Fiberglass Cable Tray & Channel
Standards
Tray Splice Joint Locations vs. Support Locations In a continuous beam configuration, the bending moment in the tray side rails becomes zero at points located approximately 1⁄4 of the span from each tray support (referred to as quarter span points or just quarter points). For example, if the support span is 10', the quarter point is 2.5' from the support. Quarter points are ideal locations for spliced tray connections because joints are subjected to minimum bending stresses (see diagram below).
Fiberglass is used because of its superior corrosion resistance; therefore, corrosion resistance data for specific environments are very important. The corrosion resistance guide in the Application Environments Section offers performance data in the most common environments. If information for a specific environment is not shown in the guide, please consult the factory. Installation/Application Guidance for cable tray installation, supports and support locations, and thermal expansion/ contraction is provided in NEMA FG 1. The installation instructions for supports and support locations contained in the Installation Procedures Section of this catalog are based on the Application Information Section of NEMA FG 1.
Effect of Temperature
Approximate % of Strength
Temp. in °F
Polyester Resin
Vinyl Ester Resin
75°
100
100 100 100
Effect of Temperature When continuously exposed to elevated temperatures, the strength properties of reinforced fiberglass are reduced. Working loads shall be reduced based on the following table.
100° 125° 150° 175°
90 78 68 60
90 90
200° 75 Note: Consult the manufacturer when temperatures above 200° F are encountered. Fiberglass Cable Tray is not adversely affected by below freezing temperatures. 52
Chemical Resistance
GLAS - Standards
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