Indoor lighting distribution boxes typically range from 200 × 200 × 120 mm to 800 × 600 × 300 mm for wall-mounted units, with freestanding cabinets reaching up to 2200 mm in height.

Typical Sizes

• Wall-Mount Enclosures: Common dimensions range from 200 × 200 × 120 mm up to 800 × 600 × 300 mm, depending on the number of circuits and internal components required .
• Freestanding Cabinets: These are larger, often 1600–2200 mm in height, 600–1800 mm in width, and 300–600 mm in depth, suitable for industrial or commercial applications .
• Indoor Terminal Boxes (Meyer-Lundberg style): Designed for single-phase or four-wire circuits with rated currents up to 100A, these boxes are compact for concealed installation and typically have stable, manufacturer-specific dimensions .

Material and Construction

• Front Cover: Usually made of anti-smash polycarbonate (PC) for impact resistance and aesthetic appeal .
• Bottom Cover: Constructed from high-grade ABS engineering plastic, offering heat resistance, corrosion resistance, and electrical insulation .
• Mounting Options: Surface-mounted or recessed installation is common, with flush mounting fixed inside walls and surface mounting attached to wall surfaces .

Installation Considerations

• Ambient Temperature: -5°C to +40°C, with 24-hour average ≤ +35°C .
• Relative Humidity: ≤50% at +40°C, up to 90% at +20°C (non-condensing), .
• Altitude: Suitable for installations up to 2000 m above sea level .
• Inclination: Installation should not exceed 5 degrees .

Summary

When selecting an indoor lighting distribution box, consider the number of circuits, rated current, mounting type, and available space. Wall-mounted boxes are compact and suitable for residential or office use, while freestanding cabinets accommodate larger industrial setups. Material quality and protection features ensure durability and safety for indoor electrical distribution .