Comoros Tunnel Distribution Box Specifications

Comoros Tunnel Distribution Boxes are designed for robust electrical distribution in tunnels, featuring heavy-duty steel enclosures, modular components, and compliance with international safety standards.

Overview

Comoros Tunnel Distribution Boxes (TDLBs) provide a complete solution for temporary or permanent electrical installations in tunnels, ensuring safety, reliability, and ease of maintenance. They are suitable for harsh environments, including dust, water, and concrete casting conditions, and are designed to comply with standards such as BS6164 for tunnel electrical systems .

Key Models and Types

1. XL-21 Low-Voltage Power Distribution Cabinet
   • Structure: Indoor, wall-mounted, single-sided front-opening; made of bent steel plates and welded angle steel .
   • Protection: IP30 enclosure; grounding screws on door and enclosure.
   • Voltage & Current Ratings: Rated main circuit voltage AC 380V, insulation voltage AC 660V, rated current ≤800A; auxiliary circuits AC 220V/380V.
   • Components: Air circuit breakers, fuses, contactors, thermal relays; optional knife switch with front handle.
   • Applications: Industrial, mining, civil buildings, schools, government institutions; supports single-phase and three-phase systems (50–60Hz).
   • Operating Environment: -5°C to +40°C, altitude ≤2000m, relative humidity ≤50% at 40°C (higher allowed at lower temperatures), tilt ≤5° .
2. Box-Type Substation
   • Structure: Outdoor, fabricated from 2 mm GI sheet steel with reinforced channels; slanted roof with overhang for water protection .
   • Protection: IP55; solid earthing points; metallic/heat-resistant insulating barriers between MCCBs.
   • Components: Bus bars, 4-pole MCCBs, outgoing feeders with 3-pole MCCBs, cable glands, and phase-colored insulation.
   • Standards: IS 13947, IEC rules for LT supply; type-tested at approved laboratories.
3. Tunnel Distribution & Lighting Box (TDLB)
   • Purpose: Temporary or permanent tunnel electrical supply, including lighting and machinery power .
   • Voltage Handling: Step-up to 3300V at tunnel entrance, step-down to 400V/230V/110V at intervals.
   • Components: Transformers with single or dual outputs, circuit breakers, fuses, and plug-and-socket “Half Couplers” for modular expansion.
   • Construction: Heavy-duty steel casing, high-quality internal components for continuity of service.
   • Applications: Long tunnels requiring distributed power and lighting, ensuring operator safety and compliance with health regulations.

Additional Features

• Maintenance: Front doors allow full access to internal equipment; operation buttons, indicator lights, and display instruments can be mounted on the door .
• Flexibility: Modular design allows combination of circuit schemes, easy expansion, and integration with auxiliary devices.
• Safety: Grounding, fuses, and circuit breakers ensure protection against short circuits and overloads; compliance with IEC 60439-1, GB7251.1, and BS6164 standards .

Summary

Comoros Tunnel Distribution Boxes are available in multiple models, including XL-21 low-voltage cabinets, box-type substations, and tunnel-specific TDLBs, each designed for specific voltage, current, and environmental requirements. They combine robust construction, modularity, and compliance with international standards, making them suitable for industrial, civil, and tunnel applications where reliable power distribution and safety are critical .