GRP Surface Cable Trough - Cable de-rating

Hi Ben,

There was an article in Wiring Matters a few years ago covering outdoor surface level troughs which links to some papers by Aners and Slaninka. I believe that these papers are still referenced by cable sizing software but I don't think they've been incorporated into a standard (the software we use directly references the papers still).

https://electrical.theiet.org/wiring-matters/years/2020/83-november-2020/current-carrying-capacity-of-cables-installed-in-concrete-cable-troughs/

I would be very interested if there have been any updates though.

PS - Concrete and plastic troughs are of couse not the same in terms of thermal resistivty of the walls but the method should be similar.

Hi Ben,

There was an article in Wiring Matters a few years ago covering outdoor surface level troughs which links to some papers by Aners and Slaninka. I believe that these papers are still referenced by cable sizing software but I don't think they've been incorporated into a standard (the software we use directly references the papers still).

https://electrical.theiet.org/wiring-matters/years/2020/83-november-2020/current-carrying-capacity-of-cables-installed-in-concrete-cable-troughs/

I would be very interested if there have been any updates though.

PS - Concrete and plastic troughs are of couse not the same in terms of thermal resistivty of the walls but the method should be similar.