Flush-mounted electrical box Kopos KEZ 300 KB for external insulation systems, grey

The Kopos KEZ 300 KB flush-mounted electrical box for external insulation systems is a recessed under-plaster mounting box intended for installations in façades with insulation layers. Finished in grey, the box is designed to be embedded into the substrate behind external thermal insulation composite systems (ETICS) to accommodate switches, sockets and junctions while maintaining the required clearance and support for finishing renders.

Advantages

The unit provides a low-profile, robust enclosure that simplifies alignment with the outer insulation and render. Constructed from durable material suitable for embedding, it helps protect wiring connections from mechanical damage during installation and finishing. Its shape and dimensions are compatible with common recessed electrical devices and allow for neat plastering and render application around the mounting point.

Suitable for

• Mounting recessed switches and sockets in insulated exterior walls
• Electrical junctions and connection points behind external render
• New-build and renovation projects using ETICS or other façade insulation systems
• Situations requiring a flush finish with plaster or render over insulation

Key specifications

• Type: flush-mounted (recessed) under-plaster electrical box for insulated façades
• Finish colour: grey
• Intended application: external wall insulation systems and render layers
• Use cases: switches, sockets, junctions behind plaster or render
• Material characteristics: durable, embedding-suitable plastic designed for masonry and insulated panels

How to use

Position the box at the required mounting height and secure it to the substrate according to installation rules for external insulation systems. Ensure the box is level and its front edge is aligned with the planned thickness of the insulation and render so that the device surface will be flush with the finished façade. Run electrical cables into the box via the designated entry points, make connections following applicable wiring regulations, and fit the required recessed device. Complete the installation by applying insulation, adhesive, basecoat and finish render up to the box face, taking care not to obstruct device mounting or ventilation paths.

Usage recommendations

Verify compatibility with the chosen ETICS system and follow local electrical and building codes. Use appropriate fixing methods for the substrate and ensure sufficient clearance for the front plate and cover to achieve a flush finished surface with the render.