Specifying a UL Listed alarm
installing company and a UL Listed central station is common
practice for many code authorities and system designers. Often,
these specifications are made without a clear understanding of
what "Listed" means. These frequently asked questions may help. 
What does "Listed" mean?UL's product safety certification programs are well known by many people. Under these programs, a company submits representative samples of a product. When UL finds that the samples comply with the applicable requirements, the manufacturer is authorized to use the Listing Mark on any products that continue to comply with requirements. Our follow-up inspection service is then initiated to countercheck actual, on-site production for compliance. The Listee's name (often, but not always the manufacturer) is also added to UL's product directories. Manufacturers are not obligated to use the Listing Mark on all products. Products that do not bear a UL Mark are not required by UL to comply with UL's requirements. Just because a product model number is listed under a company name in a directory does not imply that a specific device complies with UL's requirements. Only those products that bear a UL Mark are considered UL Listed. What does "Listed alarm service company" mean?"Listed alarm service company" is a common, short hand way of saying that a company is authorized to use the UL Mark on alarm services that are in compliance with UL's requirements. For alarm systems, the UL Mark is a Certificate. In other words, the alarm company has demonstrated its ability to provide Standards complying alarm service: installation as well as appropriate alarm response, service and testing. As a result, the company's name appears in UL's directories. What does "Listed central station" mean?"Listed central station" is a common way to refer to an alarm monitoring facility that has demonstrated the ability to provide Standards complying service. In the case of monitoring stations, UL requirements cover building structure, receiving and monitoring equipment, and staffing issues; in addition to installation and ongoing service. In order to be able to provide Standards complying service, the building, equipment and staffing requirements have to be met at all times. However, the handling of specific signals from specific alarm systems is only audited by UL if a Certificate is in effect for that alarm system. What does "Certificated alarm system" mean?A "Certificated alarm system" is one where the Certificate issuing alarm company declares that Standards complying alarm service is provided. It is equivalent to a manufacturer whose name appears in a UL product directory choosing to place a UL Mark on a specific production product. A Certificated alarm system is subject to random audit by UL alarm system auditors to countercheck compliance, just as a product with a UL Mark is subject to random audit. Do all alarms installed by a Listed company or monitored by a Listed central station comply with UL requirements?UL can only audit alarm systems for which Certificates have been issued. So, we can not answer this question with a definable level of certainty. Many non-Certificated systems may comply with requirements. Many do not. A non-Certificated alarm system is an unknown quantity to UL. The vast majority of alarm systems in the U.S. are not Certificated. Listed alarm companies are not required by UL to issue Certificates for any of the systems they install. Typically, a Certificate is issued only when a customer or authority having jurisdiction requests one. This means that the majority of alarm systems are designed and installed with a goal in mind, but not necessarily a vision commonly held by all parties. A system that has a Certificate complies with published, nationally recognized standards and codes that provide a baseline common understanding of the system and service provided. Does a Certificated alarm system cost more?While UL can not comment on pricing of alarm service, we often hear the statement that Certification increases costs. Many times, it is difficult to compare alarm systems and service because common elements may not be provided in the systems being considered. Elements that are generally considered minimum ingredients for reliable alarm service include:
If these elements are in place in two competing systems, the cost of a Certificated alarm system should be competitive with a similar non-Certificated system. Systems and service features being equal for any two competing alarm packages, the charge UL makes to an alarm company is between $20 and $60 per year. Often, jurisdictional authorities can influence total cost of ownership through choices of codes, standards, editions and local deviations. |