Hot under the collar – Voltimum

NAPIT Technical Development Engineer Richard Townsend discusses some of the issues the electrical installation industry seems to be facing when it comes down to cables covered by thermal insulation.

Given the constant drive to save energy, reduce energy bills and limit heat loss from a domestic dwelling, the use of government-backed and funded schemes to upgrade existing properties is widespread. The most common of these is to install large amounts of thermal insulation in the loft of older dwellings, as well as new builds.

On paper, this works very well, but there are some issues the electrical installation industry seems to be encountering. It has always been known that cables buried in thermal insulating material, will reduce their ability to dissipate heat, meaning they will reach their optimum operating temperature with less load applied. The amount of load required to require a

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