Can you please advise whether PVC trunking is acceptable for outdoor use? I plan to install a short section through a wooden conservatory window frame to carry the 5v DC power supply for a CCTV camera, but I'm aware that PVC used to degrade in sunlight. Hopefully these days it's UV resistant? The stuff I'm planning on getting is this https://www.wickes.co.uk/Wickes-Round-Conduit---Black-20mm-x-2m/p/109639 and associated elbows, but it doesn't mention outdoor use, though 'sheds' suggests is should be okay.