The purpose of a cable tray system is to support, route, and protect cable as part of the cable management system. Through NEMA and the Cable Tray Institute numerous articles, standards, and other general guidance can be found regarding the proper us[……]
In addition to simply routing and protecting cables a cable tray system must provide protection to life and property against faults caused by electrical disturbances, lightening, failures which are part of the system, and failures of equipment that i[……]
National Electrical Code (NEC) Section 318-11 Ampacities of Cables, Rated 2000 Volts or Less, in Cable Trays. (b) Single Conductor Cables allows cables of identical construction and conductor material to be operated at different maximum ampacities de[……]
One of the most important choices when designing a cable tray system for corrosive or outdoor environments is the material. Steel cable tray with a Hot-Dip Galvanized after Fabrication (ASTM A123) finish has been used successfully for many years. Inc[……]
It is essential that the grounding of cable tray systems, including the cables in the tray systems, is inspected for compliance with the grounding requirements in the National Electrical Code (NEC) BEFORE the cabling in the tray is energized and BEFO[……]
Cable tray wiring systems have excellent safety and dependability records. These excellent records are the result of cable tray’s unique features plus the proper design and installation of the cable tray wiring systems. The intent of this article is[……]
The objective of this article to provide clear information as to the use of cable tray in those areas covered by Section 300-22 of the 1996 National Electrical Code.
Section 318-4 Uses Not Permitted states that “Cable tray systems shall not be use[……]
Cost is usually a major consideration in the selection of a wiring system. This article provides information as to where cable tray wiring system cost savings will occur; however, it is not the intent of this article to state that the selection of a[……]
It is not necessary to install bonding jumpers in parallel with the standard rigid aluminum or steel one-piece metallic bolted side rail splice plates that are the connections between the cable tray sections. Here, the use of bonding jumpers does not[……]
Improperly secured covers on outdoor cable trays can cause a serious safety hazard in high winds. In the majority of cases, covers are not used on cable trays for technical or safety reasons, but due to the “raceway complex,” a feeling by specifiers[……]