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12/01/2007
OSHA Relations Committee Update
I've been a member of the NATE OSHA Relations Committee for approximately one year. During this period, I've been privileged to work with some of the most experienced and talented members of the tower industry. Their dedication to safety and ability to describe and communicate issues continually motivates me to learn more and keep abreast of the latest trends in the field. It also reminds me that anyone can increase their knowledge by listening and asking questions.
Over the last several years, a number of telecommunication infrastructure companies have formed, merged, or discontinued operations. As the industry continues to evolve, there are several new players and therefore, many inexperienced members. This means that the guidelines and educational opportunities provided by NATE and OSHA are especially important.
In the February 2007 issue of Tower Times, Brandon Chapman wrote an excellent article clarifying the term “man rating” as it relates to antenna mounts. This article hit home for me because I receive frequent inquires about what a mount can “handle” or what its rating is. At this point, it's important to educate the individual by explaining the process used to develop a safe application.
What a mount can “handle” depends on several factors. They include: elevation above ground level, the number and size of antennas per sector, and geographic location of the tower to determine maximum wind loading per TIA-222-G standards. Other factors such as the type of tower, desired mounting position, and azimuth requirements also affect the choices available for the type of antenna mount.
If the tower is a monopole, the diameter of the mounting elevation may be critical. If the diameter is small, a greater standoff distance of the T-arms may be required so each sector does not interfere with another. On a self support tower, the taper needs to be accounted for, as well as the size and type of tower leg. Round or angle members provide different options for mount attachment. Water towers and roof tops can be just as complex and require some analysis of the total system. Often the individual is not fully aware of the considerations required for their application and will call back after they gather information.
Once the application information is known, it's possible to help them select the most suitable mount. In the process, the customer has learned to appreciate the engineering that is behind every component. They will be more prepared next time they select antenna mounts for their site. Awareness of the factors involved helps ensure that the safest mount for the application is selected. So please ask questions, read and understand the latest standards, and continue to learn from your more experienced peers.
Tom Palmer is a member of the NATE OSHA Relations Committee. He is the Engineering Manager - Accessories & Steel Products for Andrew Corporation in Cheshire, Connecticut. He can be reached at 203-699-4118 or tom.palmer@andrew.com
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