Issuing body: NEMA
NEMA BU 1 / BU 1.1
Busways — product and installation
NEMA BU 1 is the busway product standard; NEMA BU 1.1 gives general instructions for handling, installation, operation and maintenance of busway rated 600 V or less. BU 1.1 covers enclosed, sectionalised, prefabricated busbars rated 100 A and above together with their structures and fittings, classified as feeder busway for indoor or outdoor use, plug-in busway for indoor use, and accessories. It explicitly does not cover metal-enclosed busways addressed by ANSI/IEEE C37.23.
BU 1.1's handling guidance is worth reading on the fabrication side too — much of the damage it warns about is introduced before the busway leaves the factory.
Technical background
Processes