Description
Cavity Box 35mm 3×3 W810: Compact Flush Mounting for Hollow Walls
The Cavity Box 35mm 3×3 W810, also known as an adaptor box or dry lining box, is specifically engineered for installing electrical accessories in hollow wall constructions. Its shallow 35mm depth makes it particularly suitable for situations where the wall cavity has limited space, such as in stud partitions with restricted depth.
Designed to accept a single socket outlet or switch, this box is inserted into a pre-cut hole in the plasterboard or panelling, allowing the accessory to sit flush with the wall surface for a clean, professional finish. The model designation W810 identifies this specific size and configuration within the standard range of cavity wall boxes.
Cavity Box 35mm 3×3 W810: Key Specifications
| Specification | Details |
|---|---|
| Model | W810 |
| Type | Single gang cavity wall box |
| Gang Size | 1 Gang (accommodates one single socket or switch) |
| Depth | 35 mm (shallow depth) |
| Dimensions | 3 x 3 inches (approx. 75mm x 75mm face) |
| Material | High-impact thermoplastic |
| Mounting | Flush (recessed into wall cavity) |
| Wall Compatibility | Plasterboard, drywall, gypsum board, timber panelling |
| Fixing Method | Adjustable rotating lugs / clamping mechanism |
| Cable Entries | Pre-scored knockouts on multiple sides |
| Applications | Single sockets, light switches, data outlets |
Cavity Box 35mm 3×3 W810: Why 35mm Depth Matters
The 35mm depth of this cavity box is a key feature that distinguishes it from deeper alternatives. This shallow profile offers several advantages:
Limited Cavity Spaces: Ideal for installations where the wall cavity is too shallow to accommodate a standard 47mm or deeper box.
Retrofit Applications: Suitable for retrofitting sockets into existing plasterboard where the void behind is restricted.
Material Saving: Requires less space within the partition, making it useful in complex studwork arrangements.
Versatility: Compatible with most standard accessories while occupying minimal cavity space.
Despite its compact depth, the box provides adequate space for cable terminations and connections when used with standard single sockets and switches.
Cavity Box 35mm 3×3 W810: Understanding the W810 Model
The W810 designation refers to a specific style and size of cavity wall box commonly used in electrical installations. This model features the classic 3×3 inch square footprint that accepts standard UK single-gang accessories.
The fixing centres align with the standard 60.3mm spacing used by virtually all UK socket and switch manufacturers, ensuring broad compatibility. The box is designed to work seamlessly with a wide range of white, black, and coloured wiring accessories.
Cavity Box 35mm 3×3 W810: Installation Features
Installation of this cavity box is straightforward, following the standard procedure for dry lining boxes:
Hole Preparation: A hole of the correct size (typically matching the box dimensions) is cut into the plasterboard using a drywall saw or hole saw.
Cable Preparation: Required knockouts are removed to allow cable entry. The box features pre-scored sections that can be easily pushed out.
Box Insertion: The box is inserted into the hole, with the adjustable lugs in their retracted position.
Securing the Box: The fixing screws are tightened, which rotates the lugs outward to clamp firmly against the back surface of the plasterboard.
Accessory Mounting: Once secure, the socket or switch is wired and fixed to the box using the standard fixing screws.
Cavity Box 35mm 3×3 W810: Construction and Materials
Manufactured from high-quality thermoplastic, this cavity box offers excellent electrical insulation properties and long-term durability. The material is selected for:
Impact Resistance: Withstands handling during installation and service.
Heat Resistance: Suitable for normal operating temperatures of electrical accessories.
Flame Retardance: Meets relevant safety standards for fire performance.
Stability: Maintains shape and fixing integrity over many years.
The box features clean, precise knockout points that remove easily without leaving sharp edges that could damage cable insulation.
Cavity Box 35mm 3×3 W810: Applications
This single-gang cavity box is suitable for numerous applications:
Residential New Builds: Installing sockets and switches in plasterboard partition walls.
Renovation Projects: Adding new electrical points to existing dry-lined rooms.
Commercial Fit-Outs: Mounting accessories in office partitions and retail displays.
Timber-Framed Construction: Providing secure fixings in timber-panelled interiors.
Home Offices: Creating convenient power and switch points in study areas.
Extension Wiring: Adding sockets to newly constructed room extensions.
Cavity Box 35mm 3×3 W810: Compatibility
This box is designed to accept a single standard UK pattern socket outlet, light switch, dimmer, or data outlet. It is compatible with:
13A switched and unswitched socket outlets
1-gang light switches (1-way, 2-way, and intermediate)
Dimmer switches
Blanking plates
Telephone and data outlets (RJ45, coaxial)
TV/FM sockets
The 35mm depth accommodates standard accessories without issue, though very deep smart home devices or dimmers should be checked for compatibility.
Cavity Box 35mm 3×3 W810: Quality and Compliance
Manufactured to meet relevant electrical installation standards, this cavity box provides confidence in its performance and safety. Quality features include:
Precise lug mechanism for secure fixing without damaging plasterboard
Smooth internal surfaces to protect cable insulation
Accurate knockout placement for flexible wiring routes
Consistent dimensions ensuring proper accessory fit
When installed correctly by a qualified electrician, the Cavity Box 35mm 3×3 W810 provides a secure, long-lasting foundation for electrical accessories in any cavity wall construction, combining practical functionality with reliable performance.
