Specifications of UAE Tunnel Distribution Boxes

UAE tunnel distribution boxes are heavy-duty, high-performance electrical enclosures designed for harsh tunnel environments, supporting voltages up to 3300 V and complying with BS6164 and local safety standards.

Construction and Materials

Tunnel distribution boxes are typically fabricated from heavy-duty steel casings to withstand dust, water, and concrete casting during tunnel construction . For general UAE distribution boxes, materials include high-impact carbon steel, stainless steel, or thermoplastic, often treated with powder coating or passivation for corrosion resistance in humid or corrosive environments . Outdoor LT distribution boxes are made from 2 mm GI sheet steel with reinforced channels and slanted roofs to prevent water accumulation .

Protection and Safety Features

• Ingress Protection: IP55 or higher for outdoor and tunnel applications, ensuring dust and water resistance .
• Locking Mechanisms: Godrej-type 3-position locks with galvanized manual locking provisions to prevent rusting .
• Earthing: Solid earthing points on either side of the box for safety .
• Circuit Protection: Includes fuses, MCCBs, and transformers with individual protection for each output .
• Insulation: Metallic or heat-resistant insulating barriers between MCCBs to prevent heat damage during faults .

Electrical Specifications

• Voltage Handling: Standard tunnel boxes can step up voltage to 3300 V at tunnel entrances and step down to 400 V, 230 V, or 110 V at intervals .
• Bus Bars: Copper flat bus bars (e.g., 25x4 mm) with phase-colored insulation or paint for easy identification .
• Outputs: Single-phase 110 V for lighting and small power, dual outputs for 400 V machinery and 110 V lighting .
• Cable Glands: Heavy-duty, double compression brass glands for incoming and outgoing cables .

Design and Installation Features

• Modular Design: Supports DIN-rail mounting for MCBs, RCDs, and surge protectors .
• Lighting and Identification: Provision for internal lighting and non-detachable nameplates for identification .
• Expandable System: “Half Coupler” transformers with plug-and-socket interlocks allow rapid expansion as tunneling progresses .
• Compliance: Conforms to BS6164, IS 13947, and local UAE electrical standards .

Applications

• Tunnel Construction: Temporary and permanent power distribution for lighting, machinery, and safety systems .
• Industrial and Commercial: Centralized control for automated systems, HVAC, and renewable energy integration .
• Telecommunications: Power supply for remote base stations and data hubs .

These specifications ensure that UAE tunnel distribution boxes provide robust, safe, and reliable power distribution in challenging underground environments while meeting international and local regulatory standards.