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Cable Tray Design Guide

Cable Tray Manual- Based on the 2014 National Electrical Code. 


Thihs manual is a complete cable tray reference source for electrical engineers and designers.

It has been developed in line with the  2014 National Electrical Code requirements for cable tray systems as well as design solutions from practical experience.

The information has been organized for use as a reference guide for both those unfamiliar and those experienced with cable tray.

Nearly every aspect of cable tray design and installation has been explored for the use of thereader.


Cable Tray



Large numbers of electrical engineers have limited detail knowledge concerning wiring systems. There is the tendency by engineers to avoid becoming involved in the details of wiring systems, leaving the wiring system selection and design to designers or contractors.

Certain decisions must be made for any wiring system installation, and these decisions should be made in the design and construction activities' chain where maximum impact is achieved at the lowest possible cost. Deferring design decisions to construction can result in increased costs and wiring systems  incompatible with the owner's future requirements.

Early in the project's design life, the costs and features of various applicable wiring systems should be objectively evaluated in detail. Unfortunately, such evaluations are often not made
because of the time and money involved. It is important to realize that these initial evaluations are important and will save time and money in the long run.

The evaluation should include the safety, dependability, space and cost requirements of the project. Many industrial and commercial electrical wiring systems have excessive  initial capital costs,unnecessary power outages and require excessive maintenance. Moreover, the wiring system may not have the features to easily accommodate system changes and expansions, or provide the maximum degree of safety for the personnel and the facilities.

Cable tray wiring systems are the preferred wiring system when they are evaluated against equivalent conduit wiring systems in terms of safety,   dependability, space and cost. To properly evaluate a cable tray wiring system vs. a conduit wiring system, an engineer must be knowledgeable of both their installation and the system features. The advantages of cable tray installations are listed below and explained in the design guide .

• Safety Features
• Dependability
• Space Savings
• Cost Savings
• Design Cost Savings
• Material Cost Savings
• Installation Cost & Time Savings
• Maintenance Savings


This article was extracted from the  "2014 Cable Tray Manual " by Eaton

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