Comoros Tunnel Distribution Box Specifications and Models

Comoros Tunnel Distribution Boxes are designed for harsh tunnel environments, featuring heavy-duty steel enclosures, IP55 protection, integrated transformers, and compliance with BS6164 and EN standards.General Design and EnclosureComoros Tunnel Distribution Boxes are typically fabricated from heavy-duty steel or galvanized iron sheets to withstand dust, water, and concrete casting conditions in tunnels . The enclosures are reinforced with channels for structural integrity, and the roof is slightly slanted with overhangs to prevent water ingress . Doors are equipped with secure locking systems (e.g., Godrej 3-position locks) and concealed hinges, while earthing points are provided on both sides to ensure safety . The boxes are designed to meet IP55 protection standards, ensuring resistance to dust and water .Electrical Components and Voltage RatingsThese distribution boxes can handle low-voltage (400 V / 230 V / 110 V) and, for longer tunnels, stepped-up voltage up to 3300 V at the entrance, with step-down transformers installed at intervals . The boxes may include:Circuit breakers (MCCBs) with magnetic trip release and manual resetTransformers with single-phase 110 V output for lighting or dual output for machinery and lightingBus bars made of copper, insulated or color-coded for phasesFuses for individual transformer protectionCable glands for incoming and outgoing cables, often heavy-duty and double compression type Standards and ComplianceThe boxes are designed in accordance with BS6164 for tunnel electrical installations and may also comply with EN regulations for low-voltage distribution . Type-test certificates for IP protection and MCCB compliance are typically required from accredited laboratories such as CPRI or other government-approved facilities . Internal components are selected to ensure continuity of service, operator safety, and compliance with health and safety regulations.Modular and Installation FeaturesFor tunnels requiring extended electrical distribution, the boxes can be electrically interlocked using plug-and-socket mechanisms, allowing rapid expansion as tunneling progresses . Transformers can be configured for dual outputs to supply both machinery and lighting, and the boxes are designed for easy integration of internal transformers if required . Cable entry points are provided at the bottom with detachable plates for secure installation.SummaryComoros Tunnel Distribution Boxes are robust, modular, and compliant with international standards, featuring:Heavy-duty steel or GI sheet enclosures with IP55 protectionIntegrated transformers for stepped-down voltageCircuit breakers, bus bars, and fuses for electrical safetyModular plug-and-socket interlocks for tunnel expansionCompliance with BS6164, EN regulations, and type-tested components These specifications ensure reliable and safe electrical distribution in tunnel construction projects.