Busway

Imagine wiring an entire warehouse of equipment not by running one dedicated cable to every single point that needs power, but by installing one continuous, pre-engineered rigid track of enclosed copper or aluminium conductors down the length of an aisle, and letting individual pieces of equipment simply plug into it wherever needed, much like a long power strip built directly into the ceiling. That prefabricated track is busway, sometimes called bus duct or busbar trunking, an alternative to point-to-point cable, covered elsewhere on this site, for distributing power inside a building.

Data centre operators favour busway specifically because facility layouts and rack power requirements keep changing, particularly as denser AI hardware and liquid cooling, both covered elsewhere on this site, push power draw per rack sharply upward, and busway's pluggable tap-off boxes let an operator add, move or resize a rack's power connection in a fraction of the time it would take to run and terminate a fresh cable for the same change.

This flexibility matters more with every generation of AI hardware, a facility designed for one rack power density can find itself needing to reconfigure for a meaningfully higher density within just a few years as GPU platforms evolve, and busway's ability to accommodate that kind of change without ripping open walls or re-pulling cable is precisely why it has become a standard feature of hyperscale and colocation electrical design rather than a niche choice.