Underwriters Laboratories Inc. has concluded its investigation of UL Product Incident Report 2019MS-940, which was requested by Jeffrey Zwirn, president of IDS Research & Development. Zwirn requested the investigation after noticing that if the data-bus circuit of certain alarm panels is damaged in any way, the alarm system is unable to communicate the alarm condition to the central monitoring station or audibly alert those within the property of life safety dangers such as smoke and carbon monoxide, or intrusion.
Zwirn believed this defect made the alarm panels non-compliant with UL 985 and UL 1023, along with NFPA 72. He reached out to UL seeking a recall of these alarm panels on April 30, 2019, and received notice from UL that the investigation was closed on Dec. 11, 2019.