I have a building (still under construction) with 220V power to it. I have a second building, already constructed also with 220V power to it. Between them is a path and rocky ground.
The path needs lighting (let's say 100W total) and the second building could use up to 3kW. The distance is around 50 metres from metre to second building.
What kind of cable do I need and how is the best way to run it?
My local building merchant (this is in rural Indonesia) sells NYM cable (pvc cable with 2 * 2.5mm conductors), as well as two-strand aluminium cable (normally used by the local power company to attach to housing).
I was thinking of burying cable in the path in cement, however I believe that NYM cable is maybe not suitable and I need NYY instead. Is there any minimum depth for this? Do I need to encase the cable in conduit? (For the time being I will sling the cable overhead, as we are not ready to work on the path, I believe that PVC cable is not sunlight resistant but it should be ok for a month or so (or I could use some PVC conduit for temporary protection)?)
I have attached some pictures of existing PVC cable and the site and as you can see the cable has degraded (over maybe 7 or 8 years).
I could also use the aluminium cable overhead, but it seems ugly and I would rather bury it
So do I need NYY cable (or something else?), and is it ok to cover it in a layer of concrete?