New standard establishes a common platform that allows increased cost-effective retrofit flexibility. The Underwriters Laboratories’ new edition of the fire alarm controls standard may prove to be one of the most significant changes the fire- and life-safety industry has seen in the past 20 years. “The 9th edition of UL864 is bordering more on revolutionary [...]
Archive for the ‘ UL ’ Category
New standards cut back system failure risks. In May 2004, Underwriters Laboratories (UL) revised UL 1971, regulating how operating currents are to be measured and how voltage ranges are to be listed and published. Historically, fire-alarm system designers used 24-volt current draw for computing voltage drops on audible and visible (AV) circuits. However, voltage drops [...]
Are You Installing the Right Carbon Monoxide Detector?
When security dealers, installers and distributors are evaluating which carbon monoxide (CO) detector to purchase, they should look for a product that is listed for the intended use and features that comply with the industry’s most recent product standards. Every alarm professional should understand the differences between American National Standards Institute (ANSI) and Underwriters Laboratories (UL) standards ANSI/UL 2034 and ANSI/UL 2075 and be aware of the new requirements of the third edition of ANSI/UL 2075 that become effective later in 2009.
All system-connected Carbon Monoxide (CO) detectors contain a limited-life gas sensor. Underwriters Laboratories (UL) mandates the detector to electronically supervise the sensor so that when the sensor reaches its end-of-life, the detector will send a trouble signal to the control panel. Some security dealers, installers, distributors and authorities having jurisdiction in the life-safety community are not familiar with all the requirements for CO detection. As a result, many installed system-connected CO detectors are not code compliant. The following defines the limited-life sensor of system-connected CO detection devices and outlines UL’s requirements for supervising the sensor.