Will the 20 kilowatts with 380V power supply to use much of the copper wire?
That is a concept, you want to put anything can be.
The provisions of the provisions of the cable tray is strictly prohibited lay the upper reaches of the thermal pipe, if limited to space constraints, you can use pad insulation materials
Fiber multimedia information box: light cat (onu), network module, TV module, telephone module. General on the configuration of these, my Google space there are related pictures you can look at