Installation of Cable Lugs
A cable lug is essential for the efficient use of electricity across applications as they allow different electrical systems to connect. Therefore, one must account for the quality of material used, the correct type of lug, the correct tools & dies used while crimping when installing cable lugs as they play a crucial role in ensuring the durability and reliability of the joint. Cable lugs are usually made of copper or aluminium. Bimetallic cable lugs made of copper and aluminium, such as to avoid galvanic action, in which two dissimilar metals are in contact with each other causing corrosion of one metal on the other.
Procedure for Installing Cable lugs
Correct identification of the cable lug to use:
Cable lugs are available in different sizes and specifications. There are four standards for them: The Indian Standards, DIN standards, BS Standards, and AS/NZ Standards.
Proper installation procedure:
While installing cable lugs, it is imperative to specify and install the correct type of cable lug based on its application and compatibility to ensure safe and reliable results. Improper connections can lead to increased joint resistance that can cause fires. Therefore, the correct installation of cable lugs is crucial. Prevention is better than the cure.
The quality of lugs can often be recognized by visual characteristics. For example, burr-free (without sharp edges) cable lugs with a flat palm and a cleanly shaped end are signs of a high-quality electrical connector. Despite the wide variety of cable lugs, each has a specific use and application stated by the manufacturer to avoid incompatible connections to be made. The correct cable lug can ensure the installation of a permanent electrical connection that is safe.
The cable is insulated and the insulation layer needs to be stripped away for it to be connected with the cable lug. Use an insulation stripper instead of knives or pliers for best results, as specialized tools will minimize the risk of damaging or fraying wire strands of the cable that would lead to improper connections. The amount of insulation coating to be removed should be approximately the depth of the barrel of the cable lug with some allowance of a few millimetres.
Cleaning the exposed wire before connecting it to the cable lug is a must. This can be done with a brush and should be done to each strand in the cable to ensure oxidation or tarnish is removed before use.
Connect the cable to the cable lug properly: The process is as follows -
- Insert the exposed strands of the cable into the barrel of the lug. The direction of the lug’s palm that is the flat outer part of the lug should be maintained in a manner that it becomes easier to connect the cable where it is to be connected.
- Make a joint using a crimping tool and dies.
Once the insulation-free part of the cable is connected to the lug, a secure connection between the cable and lug must be ensured. Following this, the barrel of the lug has to be squeezed around the strands of the cable so that all points of contact on the exposed cable touch the barrel of the lug that maximizes the efficiency of the connection. As cable lugs ensure long-lasting connection, the proper crimping tool dies are used as specified by manufacturers.
Proper crimping allows for no air spaces to exist in the cable and the barrel of the lug. All lugs irrespective of their type can only be crimped properly by using an appropriate cable crimping tool. Wrong crimping tools or an incorrect crimp can result in increased joint resistance, increased temperatures, and even fire as mentioned earlier.
If you are using an aluminium cable lug a special compound is used that allows it to deal with higher electrical loads to those cable lug connections without using the compound. These compounds use additives such as corundum that provide joint protection from oxidation, corrosion resistance, temperature stabilization, and friction. Using the compound material that is coarse like sand, cleans any remnants of oxidation, and allows for a clean contact surface for the cable lug and sleeve to connect. Furthermore, a hermetic seal produces an excess compound that oozes out of the mouth of the lug or connector that can be easily wiped off.
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