busbartrunking

Busbar trunking, also known as busbar trunking systems (BTS), is a prefabricated electrical distribution method that uses conductive bars housed within a sealed or semi-sealed enclosure to distribute power from a source to multiple outputs. The system provides a modular alternative to conventional cable busbar installations, combining busbars, insulation, and protective enclosures in factory-made lengths and configurations.

A BTS typically consists of busbars made of copper or aluminum, insulation to prevent short circuits, an enclosure or tray to protect against accidental contact, and connection accessories such as endplates, tap-offs, and joints. Variants include floor-mounted, wall-mounted, or ceiling-mounted installations, with options for indoor or outdoor use and various enclosure protections (solid-wall or open/tray designs). The trunking can be designed for different voltage and current ratings and often incorporates thermal management, protective devices, and monitoring provisions.

Key advantages include faster installation, reduced cable clutter, improved workplace safety, contained fault energy and fire performance, and easier future expansion or reconfiguration. BTS is commonly used in industrial plants, data centers, commercial buildings, hospitals, and airports where high power distribution with modularity and reliability is required.

Design and planning considerations cover current rating, voltage, short-circuit withstand capability, insulation coordination, ambient temperature, IP and fire performance ratings, thermal management, grounding and bonding, and accessibility for maintenance. Installation typically emphasizes precise alignment, proper termination of joints, and adherence to applicable standards and local codes. Standards commonly referenced for low-voltage BTS include IEC/EN 61439 family and related product standards, with regional certifications such as UL in North America.