Article 760 Fire Alarm Systems

This article was posted 01/19/2010 and is most likely outdated.

Topic - NEC
Subject - Article 760 Fire Alarm Systems

January 19, 2010
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Article 760 – Fire Alarm Systems

We at Mike Holt Enterprises try to provide as much as we can to the industry at no charge. For this reason we’ve created a free Fire Alarm Systems booklet.

The material in this booklet was extracted from Mike's Understanding the 2008 NEC, Volume 2 textbook.

Click here or on the image to download the pdf file. Please note that the file is 1.85MB and may take a few minutes to download depending on your internet connection speed. If you encounter a problem opening this file, be sure you have the latest version of Adobe Acrobat installed on your system (click here).

To purchase your copy of Mike Holt’s Illustrated Guide to Understanding the National Electrical Code Volume 2, 2008 Edition, please click here or call our office at 888.NEC.CODE(632.2633) for more information.

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Comments

"Author’s Comment: Cables identified as suitable for plenum use can be installed in environmental air spaces, but they are not permitted to be installed in ducts or plenums! See 760.3(B) in this textbook for details."

THis statement is repeated in the illustration adjacent. Uh, it doesn't make any sense. If a cable is listed for installation in a plenum, then it should be allowed in a plenum! Why does the author make this statement? Since it was said twice, I assume there is some truth to it and it isn't a typo. What is the explanation?

Lawrence Lile

Reply from: Mike Holt
Plenum listed cable is not permitted to be installed in Plenum areas as defined by the NEC (basically inside any duct work), but it's permitted above the suspended ceiling used for enviromental air (what some call plenum space). See 760.3(B) in the document and the graphics related to 706.3(B).

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