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The 4x2 Surface Extension Wall Box made of steel is a rugged electrical enclosure used for mounting switches, sockets, or junction points on the surface of a wall, particularly in environments where durability is key. This type of box is essential when you cannot or do not want to recess the electrical components into the wall (a "flush mount" installation).
Key Features:
| Material | Steel (often Galvanised Steel for corrosion resistance) |
| Type | Surface Mount (or "Extension Box") |
| Size | 4x2 (Standard size for a single switch or socket). Nominal dimensions are typically $100\text{ mm} \times 50\text{ mm}$ on the face. |
| Dimensions (Approx.) | Height: 105mm |
| Width: 65mm | |
| Depth: 35mm to 50mm (varies by brand) | |
| Cable Management | Features pre-punched knockouts on the sides and back for easy entry of electrical conduit or cables. |
| Compatibility | Designed to accommodate all standard 4x2 faceplates (for light switches, socket outlets, data points, etc.). |
| Applications | Ideal for garages, workshops, industrial areas, basements, and commercial spaces where the wiring is exposed and requires a strong, protective enclosure. |
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