I know this question has been asked a few times, but I am planning where to run 8 core alarm cables and at a couple of points I will need to run parallel to 1mm^2 t&e for about 50cm. How much of a gap should I leave between the mains and alarm cables to avoid interference? I’ve heard in some places that running separate plastic cable trunking will do it, others that a 30cm gap will be fine and some people saying if it’s parallel for under 30cm it’ll be fine etc. Also considering installing spike suppressors just to be sure