Thanks all. I'm uploading a photo to show what's coming out of the back of the DVR. There are no properly followed health and safety rules/electrical safety standards that are followed in Sri Lanka so i'm at the mercy of the guys who installed my system (it was after a number of recommendations from other expats who had their systems installed by the same guy so i wasn't expecting any issues).
The guy supervising the installation is an electrical engineer so if i know the right questions to ask i can challenge the work, i just don't really know what to ask - I'm just pretty sure i'm not supposed to get electrical shocks from the DVR box and haven't seen heaps of blue and brown wires hanging out of a plug before! (Also no emergency fire service where the house is and am surrounded by trees - hence very worried that if things aren't right there could be risk of fire).
Again, any help/advice is really really appreciated. These guys i used came highly recommended so not sure who there i can ask! Thank you!