers and diagonal pliers are also commonly used components for handling joints and cutting damaged wire segments.
The repair material is crucial, and the insulation material must be selected to match the original cable with sufficient temperature resistance. The solder and flux used for connection must be suitable for nickel plated copper conductors, otherwise they cannot be soldered or firmly secured.
In the auxiliary tools, a multimeter is necessary. After repair, it must be used to measure continuity and insulation in order to have a clear understanding. A hot air gun is used to heat shrink tubing, and the temperature must be adjustable, otherwise it is easy to damage the outer skin. Remember to wear insulated gloves during operation and pay attention to safety.
If repairing in outdoor or humid environments, waterproof glue and some specialized insulation repair sprays can be very effective. Especially for those sprays that can be operated with electricity, they can greatly shorten downtime.
Scene based repair, different situations require different methods to handle
There is no universal formula for repairing wires, it depends on where the fault occurs. Below, I will introduce several on-site solutions based on several typical situations.
The outer skin is only slightly scratched
If only a small incision is made on the outer skin without damaging the copper core inside, then the handling is simple. The first step is definitely to cut off the power first, safety comes first. Then use alcohol to clean the area around the wound, removing oil and dust. Next, use specialized insulation tape to tightly wrap the damaged area, wrap it in two more layers, and cover the edges wider. If it is a humid environment, seal another layer of waterproof glue outside. Finally, use a multimeter to test and confirm that there are no insulation issues before use.
The conductor is broken or the joint is loose
This situation requires a major surgery. First, use an electric meter to accurately locate the fracture point, and then cut off the damaged section, leaving some margin at both ends. Then strip the insulation layer at both ends to an appropriate length, not too long to expose too many copper cores, and not too short to connect.
When connecting, beginners recommend using terminal blocks for intuitive and reliable operation. If high conductivity is required, welding can be used. Align the copper cores at both ends, apply soldering flux, and firmly solder them with a soldering iron. Remember to clean up any excess flux after welding.
After the connection is made, it is time to restore the insulation. Put on the heat shrink tubing and heat it evenly with a hot air gun to tightly wrap around the joint. If there are still minor damages on the outer layer, add another layer of tape. After finishing everything, make sure to retest the continuity and insulation resistance.
The overall aging of the cable
This situation is quite a test of experience. If only one section is severely damaged and the rest is okay, you can cut off the damaged section and replace it with a new wire of the same specification, and connect it according to the above method. But if the entire thread is brittle and damaged in multiple places, I usually recommend replacing the entire thread directly. Repeated repairs are not only time-consuming, but also difficult to ensure long-term safety, especially on critical equipment.
Avoiding pitfalls reminder: Don't repeat these lessons again
I have seen too many cases of rework or even accidents due to improper operation during the years of repairing the production line. Here are a few experiences that I hope everyone can avoid.
Firstly, do not deceive the materials. Ordinary tape and low-quality heat shrink tubing must not be used as they cannot withstand high temperatures and time, and will quickly fail.
Secondly, cleanliness must be in place. If the oxide layer and oil stains on the surface of the copper core are not cleaned, the connection points will heat up and have poor contact, which is the main culprit of short circuits.
Thirdly, the operation should be gentle. When welding, the temperature should not be too high and the time should not be too long, otherwise the insulation layer will be burned out.
Fourthly, testing cannot be omitted. After repair, it must be measured with an instrument, don't just look at the appearance and think there is no problem.
The fifth factor to consider is the environment. In outdoor and corrosive environments, additional protection must be taken after repair, otherwise the wire will break quickly.
How to take care of it normally? Extending lifespan is fundamental
Repair is just an emergency, what can really help you save money is doing good daily maintenance.
Avoid hard injuries. Don't let the cables be pressed by heavy objects, and don't pull them randomly. Put a protective tube over it in areas that are prone to collision.
Choose the right environment. Try to keep the wires away from high temperatures, humidity, and corrosive areas. If it's really unavoidable, use specialized protective accessories.
Regular inspections. Use a multimeter to test the insulation and see if there are any cracks in the wire cover. Timely handling of minor issues will prevent them from escalating into major malfunctions.
Finally, if the malfunction is severe or the equipment itself is critical, such as high-voltage or high-risk systems, it is best to seek professional electricians to handle it. Safety is always the top priority.
In fact, the key to handling the fault of UL20711 multi-core copper wire lies in accurate judgment, selection of the right materials, and standardized operation. Having mastered these, whether it's repairing it oneself or guiding others to repair it, one can have a clear idea, which not only saves costs but also ensures the stable operation of the equipment.
