XLPE Cables in HDPE conduit

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.

Radio frequency for crane wireless remote controls

Radio frequency for crane wireless remote controls

Industrial band covers frequencies of 432-433 MHz. The radio remote controls sold by overhead crane manufacturers usually conform to international rules with regards to frequency and transmission power. Each system operates encoded and mated to its own

Should the customer require certain special frequencies then it must be sent to the manufacturer for evaluation and acceptance. However, since overhead crane manufacturers have been selling standard frequency transmitters for a long time, they are generally aware of the international and local regulations and there should not be any problem with the frequency