Trunking FAQs

1Which D-Line cable trunking should I select?
The choice of cable trunking should consider the volume of cables being concealed. Check the D-Line dimensions provide sufficient capacity for your requirements.

When containing mains voltage cables, 45% of capacity should remain unfilled for air circulation and heat dispersion. Note product dimensions are external dimensions – please consider trunking wall thickness is typically 1mm; in other words 30x15mm trunking will have internal dimensions approx. 28x13mm.
2Any tips for measuring up?
Remember to leave space (between D-Line lengths) to accommodate accessory required. Use the accessory as the template. Pencil mark the surface and the length. After installing the lengths, then inserting the cables, the Smooth-Fit Accessory will retro-fit into the space(s) you left.

If using Clip-Over Accessories for Micro+, Mini Trunking, TV 50 x 25mm or ¼ round Trunking / Floor Trim, the gap does not have to be precise, but ensure the lengths are spaced so the rear tabs will grip i.e. the lengths are not too far apart! Clip-Over Accessories will fit over the gaps you left.
3Any tips for cutting D-Line lengths?
For best results use a junior hacksaw and - if preferred - cutting block to help keep blade straight. If using Smooth-Fit Accessories a straight cut is important, so the accessory can fit neatly up to the length. If using Clip-Over Accessories (currently only available for Mini Trunking and ¼ round Trunking/Floor Trim) cutting and measuring doesn’t need to be as precise, as the accessories allow a 10mm tolerance.
4Pictures show the click-lock at the top side. Can it be at the base instead?
Yes, an installation can be reversed, but the lid then no longer acts as a cable retainer. Installers usually prefer the hinge at the base, so cables are not dropping out along the way!
5How many times can the hinge be opened?
D-Line lengths can be opened and closed thousands of times, making it easy to later add or remove cables if required. The hinge is tensioned so it is not too stiff or slack, making D-Line easy to handle.
6Can you rely on the self-adhesive for permanent fixing?
For Micro, Micro+, Mini and ¼-round D-Line lengths - the tape gives a strong bond so take care before securing to the surface. It is possible that tapes can eventually lose effectiveness as adhesive elements vaporise over time, but we have known lengths stuck to smooth clean surfaces (by our self-adhesive) for many years. If using a large cable trunking (such as our TV drop 50mm x 25mm) then because of the greater weight and strain on the tape, we always advise installers to also use a secondary fixing (wall plug & screw) spaced every 30cm.