Article Overview
Distribution boxes come in various sizes with standardized hole diameters (2”, 3”, 4”) and multiple outlet configurations, with dimensions depending on the model and material.
General Specifications
- Material: Most distribution boxes are made from high-density polyethylene (HDPE) or flame-resistant ABS plastic, ensuring durability, corrosion resistance, and insulation properties .
- Hole Sizes: Standard pipe entry holes are typically 2”, 3”, or 4” (50mm, 75mm, 110mm), compatible with twist-and-lock seals or plugs .
- Number of Outlets: Boxes range from 4-hole to 10-hole configurations, with some models offering pre-cut or uncut options for flexibility .
- Covers: Lockable pedestrian-rated covers are standard, often with riser compatibility for added height .
Dimensions Table (Representative Models)
| Model / Series | Length (mm) | Width (mm) | Height (mm) | Number of Holes / Outlets | Hole Diameter Options |
|---|---|---|---|---|---|
| MB-ABC500 | 200 | 174 | 95 | 4 | 2”, 3”, 4” |
| MB-ABC700 | 255 | 172 | 95 | 6 | 2”, 3”, 4” |
| MB-ABC900 | 328 | 172 | 95 | 7 | 2”, 3”, 4” |
| Polylok 4-Hole | 500 | 500 | 300 | 4 | 2”, 3”, 4” |
| Polylok 7-Hole | 500 | 500 | 300 | 7 | 2”, 3”, 4” |
| Polylok 10-Hole | 600 | 600 | 350 | 10 | 2”, 3”, 4” |
Installation Features
- Pipe Seals: Twist-and-lock seals for 4” pipes, adaptable for increased head installations with sealing compounds .
- Risers: Optional risers allow at-grade access and inspection, with anti-flotation adapters for stability .
- Busbar and Dropper Accommodation: For electrical distribution boxes, busbars and droppers are pre-drilled and insulated with PVC sleeves, maintaining phase separation and safety .
- Compliance: Boxes comply with relevant standards such as BS EN60439-3 for ABS units and local codes for HDPE boxes .
Notes
- Pre-cut boxes simplify installation, while uncut boxes allow custom hole placement.
- Hole spacing and layout vary by manufacturer; always refer to the specific product datasheet for exact measurements.
- For larger electrical distribution boxes (e.g., 63–315 kVA), hole and busbar dimensions are scaled to accommodate higher current ratings . This table and specifications provide a comprehensive reference for selecting and installing distribution boxes with the correct hole sizes, number of outlets, and overall dimensions.
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