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lynx
@Airhead
Garden electrics regs are a bit mad. If you have some armoured cable it doesn't actually need protecting since the protection is built in via the earthed wire around the cable which also protects it against damage. So it can be left laying on the surface. It's 'mechanically protected'.
It's pretty common for a light fitting to have a very normal cable though and that's pretty vunerable to most kinds of garden implements. Exterior junction boxes are a pain too as we have such a range of weather, over time almost any junction box can be attacked by water, condensation or bugs. Or all three.
If you just want to wire some ethernet to a camera, even if it had an extra low voltage. Under (I think) 50ma possibly 12v power supply, that would be fine. You're able to do as you will with anything that's touch safe, which under 50ma is.