Specifications and Dimensions of Indoor Distribution Boxes

Indoor distribution boxes are standardized enclosures designed for safe and organized electrical or telecommunication connections, with dimensions and capacities varying by module type and number of pairs.

General Specifications

Indoor distribution boxes are primarily used for connection and branching of electrical or telecommunication circuits. They are typically made from lightweight steel or mild steel, often finished in grey (RAL 7032 or RAL 7035), and comply with IP20 protection rating according to DIN 450050 standards for indoor use . Doors are usually removable and lockable, providing 180-degree access, and can be hinged on either side depending on installation requirements. Many boxes include jumper rings for cable management and document wallets for labeling and documentation .

Capacity and Module Support

Distribution boxes are categorized based on the number of pairs or modules they can accommodate:

• Standard 500 series boxes: Support 2–10 pair LSA-PLUS® modules.
• 510, 520, 530, 540 series: Support 340, 680, 1020, or 1340 pairs respectively .
• Boxes can be configured to support 1-way to 36-way modules, depending on the model .

Dimensions

Typical indoor distribution box dimensions vary by type and capacity:

• Small boxes: Approximately 65 x 65 mm up to 361 x 254 mm, with multiple cover heights available .
• Larger multi-pair boxes: Dimensions are scaled to accommodate the number of pairs, with length, width, and height specified in manufacturer catalogues .
• Single-gang boxes: Designed for one device, while multi-gang boxes accommodate multiple devices, with depth adjusted for cable and connector size .

Mounting and Installation

• Boxes are generally wall-mounted, with stainless steel backmount frames for support .
• Locking mechanisms and removable doors facilitate easy installation and maintenance.
• Earthing of protection components is required according to standard electrical safety guidelines .
• Mounting hardware is often not included, requiring separate procurement.

Accessories and Upgrades

• Compatible with a wide range of LSA-PLUS® accessories.
• Some configurations allow overvoltage protection modules to be added.
• Cable management features such as jumper rings and document storage are standard in most models .

Summary

Indoor distribution boxes are standardized to ensure safety, modularity, and ease of installation. Selection depends on:

• Number of pairs or modules required.
• Physical dimensions and available installation space.
• Material and IP rating for indoor environments.
• Compatibility with accessories and optional protection devices. These specifications help ensure compliance with electrical standards and facilitate organized, scalable installations in residential, commercial, or industrial settings .