Cavity box 35mm 3×6 W811

Description

Cavity Box 35mm 3×6 W811: Double-Gang Flush Mounting for Hollow Walls

The Cavity Box 35mm 3×6 W811, also known as a double adaptor box or dry lining box, is specifically engineered for installing two electrical accessories side by side in hollow wall constructions . Its 35mm depth makes it particularly suitable for situations where the wall cavity has limited space, while the 3×6 inch format accepts standard UK double-gang accessories.

Designed to accommodate two socket outlets or switches, this box is inserted into a pre-cut hole in the plasterboard or panelling, allowing the accessories to sit flush with the wall surface for a clean, professional finish. The model designation W811 identifies this specific double-gang configuration within the standard range of cavity wall boxes.

Cavity Box 35mm 3×6 W811: Key Specifications

Cavity Box 35mm 3×6 W811: Double-Gang Configuration

The 3×6 inch format of this cavity box provides the additional width required to accommodate two standard UK electrical accessories side by side. This double-gang configuration offers several benefits:

• Twin Socket Outlets: Perfect for installing 13A double sockets where two appliances need power from the same location.

• Multiple Switches: Accommodates two separate light switches or a combination of switches and dimmers.

• Combination Units: Suitable for socket and switch combinations or socket with USB charging ports.

• Space Efficiency: Concentrates multiple controls in one location, reducing the number of wall cutouts required.

Despite its wider format, the box maintains the same 35mm depth as the single version, ensuring consistency in installations where both single and double boxes are used.

Cavity Box 35mm 3×6 W811: Why 35mm Depth Matters

The 35mm depth of this double 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 deeper boxes .

• Retrofit Applications: Suitable for retrofitting double 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 double sockets and switches.

Cavity Box 35mm 3×6 W811: Installation Features

Installation of this double cavity box follows the standard procedure for dry lining boxes but requires a larger cutout to accommodate the wider format:

1. Hole Preparation: A hole matching the 3×6 inch dimensions is cut into the plasterboard using a drywall saw.

2. Cable Preparation: Pre-scored knockouts on the sides and base are removed as needed for cable entry. The box features 2 side knockouts and a 25mm base knockout for flexible wiring .

3. Box Insertion: The box is inserted into the hole with the adjustable lugs in their retracted position. The flanged edge prevents the box from slipping into the cavity .

4. Securing the Box: The fixing screws are tightened, which rotates the tough nylon lugs outward to clamp firmly against the back surface of the plasterboard. The large bearing faces provide maximum strength .

5. Accessory Mounting: Once secure, the double socket or twin switches are wired and fixed to the box using the standard fixing screws.

The design ensures quick and simple installation, saving both time and money on site .

Cavity Box 35mm 3×6 W811: Construction and Materials

Manufactured from high-quality flame-retardant 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: In the event of a fire, the box maintains its position within the wall until the wall loses structural integrity .

• 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 3×6 W811: Applications

This double-gang cavity box is suitable for numerous applications:

• Residential New Builds: Installing double sockets and twin switches in plasterboard partition walls.

• Renovation Projects: Adding new double electrical points to existing dry-lined rooms.

• Commercial Fit-Outs: Mounting multiple accessories in office partitions and retail displays.

• Kitchens: Providing double socket outlets for appliance workstations.

• Living Rooms: Installing twin switches for lighting control or double sockets for entertainment systems.

• Home Offices: Creating convenient power points for computers and peripherals.

Cavity Box 35mm 3×6 W811: Compatibility

This box is designed to accept two standard UK pattern electrical accessories side by side. It is compatible with:

• 13A double socket outlets (switched and unswitched)

• Twin light switches (1-way, 2-way, and intermediate combinations)

• Dual dimmer switches

• Combination units (socket with switch, socket with USB)

• Blanking plates for future expansion

• Data outlets in twin configurations

The fixing centres align with the standard 60.3mm spacing used by virtually all UK socket and switch manufacturers, ensuring broad compatibility.

Cavity Box 35mm 3×6 W811: Quality and Compliance

Manufactured to meet relevant electrical installation standards, this cavity box provides confidence in its performance and safety. Quality features include:

• Designed to meet BS 4662 requirements for flush mounting boxes

• 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

• Flame-retardant materials for enhanced fire safety

When installed correctly by a qualified electrician, the Cavity Box 35mm 3×6 W811 provides a secure, long-lasting foundation for double electrical accessories in any cavity wall construction, combining practical functionality with reliable performance .