When would you specify busway instead of cable distribution?

Busway (bus duct) is preferred for high-capacity vertical risers in multi-story buildings, flexible power distribution in manufacturing with frequent load changes, and visible neat installations. Advantages include higher ampacity in smaller space, easy tap-off for loads, lower installation labor, and better heat dissipation. Disadvantages are higher material cost and less flexibility in routing. Busway types include feeder (no tap-offs), plug-in (factory tap-off points), and lighting track. IP ratings determine suitability for different environments.