Wall-mounted distribution box standard size

Wall-mounted distribution boxes typically range from 200×200×120 mm to 800×600×300 mm, with options in plastic or metal, IP ratings from IP20 to IP65, and modular configurations for residential, commercial, and industrial use.

Materials and Construction

Wall-mounted distribution boxes are commonly made from plastic (thermoplastic or FRP) or metal (steel or galvanized steel). Plastic boxes are lightweight, corrosion-resistant, and suitable for indoor use, while metal boxes offer higher mechanical strength and can be used outdoors when rated for IP65 protection . Metal boxes often feature 1.2–2 mm thick steel, painted (e.g., RAL 7035 gray), with a quarter-turn lockable door and rubber gaskets for water and dust protection .

Protection Ratings

• IP20: Basic protection against solid objects >12 mm, indoor use.
• IP55–IP66: Dust-tight and protected against water jets, suitable for outdoor or industrial environments.
• IP65: Dust-tight and resistant to low-pressure water jets, commonly used for outdoor wall-mounted metal enclosures .

Dimensions

Wall-mounted distribution boxes come in a wide range of sizes depending on application and module capacity:

• Small residential units: 200×200×120 mm up to 400×300×150 mm
• Medium commercial units: 500×400×200 mm up to 600×500×250 mm
• Larger industrial units: 800×600×300 mm or more These dimensions refer to external height × width × depth, with internal usable space slightly reduced by wall thickness, mounting plates, and door returns .

Mounting and Installation

• Flush-mounted: Installed inside the wall for a clean finish, common in residential applications .
• Surface-mounted: Hung on the wall surface, easier for industrial or retrofit installations .
• Studs and adjustable nuts: Facilitate easy mounting and removal of internal panels or MCBs .
• Knock-outs and cable entries: Ample top, bottom, and rear openings for conduit or cable entry, often with removable gland plates .

Internal Layout and Features

• Mounting plates: Galvanized steel plates for DIN rail or modular device installation .
• Busbars and terminals: Shrouded for safety, designed to prevent hot spots .
• Modular capacity: Residential consumer units typically support 7, 10, 15, or 20 modules, while industrial boxes can accommodate larger DIN rail assemblies .
• Accessories: Transparent inspection flaps, circuit identification labels, and optional extensions for additional modules .

Summary

When selecting a wall-mounted distribution box, consider:

1. Material: Plastic for indoor, metal for robust or outdoor use.
2. IP rating: IP20 for indoor, IP65 for outdoor/industrial.
3. Size: Match external dimensions to internal component layout and cable entry requirements.
4. Mounting type: Flush or surface-mounted depending on installation preference.
5. Modular capacity: Ensure sufficient space for MCBs, RCDs, and future expansion. These specifications ensure safe, flexible, and compliant electrical distribution for residential, commercial, or industrial installations .