Never locate ducts at the end of the trunk line run. Heat conduction and thermal resistance for steady state conditions and one dimensional heat transfer, the heat q conducted through a plane wall is given by. Dampers on takeoff duct runs allow for adjustments of air distribution. Bus duct withstand voltage test iec, nec, nema, fdf, iso ansi, ci, ipcea iec, nec, nema, fdf, iso ansi, ci, ipcea procedure h r a 9 painting procedure sspc sspc procedure h r a. Our companys brand new product, the qbd bus duct consists of copper conductors encased in steel. This type of duct is used primarily for the outlet of generator outputs at current levels as. Spectra and spectra ii series plugin and feeder busway installing spectra series busway 4 obstructions where a busway run must pass through a wall or floor, an opening one inch larger than the busway. Here you can view and download pdf versions of our bus duct catalogues. Pdf viewing software is required to view these files. This bulletin is an update and revision of previous rea bulletin 651, design guide for rural substations revised june 1978. Calculate the pressure loss of the duct fitting in a 600mm w x 200mm h duct with a radius of 600mm and a 90 bend angle. It can be made to handle large capacity of electric power.
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