Low-voltage busbar trunking supply

Low-voltage busbar trunking systems (BTS) are prefabricated, modular power distribution assemblies designed for efficient, flexible, and safe electrical distribution in commercial, industrial, and utility applications.

Overview and Applications

Low-voltage busbar trunking systems are modular assemblies that replace conventional cable risers and distribution cabling, providing a compact and extendable solution for power distribution. They are commonly used in:

• Office buildings and apartment blocks for rising mains and floor distribution
• Factories, data centers, airports, and hospitals for high-current distribution
• Interconnection between switchboards, transformers, and sub-distribution systems Busbar trunking can be installed vertically, horizontally, or in combination, and power is drawn via tap-off units at defined positions along the trunking, typically protected by overcurrent devices .

Types and Construction

Busbar trunking systems are available in two main types:

• Sandwich (enclosed) type: Compact footprint, high current density, better electromagnetic performance, ideal for crowded ceilings, risers, and data centers
• Air-insulated type: Easier visual inspection, lower cost, simpler maintenance, suitable for less congested installations Conductors are usually aluminum or copper, with current ratings ranging from 25 A for lighting trunking up to 6300 A for high-current feeders. Systems are engineered to meet short-circuit withstand ratings coordinated with upstream protection devices like MCCBs or ACBs .

Advantages Over Conventional Cabling

• Reduced installation time and fewer fixings per meter compared to multiple cable runs
• Flexibility: Tap-off units can be repositioned or added to accommodate changing power requirements
• Extendable system: Easy to expand for future load increases
• Engineered and verified: Compliant with BS EN 61439-6 / IEC 61439-6 standards, ensuring safety and performance
• Cost savings: Less material and labor compared to traditional cable trays and multiple cable runs

Planning and Digital Tools

Modern busbar systems, such as Siemens SIVACON 8PS, integrate with digital planning tools like SIMARIS, allowing:

• BIM-based digital twins for design and installation
• Energy data integration with automation and IoT systems
• Flexible tap-off placement and project-specific configuration

Supply Considerations

When sourcing low-voltage busbar trunking systems:

• Verify current rating, short-circuit withstand, and IP rating for your application
• Choose the appropriate construction type (sandwich vs air-insulated) based on space, maintenance, and cost
• Ensure compliance with IEC/BS EN standards for safety and performance
• Consider manufacturer support and planning tools for installation, testing, and future expansion Busbar trunking systems are widely available from major manufacturers and distributors, offering a range of modular components including straight lengths, elbows, tees, reducers, end feeds, tap-off boxes, and expansion sections, allowing tailored solutions for any low-voltage power distribution project .