Wire mesh cable tray is the option people either adopt entirely or never consider. It is lighter, faster to install, and far more flexible on site than ladder or perforated tray — but it is not a universal replacement. It has a clear domain: light to medium cable loads, routes with frequent direction changes, and installations where field modification is expected. Outside that domain, ladder or perforated tray remains the right answer. This guide sets out where each wins, with the numbers that separate them.
What Wire Mesh Tray Actually Is
Wire mesh tray is formed from steel wire welded into a grid, typically supplied in lengths of around 3 m with widths commonly from 50 mm to 600 mm and heights of 50–150 mm. The wires run longitudinally and transversely, welded at each intersection. Material is usually steel wire with a surface finish — electro-zinc, hot-dip galvanised, or stainless — with the finish chosen for the environment in the same way as any other tray.
The construction has three consequences that drive everything else:
- Very open structure — typically the most ventilated of the common tray types, which helps cable heat dissipation and reduces dust accumulation.
- Low weight — materially lighter per metre than sheet-steel tray of equivalent width.
- Cuttable and formable on site — the tray can be cut with bolt croppers and bent by hand to change direction or elevation, without fabrication.
Wire Mesh vs Ladder vs Perforated: Head to Head
| Criterion | Wire mesh | Ladder | Perforated |
|---|---|---|---|
| Typical use case | Light–medium cable, data and instrumentation, routes with many direction changes | Heavy power cable, large diameters, long spans | General purpose, mixed cable, where some containment is wanted |
| Load capacity | Lower per unit width; verified per NEMA VE 1 / IEC 61537 load class | Highest; the standard choice for heavy and large-diameter cable | Moderate–high |
| Span capability | Shorter spans; check declared span for the width and load class | Longer spans achievable | Moderate spans |
| Ventilation | Most open — best heat dissipation | Very open | Partially open (perforations) |
| Cable support continuity | Grid supports small cables well; large cables sit across wires | Rungs support large cable well | Continuous surface; best for small cables |
| Site modification | Cut and bend by hand — no fabrication | Requires manufactured fittings | Requires manufactured fittings |
| Weight per metre | Lowest | Highest | Medium |
| Small-cable retention | Good — grid retains small cables | Poor — small cables sag between rungs | Best — solid surface |
| Cost per metre | Competitive; installation time often lower | Higher material cost | Moderate |
Where Wire Mesh Tray Wins
1. Data, Communications and Instrumentation Routes
This is wire mesh’s strongest domain. Data and instrumentation cables are small, numerous, and frequently re-routed. The grid retains small cables without additional fixing, the open structure makes adds and removals trivial, and the tray can be formed on site to follow the route rather than awaiting manufactured fittings.
Where power and data must be segregated, wire mesh is commonly used for the data route while ladder or perforated carries the power — the two are specified separately and kept apart.
2. Routes With Frequent Direction Changes
A route with many bends, elevation changes, and offsets is where wire mesh saves the most labour. Forming a bend on site takes minutes and needs no fitting, no lead time, and no measurement survey. On a complex route, this is a substantial saving over ordering and fitting manufactured bends.
3. Where Weight Matters
Lower weight per metre reduces hanger load and structural demand — useful on long runs, on lightweight roof structures, and on retrofits where the existing structure has limited spare capacity.
4. Where Ventilation and Cleanliness Matter
The open structure dissipates cable heat well and does not trap dust — relevant in food and pharmaceutical environments where wash-down and cleanliness matter, and where stainless wire mesh is specified for corrosion resistance.
Where Wire Mesh Tray Loses
1. Heavy Power Cable and Large Diameters
Large-diameter power cable needs continuous, well-distributed support and significant load capacity. Ladder tray’s rungs are designed for this; wire mesh’s grid is not. The load class is verified per NEMA VE 1 or IEC 61537, and wire mesh generally sits in the lower classes.
2. Long Spans
Span capability follows from stiffness, and wire mesh has less of it than sheet-steel tray. Long spans between supports are a ladder application. Check the manufacturer’s declared span for the specific width, load class, and support arrangement rather than assuming a value.
3. Where a Solid Bottom Is Required
If the specification requires containment — to catch drips, to prevent debris falling, or to meet a particular installation requirement — perforated or solid-bottom tray is needed. Wire mesh will not contain anything.
4. Where Fire-Rated Cable Support Is Critical
Cable support performance under fire conditions is a declared property that varies by type, material, and design. Where a specific fire support performance is required, confirm the tested performance of the actual product rather than assuming equivalence between tray types.
Application Case: Data Centre Fit-Out With Frequent Re-Routing
Scenario Constraints
A data centre fit-out requires overhead routes for structured cabling across a floor plate, with power distribution units fed from a separate ladder tray route. Cable counts change during fit-out and are expected to change again as tenants move. The route has frequent direction changes around structural elements. Installation window is tight, and the client wants the ability to add cables without specialist tools or new fittings.
Selection Approach
Wire mesh for the data route, sized on fill rather than on load. The governing constraint is the number and diameter of data cables the tray must accommodate — calculated against the applicable fill requirement — with the load class checked as a secondary condition. Because additions will continue after handover, specify the tray with reasonable spare fill capacity rather than sizing to the initial cable count.
Ladder tray for the power route remains the correct choice: larger power cables, longer spans between structural supports, and no expectation of frequent modification. The two routes are kept separate to avoid coupling between power and data.
Finish: for an internal conditioned data hall, electro-zinc or pre-galvanised is typically adequate. If the same route extends into a plant room or any damp area, specify hot-dip galvanised for that section.
Common Mistakes
- Using wire mesh for heavy power because it is cheaper per metre. The load class and span will not support it. Check the declared load class against the actual cable weight.
- Sizing by width alone and ignoring fill. Fill is calculated from cable diameters against the applicable fill rule; a tray can be wide enough in principle and still non-compliant.
- Assuming all finishes are equivalent. A stainless data-hall install and a galvanised plant-room install in the same project are normal. One finish for the whole site is the usual cause of early corrosion.
- Cutting without treating the cut ends. Every cut on coated wire exposes bare steel. On pre-galvanised or electro-zinc product in a damp area, this is where corrosion begins. Use hot-dip galvanised where cutting is expected in such areas, or treat cut ends.
- Assuming mesh can carry fault current. As with any tray, if it is to serve as an equipment grounding conductor, the cross-section and joint continuity must be verified. Do not assume it.
- Over-supporting out of caution. Excessively close support spacing wastes material. Use the manufacturer’s declared span for the width and load class.
Acceptance Checks
- Load class verification — declared load class and span confirmed against actual cable weight and support spacing.
- Fill check — cable cross-sectional area assessed against the applicable fill requirement for the tray type.
- Finish verification — coating type and, for galvanised product, thickness measured at sample points.
- Cut-end treatment — confirm cut ends are treated or the finish is appropriate for the location.
- Support spacing — measured against the declared span, with supports near direction changes.
- Earthing and bonding — continuity verified along the run where the tray forms part of the earth path; a separate conductor provided where it does not.
- Segregation — confirm power and data routes maintain the required separation along the full length.
Selection Checklist
- What cables, and how heavy? — this decides mesh vs ladder more than anything else.
- What span is available? — check the declared span, not a rule of thumb.
- How much will the route change? — frequent change favours mesh heavily.
- Is containment required? — if yes, mesh is out.
- What is the environment? — drives the finish, and the answer may differ by zone.
- Is the tray the earth path? — verify cross-section and joint continuity, or add a separate conductor.
- Will it be cut on site? — if yes, consider hot-dip galvanised or plan cut-end treatment.
Frequently Asked Questions
Can wire mesh tray replace ladder tray everywhere?
No. It excels at light to medium loads, data and instrumentation, and routes that change. Heavy power cable, long spans, and containment requirements all point back to ladder or perforated tray.
Is wire mesh tray strong enough for power cable?
It depends on the cable weight, the width, and the declared load class. Light power circuits can be appropriate; large-diameter or heavy power cable generally is not. Check the declared load class and span rather than assuming.
How do I cut wire mesh tray on site?
Bolt croppers or a suitable cutting tool, cutting across the transverse wires. Treat the cut ends where the finish is thin, and avoid leaving sharp projections that could damage cable jackets.
Does wire mesh tray need special fittings for bends?
Usually no — the tray can be cut and formed on site to create bends, tees, and elevation changes. Manufactured fittings exist where a neater or more heavily loaded junction is needed.
What fill applies to wire mesh tray?
The applicable fill requirement for the tray type as set out in your wiring rules. Fill is assessed on cable cross-sectional area against the tray’s declared usable area — confirm the method for mesh tray specifically, since its open structure differs from solid-bottom types.
Can wire mesh tray be used outdoors?
Yes with a suitable finish — hot-dip galvanised or stainless. Avoid thin electro-zinc finishes outdoors, especially where the tray will be cut, since exposed cut ends corrode first.
Is wire mesh tray suitable for food and pharmaceutical areas?
Often yes, in stainless. Its open structure does not trap dust and it lends itself to wash-down environments. Confirm the grade — 316/316L where chlorides are present — as for any stainless tray.
Choose the Right Cable Tray Type with BANGE Electric
BANGE Electric supplies wire mesh, ladder, perforated, and trunking cable tray with declared load classes, spans, and fill data per NEMA VE 1 and IEC 61537. Send us your cable schedule — types, diameters, and weights — along with span, environment, and whether the route will change, and we will specify the tray type and size per section.
Compare all cable tray types or check fill capacity.
Requirements may vary by application, market, and applicable standard. Figures given here are illustrative examples; always confirm against manufacturer data and your project specification.