Cable Ducting

This process comprises the infilling of ducts that are placed under roads/railway lines/rivers and that have had cables pulled through them.

Pumping in a liquid material that encapsulates the cable allows the heat to be transferred from around the cable to prevent it from overheating. Thermal grouting is an engineering solution to infill a duct with an HT cable insert with a low Thermal Resistivity material.

Heat is the prime enemy of electric transmissions, because it increases wire resistance and shortens the lifespan of the cable insulation. Cross-country transmission lines suspended high in the air from steel towers are not insulated and heat is easily dissipated into the air. But for cables buried in a conduit under the ground, heat is confined.

Correctly applying thermal grout mixes is a critical element in constructing segments of underground power transmission lines. Thermal grout is used to transmit heat from underground electrical cables into the surrounding soil or rock. The correct grade of grout has to be used as defined by the client engineers.

The mix has to be pumpable over long distances but does not set hard.

Find out more about cable ducting from Bentonite (Manufacturing & Supply) Ltd by getting in touch with us today. We’re based in Kent and offer our products and services to customers across the UK.