Dimensions of Pole-Mounted Distribution Boxes

Pole-mounted distribution boxes typically range in width from 250 mm to 400 mm, with heights and depths varying according to the number of circuit breakers and enclosure type.

Typical Dimensions

Pole-mounted distribution boxes are designed to house circuit breakers and protect overhead or underground service cables. Common dimensions include:

• Width: Approximately 250 mm to 400 mm depending on the model and number of poles accommodated (e.g., SPB1 series) .
• Height: Varies with the number of breakers; single-phase boxes are smaller, while three-phase boxes can be taller to accommodate multiple breakers .
• Depth: Typically ranges from 150 mm to 250 mm to allow sufficient wiring space and clearance for busbars and terminals .

Material and Protection

• Enclosures are often made from UV-resistant polypropylene or ASA (Acrylic Styrene Acrylonitrile) for durability and weather resistance .
• Protection ratings commonly range from IP44 to IP55, ensuring resistance to dust and water ingress .

Mounting Considerations

• Boxes can be mounted on poles, cross arms, or under porcelain insulators depending on the installation site .
• Some models include horizontal brackets for cross-arm mounting and slide mechanisms for external operation of breakers without climbing the pole .
• Adjustable studs and nuts are often provided for easy installation and removal of the internal pan assembly .

Additional Features

• Designed to accommodate single, double, or triple pole circuit breakers .
• Provision for incoming and outgoing cable glands, neutral and earth connections, and optional internal lighting .
• Some enclosures include transparent indicators or slides to show breaker status externally . In summary, while exact dimensions depend on the manufacturer and model, pole-mounted distribution boxes are generally compact, weather-resistant enclosures with widths around 250–400 mm, sufficient height and depth for multiple breakers, and flexible mounting options for safe and convenient installation.