With regards to the material of ducts for cables the following question might arise:
Regarding the cable specification, can we specify HDPE as the material of construction for the ducts that the cable will be pulled through? Given that the temperature of the cable is rated for 90°C, will the HDPE be able to withstand this temperature?
Answer to the above questions could be as follows:
Although 90 degree C is the maximum permissible temperature at the interface of conductor/conductor shield to insulation. There are multiple heat dissipating layers which will considerably reduce the temperature when it comes to outer surface.
Bearing in mind service temperature of HDPE is 80 degree C, there might be no problem when HDPE pipe is hosting XLPE cable. On the other hand, outer jacket of cable is polyethylene (normally LDPE) and works properly while encasing the cable tightly.
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