Error After Neighbour Renovation: Wire Nicked in Trunking

Intermittent communication errors on a system whose wiring shares a trunking route with other building services. That route has been opened more than once for work unrelated to the aircon. The faults began at no particular moment that anyone can name.

A cable that fails intermittently and has been accessible to other trades is worth assessing on its exposure rather than its age. Shared trunking gets opened by whoever needs the services inside it. Cables are moved, pressed against edges and occasionally nicked in the process. The route matters more than the cable here, so establishing what else runs in it, and who has been in it, comes before any test.

Trunking is opened whenever anything inside it needs attention, and a communication cable sharing that space is handled by everyone who does so. Cables get pulled aside, pressed against the channel edge and occasionally caught by a tool. The damage is small and local. It produces an intermittent fault rather than an obvious one, so it survives repeated visits by anyone testing equipment instead of the route.

Repairing the damaged section is the immediate work, and separating the cable from the shared route is the durable part where the layout allows it. A cable that stays in shared trunking remains exposed to every future visit by every other trade. Where separation is impractical, protecting the cable within the trunking achieves much of the same benefit for very little extra work.