Why an Accessory-Free Cable Tray Installs Faster
Where installation time actually goes
Specifying an easy to install cable tray sounds like a minor detail until you look at where the hours actually go. Ask a contractor and the answer is rarely the tray itself. It is the joints. It is walking back to the container for a bag of couplers. It is waiting on a fitting that was measured wrong three weeks ago. It is two people holding a length in place while a third finds the right bolt.
The tray gets fixed quickly. Everything around the tray is what eats the programme.
This matters more now than it did a decade ago. Labour is the scarcest resource on most sites, and how quickly a containment system goes up is no longer a secondary specification detail. It is a direct lever on the programme. Understanding where the time goes is the first step to shortening it.
The hidden cost of couplers and fittings
Start with simple arithmetic. Wire mesh cable tray is typically supplied in 3 metre lengths. A single 100 metre run therefore contains roughly 33 joints.
On a conventional system, every one of those joints is an assembly operation. Separate splice plates, separate fasteners, a tool in hand, and a torque check. Multiply a two or three minute operation by 33, then multiply that by the number of runs in a building, and the number stops looking trivial.
Then add the procurement layer. Couplers are consumables. They get ordered by estimate, they get lost, they get over-ordered to avoid running short, and the surplus is written off at the end of the job. The cost of a coupler is small. The cost of not having one at 3pm on a Friday is not.
Fittings behave the same way but worse, because they have to be predicted. Every bend, tee and reducer has to be identified at take-off stage, ordered, delivered and stored. When the route changes on site — and it does — the fitting that was ordered no longer matches the route that was built.
What a self-locking joint changes on site
A self-locking system removes the joint from the consumables list. Two lengths engage directly with each other, mechanically, without a separate connecting component.
The change is not only in the seconds saved at each joint, although those add up. The change is in what disappears from the process around it. There is no coupler to order, no coupler to carry, no coupler to run out of, and no coupler to leave off a joint because the bag was empty.
It also removes a quality variable. A bolted coupler is only as good as the person who tightened it, and on a 33 joint run there is a reasonable chance that at least one was not fully made off. A mechanical engagement is either engaged or it is not, and that is visible at a glance during inspection.
CK developed its self-locking wire mesh system around exactly this problem, and it sits alongside the conventional standard wire mesh cable tray range rather than replacing it. Which one belongs on a given project depends on the route, and the honest answer is not always the same.
Working out whether a self-locking system suits your route? Send us the run lengths and bend count and our engineering team will estimate the component reduction.
Forming bends without ordering fittings
The open grid structure of wire mesh tray allows bends, tees and offsets to be formed on site with a cutting tool, without a purpose-made fitting. For a route that changes during first fix, this is the single largest source of saved time.
It is worth being precise about what this does and does not mean. Field forming is fast and it removes a procurement dependency. It also relies entirely on the installer following the manufacturer’s forming instructions, because a cut and folded section is not a tested fitting.
IEC 61537, the international standard for cable tray and cable ladder systems, sets out safe working load requirements and tests lengths, fittings, supports and cantilever brackets as separate items. A manufactured fitting carries a tested load rating. A field-formed bend does not, and where a route is heavily loaded or safety critical, the tested component is the right choice.
In practice most projects use both. Field forming handles the majority of route changes; manufactured fittings such as horizontal tees and inside bends handle the loaded transitions where a rated component is required.
Handling, weight and single-person lifts
Weight decides how many people a length needs, and how many people a length needs decides the crew size for the whole package.
A 300 mm wide tray with a 60 mm side rail weighs approximately 1.71 kg per metre, so a standard 3 metre length is around 5 kg. Even at 600 mm width the figure is roughly 2.81 kg per metre, or under 9 kg per length. These are one-person lifts, at height, on a ladder or a podium, without a second operative standing by.
That is not a marginal benefit. It changes how the work is programmed. A containment package that can be installed by individuals working in parallel finishes differently from one that requires paired working throughout.
When an accessory-free system is not the right answer
Speed is not the only criterion, and there are routes where a self-locking system is not what we would specify.
- Heavily loaded primary routes. Where the run carries close to its rated capacity across long spans, tested fittings and closer support spacing matter more than installation speed.
- Systems used for equipotential bonding. Where the containment forms part of the earth continuity path, the joint specification is an electrical decision, not a productivity one, and national wiring rules govern it.
- Highly repetitive, fully prefabricated routes. Where the layout is fixed and identical across dozens of floors, ordering manufactured fittings in bulk removes the on-site forming step entirely and can be faster overall.
- Environments with severe vibration. Mechanical plant rooms and some process areas justify a bolted, torque-verified joint.
A product that suits every route usually suits none of them particularly well. Knowing where a system does not belong is part of specifying it properly.
A representative site comparison
The following is an illustrative scenario rather than a specific project, intended to show how the arithmetic behaves.
A distribution facility requires 1,200 metres of 300 mm wire mesh containment across four levels, with an estimated 90 direction changes. On a conventional coupled system this represents roughly 400 joints, each requiring a coupler set, plus 90 fittings identified at take-off and ordered ahead of installation.
Midway through first fix, a plant room relocation moves two risers. Around 15 of the ordered fittings no longer match the built route. The replacements are a lead-time item, and the containment package holds up the cable pull behind it.
On a self-locking system with field-formed transitions, the 400 coupler sets are not in the procurement scope at all, and the 15 affected direction changes are re-formed on site the same day. The delay does not occur. The material saving is real but secondary; the programme protection is the actual benefit.
This pattern repeats in almost every fast-moving fit-out, and it is particularly visible in data centre environments, where containment routes are dense and rarely finalised before installation begins.
Frequently asked questions
Does a self-locking joint hold as well as a bolted coupler?
A properly engaged mechanical joint is designed to meet the same safe working load requirements as the length it connects. What differs is the failure mode of the process, not the product — a bolted coupler depends on correct tightening at every joint, while a mechanical engagement is visibly either made or not made.
Can bends be formed on site on any wire mesh tray?
Most wire mesh systems allow field forming, but the method and the limits are set by the manufacturer. Loaded or safety critical transitions should use a manufactured fitting with a tested load rating.
How much support spacing does an accessory-free system need?
Support spacing is determined by tray width, side rail height, wire diameter and cable load, not by the jointing method. It should be taken from the manufacturer’s load data for the specific configuration.
Does faster installation mean lower quality?
Not where the time saving comes from removing steps rather than skipping them. Eliminating a coupler removes an assembly operation and its associated inspection point; rushing a coupler does not.
Are cut edges a problem for cable insulation?
They can be. Field-formed sections should be cut cleanly and finished so that no burr remains in contact with the cable, and cut surfaces on galvanized products should be treated in line with the manufacturer’s guidance.
Faster first fix, without cutting corners
An easy to install cable tray is not a shortcut. It is a system where fewer things have to go right for the installation to be correct — fewer components to order, fewer parts to carry, fewer operations to inspect, and fewer dependencies between the containment package and everything queued behind it.
CK manufactures its wire mesh systems at a fully automated facility in Kemalpaşa, İzmir, with published weight, cross-sectional capacity and coating data for every configuration, in EG, pre-galvanized, hot dip galvanized and stainless finishes.
Send us your route drawings and load requirements. We will come back with a configuration, a support spacing recommendation and a component list for the whole package.
