Trunking 16x16mm, 16x25mm, 25x40mm and 40x40mm

This surface trunking is supplied in four profile sizes, so you can match the channel to the number of cables you need to route. The available sizes are 16 by 16 millimetres, 16 by 25 millimetres, 25 by 40 millimetres and 40 by 40 millimetres. Each size is offered in lengths of 2 metres and 3 metres, as listed in the product name. Trunking of this kind is used to house and protect cables that run across the surface of a wall, ceiling or floor, keeping the installation tidy and easy to inspect.

Surface trunking works by providing a base channel that is fixed to the building, with a cover that clips or snaps on once the cables are laid. The open channel makes it simple to add or change wiring later, because the cover can be removed without disturbing the rest of the installation. For many jobs this is a faster and less disruptive method than running cable inside walls.

Key features and specifications

• Four profile sizes: 16x16mm, 16x25mm, 25x40mm and 40x40mm
• Available lengths: 2 metres and 3 metres
• Surface-mounted channel with a separate cover
• Open channel for easy laying and later access to cables
• Suitable for holding and routing electrical and data cables

Choosing the right size

The smallest profile, 16 by 16 millimetres, is suitable for a small number of light cables, such as a single socket circuit or a data line. The 16 by 25 millimetre profile offers slightly more room for a few additional cables. The 25 by 40 millimetre size is a good middle option for runs that carry several cables, and the 40 by 40 millimetre profile gives the most space for larger bundles.

Before buying, count the cables that will go into the run and allow some spare capacity for future changes. It is generally sensible to avoid filling the channel to its limit, as this makes pulling cables through harder and leaves less room for heat to disperse.

Installation tips

Plan the route before cutting anything. Measure each run, mark the positions of the fixing points and check that the base and cover are the same profile. Cut the lengths to fit, and use the correct fittings for internal bends, external corners, tees and joins so the cover sits flush. Fix the base securely to a clean, sound surface, lay the cables in the channel without forcing them, and then clip the cover into place. Keep low-voltage and mains cables separated as your installation requirements dictate, and check local wiring rules before starting work.

Typical uses

• Adding new sockets or data points to an existing room without chasing into walls
• Tidying cable runs in offices, shops, workshops and reception areas
• Protecting wires from knocks and wear in busy or exposed locations
• Creating a clean finish for alarm, network or lighting cabling
• Making future changes and maintenance easier by keeping cables accessible

Why choose this trunking

Offering four sizes in one range means you can pick the profile that suits each part of a job, from a single small run to a larger bundle of cables. The two available lengths help reduce waste on shorter runs and make it easier to cover longer walls with fewer joins. Because the channel is open and the cover is removable, the cabling stays accessible long after the work is finished.

Whether you are fitting out a new space or tidying an older installation, this trunking gives you a practical and neat way to manage surface cabling. Choose the size that matches your cable count, plan the route carefully, and use matching fittings for a professional result.