Heating cable connectors

A very common mistake is the damaging or incorrectly placement of heating cable connectors.

Heating cable connectors are used for the connection of resistance/heating cables (resistance) and supply cables – known as Cold Leads (CL). The connection is made via cable end sleeves, which are hard and inflexible. The connection must not be subjected to bending stress – there is a danger that the sleeve will literally sever the resistance wire during bending. Mechanical damage can also occur when the cable is bent immediately behind the connector – the sharper the bend, the greater danger there is.

Installation companies often do not realize that the connector heats up over up to half of its length (the connection between the resistance wire and the supply lead) in exactly the same way as the heating cable. Correct installation should therefore be carried out so that the connector is placed completely straight and covered with screed or flexible sealant not only along its entire length, but also plus 5 cm of the heating cable and 5 cm of the supply lead beyond the connector.

Virtually the whole connector has been pulled into the perimeter wall, where there is no reliable heat dissipation. The second mistake is the bending of the heating cable immediately after the connector – heating and the different expansion of materials in the bend create cyclic mechanical stress on the joint, which can lead to its interruption
The connector has been pulled into the gooseneck at the side of the cold lead. Pulling the cable into the connector itself creates unwanted mechanical stress on the connection, and the subsequent steep bend in the wall upwards into the wiring box led to a complete break in the cable at the connection point
Another example of incorrect laying – the gooseneck has been placed across the connector, which prevented the sufficient flow of concrete over the connector and resulted in point overheating of the connector. Also, the cable is bent immediately after the connector