Length of distribution box equipment

The length of distribution boxes varies widely depending on type and capacity, typically ranging from 100 mm to over 860 mm.

Typical Lengths by Box Type

• Plastic modular boxes (HA, HK, LGD series): 100–415 mm in length, with widths of 105–323 mm and heights of 75–140 mm .
• MB-ABC series: MB-ABC500: 200 mm, MB-ABC700: 255 mm, MB-ABC900: 328 mm .
• Single-phase camera boxes: Two-element: 610 mm, Three-element: 850 mm, Four-element: 610 mm, Six-element: 860 mm .
• TOP series (TOP-TS, TOP-TF, TOP-LS, TOP-PS, TOP-PF, TOP-S): Lengths vary according to the number of ways (1-way to 36-ways), with specific dimensions provided in manufacturer catalogues .

Factors Affecting Length Selection

1. Number of outgoing circuits: More circuits require longer boxes to accommodate additional breakers or switches .
2. Incoming line size: Larger conductors or higher current ratings may require extra space, increasing box length .
3. Future expansion: Allowing spare ways for future circuits can influence the required length .
4. Internal layout: Busbars, neutral and earth bars, and DIN rail spacing affect the overall enclosure length .

Practical Considerations

• Always measure the actual switch or breaker width and add clearance for wiring and heat dissipation when determining the box length .
• For embedded or wall-mounted boxes, consider the installation space and mounting requirements to ensure proper fit .
• Refer to manufacturer specifications for exact dimensions, as length can vary significantly between series and models . By considering these factors, you can select a distribution box with an appropriate length that ensures safe, efficient, and expandable electrical distribution.