Tag Archives: heat shrink cable joints

Cable Jointing Methods Cold Technology and Heat Shrink Methods

Product Description

Cable continuity in any electrical network needs cable joints. This is undertaken when you need to repair or conduct maintenance operations on the cables or you want to extend the network to include some new machine or device. We can do this jointing in many ways and the most commonly used methods are given below.

Straight through transition and other kinds of joints

The power cable jointing kits might have straight through joint or a transition type of joint. Straight through finds use in XLPE to XLPE or PILC to PILC cables. The transition type is done from XLPE to PILC cable. This type of cable jointing is useful since it gives water-tight connectivity. So, you can use the joint even underground where there is much water stagnation.

Today you can see many types of joints in use. These include the push-on joints, the pre-moulded joints, heat shrinkable type, cold application joints, and the slip-on type. You should use jointing compounds in certain instances to make an effective joint.

Heat shrink joint

The Heat shrink cable joints find use in places where there is plenty of open space. The jointing is done without the use of resins or jointing compounds. This saves much time and effort compared to the other types of cable jointing methods. The immediate energisation makes it suitable for deployment in underground cable jointing situations.

Product 2 Main

Here you take the two ends of the cable. Then, bare the wire by removing the insulation and jacket. Then, clean the wire ends and make the connection. Push the sleeve on the joint and use a blow torch to fuse the sleeve over the joint. This makes it watertight and safe. One may use this type of joints in vertical and overhead jointing of cables. Further, the jointing is small and light in weight.

Cold jointing technology

In certain situations, it may not be possible to use heat shrink methods. This is due to the restrictions placed by the authorities due to the circumstantial conditions. For instance, there may inflammable gases or liquids in the vicinity that could ignite if one uses a blow-torch. This calls for alternative methods of dealing with the situation.

So, we use cold shrink methods for cable jointing. This method has several advantages compared to the heat shrink method. First, you do not need all the special tools and permits. This eases the situation so much that the work becomes light and tension-free. Second, the time needed for the installation is less than one-third that of the heat shrink method.

This kind of jointing is possible in tight, enclosed places where you could not use a blow torch. Also, you can operate the cold shrink method when the weather conditions are not ideal. Since the method is fairly straight and simple you can teach it to your team with ease.

It is possible to use smart material in your cold shrink joint so that the seal contracts and expands with every change in the load and the temperature. So, you can expect the joint to last as long as the cable itself. Failure rate becomes lesser.

Heat shrink joints: Use safe norms while making the cable connections

Product Description

Cable jointing is one of the basic parts of an electrical network. The need to make the joint arises when we need to repair the cable or we need to extend the cable to facilitate its use for another purpose. For making the cable joint, we need to make the connections first.

Keep the number of cores same

There are several electrical connection requirements that one must fulfil to make a connection. The connection is then sealed over in different methods to make the joint watertight and weatherproof. These would be heat shrink, cold shrink, slip-on, and so on. The first requirement is that the number of cores of the cable that we join is equal to that of the one that it is joining.

Heat shrink joint

For making heat shrink cable joints one uses the heat shrink sleeve. This is put on at the site of the joint such that it slips over one end of the cables and rests. The wires are bared and joined and then the heat sleeve is brought over the joint. Now, heat is applied in the form of a torch. The heat helps to shrink the sleeve over the joint and this makes the joint tight and waterproof. This method is useful when the site is open and there is place to use the torch. Further, the application should be safe for heat treatment.


Use of cold shrink cable joint

One cannot use this method when there is inflammable gas or fuel around. In those cases, a cold shrink joint is used. One can also use a slip-on type of joint since it does not involve open fire. In the cold shrink joint, the sleeve tightens on the joint when it is released. The slip-on type has a sleeve that gets fixed on top of the joint by tension. The sleeve is pre-tensed so that when it is released on top of the joint, it snaps into place and becomes airtight.

Electrical connection requirements

The other conditions that must be met include those related to voltage carried in the cables, the current rating, the use of proper conductors, check for insulations, and more. The types of connection used for wires include soldered connections, crimp connection, wire-wrapping connection, eye connection (otherwise known as the loop connection), and direct connection. The factors that determine the usage will be these.

Outdoor or not

If the use is for outdoor, the material must be tough and durable. They need to have the resilience to last long and serve the need. Similarly, the voltage needs are satisfied by making the connections separate for low-voltage, medium-voltage and high-voltage power supply. One must use the proper joint for the voltage otherwise the low-voltage joint will fail when applied to a high-voltage circuit.

Types of joint

The kind of joint needed must be right. This tells how we make the joint. The simplest is the straight-through joint where the two cables are joined at some point while the other connections carry on to other points in the circuit. Thus, you might have one or more advanced branch connections in the circuit.

Use of the proper jointing methods is needed to keep the circuit safe and functional. Always follow the norms laid down. Do not compromise on safety.