Under normal circumstances, the distance between the support arms of the cable tray should be about 1. 5 m – 3 m, and should be verified according to specific conditions. These regulations ensure that the metal or plastic frames that contain the wires are robust enough to ensure. The safety of your people and the reliability of your electrical system depend on proper cable tray support spacing. In this blog, we'll focus on support spacing for perforated, ladder and wire mesh cable trays and reference the National Electrical Code (NEC). Cable trays are used for supporting. When cable trays are installed at a higher position from indoors to outdoors, the cable tray should first be extended downward at an appropriate distance before being set up upward to prevent rainwater from flowing into the interior along the cable tray. Cables must be rated for the environmental conditions (temperature, UV exposure, moisture, chemicals) and for the flame spread and smoke performance required in the installation.
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