The "AL" specification denotes a standard type of distribution box used for general electrical distribution purposes.

Meaning of AL Specification

In distribution box coding, AL refers to a distribution box designed for general power distribution applications . This coding system is commonly used by designers and manufacturers to categorize boxes based on their function, installation type, and position within a building or electrical system. For example, AL boxes are typically used for standard distribution of electrical circuits, whereas other codes like AP indicate power distribution boxes and KX indicates control boxes .

Typical Features

• Material: AL distribution boxes can be made from metal or flame-retardant plastic, depending on the manufacturer and application .
• Installation: They can be surface-mounted or flush-mounted, allowing flexibility in building design .
• Protection: These boxes often include protective devices, DIN rails for mounting circuit breakers, and terminal strips for neutral and earth connections .
• Phase Busbars: In larger AL boxes, busbars and droppers may be made of aluminum, with proper insulation and phase coding for safety .

Applications

• Residential and commercial buildings: For distributing electrical circuits to different flats or rooms.
• Industrial sites: As part of low-voltage power distribution systems.
• Positioning: AL boxes can be labeled with codes indicating their floor and position, e.g., 1AL1b for a Type B distribution box on the first floor .

Summary

The AL specification identifies a general-purpose distribution box suitable for standard electrical distribution, offering flexibility in installation, material choice, and safety features. It is part of a broader coding system that helps engineers and electricians select the appropriate box for specific applications .