The indoor metal enclosures are made from 11-gauge steel or aluminum. The outdoor metal enclosures are made from 11-gauge steel. Stainless steel housing is also available as an option. Enclosures are finished with a baked-on polyester powder coat paint that results in a uniform thickness and gloss, able to withstand harsh environments. The standard color is ANSI-61 gray. Special colors are available upon request.All enclosures have removable covers secured with bolts for easy access to the joints. Flexible joints are supplied in all straight bus runs at intervals of approximately 50’ (15.2 m) to allow for expansion when conductors are energized and carrying rated current.Bus runs can be terminated with flexible shunts, potheads, porcelain bushings or conductor stub ends for connection to riser bars in switchgear assemblies.
The standard length of a bus section is 120" (3,048 mm) or less. Compact dimensions and lightweight construction make the installation user-friendly. Hanging rods can be spaced approximately every 4’ (1.2 m) for indoor bus runs. Supporting frames can be spaced every 8’ (2.4 m) for outdoor runs.
All conductors are 99 percent plus conductivity copper bars. Silver-plated joint surfaces (tin-plated optional) ensure maximum conductivity while minimizing hot spots. Joints are made by bolting splice plates to either side of the bus bar. Each joint is covered by an easily removable insulating boot when conductors are insulated.
Siemens Power-Duct non-segregated phase bus duct meets IBC seismic requirements and California Code Title 24. Complete guidelines for proper supports are provided on each seismic specified order.
Siemens Power-Duct non-segregated phase bus duct can carry rated current continuously without exceeding a conductor temperature rise of 65 °C above an ambient temperature of 40 °C, as required by ANSI/IEEE C37.23.
Siemens designs of non-segregated phase bus duct have been tested to ANSI/IEEE C37.23 and witnessed by UL Laboratories, Inc. Certification of momentary current testing impulse testing and heat rise available upon request.