Raceways are channels constructed to house and protect electrical conductors—wire. This chapter contains descriptions of 11 different types of raceway, fittings, and associated installation activities. The appropriate units for measure are provided for each of these components, along with material and labor requirements and a step-by-step takeoff procedure. Cost modification factors are given when economy of scale or difficult working conditions may affect the cost of the project. The variety of raceways discussed here are typically specified in CSI MasterFormat Division 26—Electrical, section 26 05 33, Raceway and Boxes for Electrical Systems.
CABLE TRAY
A cable tray system is a prefabricated metal raceway structure consisting of lengths of tray and associated fittings (see Figure 12.1). Together, these components form a continuous, rigid, open support surface for cables. Cable tray is usually made of aluminum or galvanized steel, but is also available in polyvinyl chloride (PVC)-coated steel, fiberglass, and stainless steel.
Source: RSMeans Estimating Handbook, Third Edition, Wiley.
There are three basic types of tray: ladder, trough, and solid bottom. Trays have an overall nominal depth of 4″ through 7″ and are supplied in standard lengths of 12′ and 24′. Standard widths are 6″, 9″, 12″, 18″, 24″, 30″, and 36″.
Fittings ...
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