Megaphase expert advice: Electrical power cable terminations

Electric cables are designed to transmit electric current for both overhead and underground electrical designs. The safety of any building in this regard therefore depends on having the correct cables which efficiently and safely facilitate power transmission and distribution, installation which is done according to recommended safety standards and applying the right expertise when dealing with loose connections, disconnected joints as well as terminations.

Electronic research shows that loose connections and poor electrical terminations in both commercial and private buildings gives rise to heat, which travels from its point of origin, along the conductor in both directions; resulting in the insulation becoming brittle, delicate. This in turn causes cable disintegration. The result of this is a high resistance joint, possible damage to equipment, possible electric shock and fire hazard.

In order to avert these highlighted dangers, it is critically important to have trusted expertise in managing electrical joints and terminations because electrical joints and terminations provide the required electrical connection as well as the mechanical support, and physical protection of the cable.

There are different types of joints and terminations based on the function, type of cable and construction materials. Electric power cable joints are categorised into four broad categories of straight through joints, branch which can be a T or Y joint, pot ends and indoor/outdoor terminations. Straight through joints are used to extend pieces of electrical cables and can be used for indoor, outdoor, submerged and underground cable jointing. A Y AND T type branch joints is used to join low voltage, polymeric, non-shielded cables of between 1 and 5 cores. The branch jointing provides a reliable electrical connection, electrical insulation and mechanical protection. The pot end joints are used at the live voltage cable ends. Pot end joints are suitable for temporary and permanent cable sealing to provide safe termination of live power cables for indoor, outdoor as well as underground cables.

When it comes to terminations, the common types of terminations applicable are crimp connection, soldered connection, compression termination, wire-wrapping connection, direct connection and loop or eye connection.

All these different types of terminations are guided by common electronic principles which dictate that there is no damage to conductor and insulation, insulation is not clamped with conductor insulated right up to the metal of the terminal, sufficient slack made available on the cable, cable arranged neatly and not fouling moving parts or covers, no makeshift terminals used and terminal screws tightened sufficiently, this means This means that they should not be too loose or too tight. The best way to ensure this is to use the correct size screwdriver.

The set industry standard and requirement for joints and terminations is that they should meet the standards in terms of electrical and mechanical properties, insulation, earth continuity, environmental protection and more. This can be achieved by having and using the right technical and electrical knowledge and expertise.

One business house you can count on for professional electrical power cable terminations as well as managing electrical joints and supplies is Megaphase. You can visit our website on for free expert advice or:

Email: [email protected]

Tel: 012 803 0031

Fax: 012 803 0028.

You can also visit our Pretoria warehouse at

336 Alwyn Street




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