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Busway (Bus Duct)
4 Series · 27 Models
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Busway (Bus Duct) Overview
Busway (bus duct) systems distribute high-current power from transformers and switchgear to loads using compact, low-impedance busbar construction. QDTB offers dense (sandwich), air-insulated and fire-resistant busway rated 250–6300 A at 380/400/690 V, with copper or aluminum conductors and plug-in tap-off units, for data centers, industrial plants and commercial buildings.
Available Series
Dense Busway Series
Dense (sandwich-type) busway distributes high-current power from transformers and switchgear to loads with compact, low-impedance busbar construction. Rated 250–6300 A, 380V/400V/690V, with copper or aluminum conductors, insulated busbars in a compact housing, and plug-in tap-off units for flexible load connection in data centers and industrial plants.
Air-Insulated Busway Series
Air-insulated (air-type) busway uses busbars separated by air gaps within a ventilated or non-ventilated enclosure, providing high short-circuit withstand and ease of inspection. Rated 250–6300 A, 380/400/690V, suitable for industrial power distribution where ventilation and simple maintenance are preferred over compact dense construction.
Fire-Resistant Busway Series
Fire-resistant (fire-rated) busway maintains circuit integrity under fire for emergency power supply to fire pumps, smoke exhaust and life-safety loads. Rated 250–4000 A, 380/400V, with fire-resistant insulation and mineral/mica barriers, built to JB/T 10327 fire-resistant busway requirements for building emergency distribution.
HV Enclosed Busbar Series
High-voltage enclosed busbar (isolated phase bus duct) connects generators, transformers and switchgear at 10–35 kV, with each phase enclosed in its own grounded metal housing for safety and low field emissions. Rated 10–35 kV, 1000–8000 A, for power plants and large substations.
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Application Scenarios
Data Centers & Server Halls
High-current distribution with plug-in taps for server racks and power modules.
Industrial Plants
Feeds process lines and machinery with low voltage-drop busbar.
High-Rise Buildings
Vertical risers carrying power to floors and tenants.
Transformer-to-Switchgear Feeders
Connects transformers to low-voltage switchgear with minimal footprint.
Technical Advantages
Dense (Sandwich) Construction
Tightly stacked busbars for low impedance and low voltage drop.
Fire-Resistant Option
Mineral/mica barriers maintain circuit integrity under fire for life-safety loads.
Plug-In Tap-Off Units
Loads can be added or moved without de-energizing the main bus.
Copper or Aluminum
Conductor material selected for conductivity or cost.
FAQ - Busway (Bus Duct)
What is dense busway?
How are loads tapped from busway?
What is the typical current range?
What capacity and voltage range is available for Busway (Bus Duct)?
What is the minimum order quantity (MOQ) for Busway (Bus Duct)?
What is the delivery time for Busway (Bus Duct)?
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All specifications and dimensions can be customized upon request
Dense vs Air-Insulated vs Fire-Resistant Busway: How to Choose
| Dense Sandwich Busway | Air-Insulated Busway | Fire-Resistant Busway | |
|---|---|---|---|
| Construction | Phase conductors stacked with thin insulation between them | Bars held apart by air clearance inside a housing | Insulated bars in a fire-rated enclosure |
| Impedance | Lowest, because the phases sit close together | Higher, since the air gap sets the reactance | Between the two, set by the insulation system |
| Heat dissipation | Conductor heat passes through the sandwich to the housing | Air circulates around the bars | Limited by the fire-rated enclosure |
| Fire performance | Standard housing, protected by the building's own measures | Standard housing, with air as the dielectric | Rated to hold the circuit through a fire for a defined period |
| Tap-off | Plug-in units at fixed intervals | Plug-in or bolted tap-off units | Tap-off limited by the fire-rated construction |
| Cost | Highest per metre | Lowest per metre | Highest of the three, because of the enclosure |
| Typical application | Data centres and high-current risers | Industrial plants and long feeder runs | Life-safety circuits and evacuation routes |
Where QDTB® Busway Systems Are Specified
Busway is specified where a high current has to travel a long way through a building or a plant without a bundle of parallel cables: the feeder from a transformer to the main switchboard, the riser in a high-rise, and the overhead distribution in a data hall. The busbar replaces cable with a factory-built, low-impedance conductor that is faster to install and easier to extend.
Data centres and server halls choose dense busway because the tap-off units can be added or moved without rewiring the hall, which is what allows a row of racks to be re-laid out between equipment generations. Industrial plants use the same system for long feeder runs where a cable bundle would need a large tray and a grouping derating.
Fire-resistant busway is specified on life-safety circuits and evacuation routes, where the circuit has to keep working while the building is being evacuated. That duty is set by the fire-rated enclosure rather than by the conductor, so it is selected against the fire strategy and not against the load alone.
Systems are rated 250-6300 A at 380/400/690 V with copper or aluminium conductors, to IEC 61439-6. High-voltage enclosed busbar is available to IEC 62271-200 practice where the run leaves the low-voltage board.
Frequently Asked Questions
What is dense busway?
Dense (sandwich) busway stacks phase conductors with thin insulation for compact, low-impedance high-current distribution.
How are loads tapped from busway?
Plug-in tap-off units insert at intervals along the run, allowing loads to be added without de-energizing the bus.
What is the typical current range?
250–6300 A for low-voltage distribution, with higher ratings available on request.
What capacity and voltage range is available for Busway (Bus Duct)?
QDTB® supplies Busway (Bus Duct) from 250 to 6,300 A, with voltage ratings from 0.4 kV to 10 kV.
What is the minimum order quantity (MOQ) for Busway (Bus Duct)?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.
What is the delivery time for Busway (Bus Duct)?
Standard units are delivered in 30-45 days. Custom or large-capacity units follow a project-specific schedule confirmed at quotation. Rush orders can be accommodated for urgent projects.