See also

Planning cable runs. Part 2

House wiring example

If you want to run bare cables to new lights or wiring accessories, perhaps as a temporary measure until you redecorate the room and can then conceal the cable runs, simply secure them in place with cable clips at about 300mm intervals. Clips are sized to match common cable sizes, and most are fitted with masonry pins for use on solid walls. Where possible, run the cable along the tops of skirting boards and up the architraves round doors.

With mini-trunking, simply stick, pin or screw the U-shaped base section to the wall or ceiling surface, adding fittings as necessary when the run changes direction. Then lay in the cables and snap on the cover strip to retain them. Cornice trunking is fitted in the same way.

With skirting and architrave trunking, you generally have to remove the existing mouldings first. Fix the new system as for mini-trunking.

If you have suspended timber floors, one of the easiest ways of running cables from one side of the room to the other is to use the void underneath the floorboards. Where the cable run is parallel to the joist direction and there is a ceiling below, it’s generally possible to lift a floorboard at each side of the room and feed the cable through. Beneath suspended timber ground floors, the cable should be clipped to the joists – from below if there is sufficient crawl space, or by lifting intermediate boards otherwise. Where the cable crosses the joist line, it can run through holes drilled in the centres of the joists, or in shallow notches cut in their top edges and protected from damage by metal repair plates – the former method is better.

What to do?

Start by lifting floor coverings to expose the floorboards. Then prise up floorboards as required (you may need to use a floorboard saw or a circular saw to cut through the tongues of interlocking boards). With runs parallel to joists, simply push the cable through between them. For runs across the joist line, lift one row of boards and use an electric drill or a brace and bit to make holes in the joists centres so you can pass the cable through.

If you have chipboard floors, start by cutting through the tongues along the joint lines. Then punch the fixing nails through the boards so you can prise them up without snapping them.

Point ot check:

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