Specifications for surface-mounted household electrical distribution boxes

Surface-mounted household distribution boxes are designed for easy installation, modular flexibility, and safety, with IP30–IP40 protection, halogen-free or thermoplastic materials, and module capacities ranging from 2 to 56.

Key Specifications

Module Capacity: Surface-mounted boxes are available in a wide range of module slots, typically from 2 to 56 modules, allowing for flexible circuit configurations depending on household requirements (Solera Arelos, DISBOX-DA) . Dimensions: The size of the box depends on the number of switches or modules. For small lighting or power circuits with fewer than 20 switches and incoming wire sizes under 10 mm², the width is calculated as the sum of switch widths plus 20 mm on each side, height as switch height plus 40 mm, and depth as maximum switch depth plus 10 mm. For larger installations or multiple rows of switches, additional space is added to accommodate wiring and terminal connections . Material: Boxes are typically made from durable thermoplastic (Solera Arelos) or halogen-free styrene (DISBOX-DA), ensuring long-lasting performance, UV stability, and compliance with safety standards . Protection Ratings: Common protection classes include IP30 (basic protection against solid objects) and IP40 (protection against objects larger than 1 mm), with impact resistance up to IK08 for mechanical durability . Installation Features:

• Mounting Rails: TS35 rails are standard for modular components, with integrated rails for smaller boxes and galvanized steel rails for larger boxes .
• Terminal Options: Insulated PE & N terminals, double-row screw terminals, or screwless spring-loaded strips are provided for safe and organized wiring .
• Accessibility: Many surface-mounted boxes feature open designs or removable covers for easy access to components, simplifying maintenance and upgrades .
• Wiring Space: Generous internal space is provided to accommodate bending radii of incoming wires, especially for larger wire sizes (>10 mm²) .
• Doors and Aesthetics: Optional smoked doors provide an elegant finish for visible installations while maintaining safety . Safety and Compliance: Clear labeling of module positions and terminals ensures unambiguous assignment of circuits. Boxes are designed to prevent hot spots, allow safe mounting of MCBs, and comply with standard electrical installation regulations .

Summary

Surface-mounted household distribution boxes combine modular flexibility, safety, and ease of installation. When selecting a box, consider the number of circuits, wire sizes, protection rating, material, and available space for terminals and wiring. Options like smoked doors, open-access designs, and integrated mounting rails enhance both functionality and aesthetics, making them suitable for modern residential electrical installations .