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Failure of a Required Smoke or Fire Detection System <br />A failure of the smoke detector will activate a trouble signal at the Network Operations <br />Center (NOC),alerting system owner to a fault of the monitoring system. <br />Table 5 –Failure of Smoke Detection /Fire Detection System Barriers <br />Barrier Barrier Description <br />CONSEQUENCE BARRIERS <br />Battery Management <br />System (BMS) <br />Even while the smoke detector is inoperable the BMS <br />will provide sensing and control of critical parameters <br />and triggers protective or corrective actions if the <br />system is operating out of normal parameters.This was <br />demonstrated in UL 1973 testing. <br />Cascading Thermal Runaway <br />Limitation <br />Although the smoke detector is inoperable,cell and <br />module designs prevent cascading thermal runaway <br />beyond the initiating module as demonstrated in UL <br />9540A testing. <br />Deflagration Protection Even while the smoke detector is inoperable UL 9540A <br />testing has demonstrated that generation of a <br />combustible mixture of vented gasses is not likely in <br />accordance with NFPA68/69.The B160 enclosure <br />contains a panel of pressure relief valves and fans to <br />release vented gas pressure in the event of venting of a <br />cell or cells. <br />Emergency Response Plan Training In many cases,an Emergency Response Plan will be in <br />place to provide direction to building personnel or <br />responders on how to safely evacuate a site in the event <br />of a thermal runaway event.Such a plan is valuable if <br />fire is detected by means other than the in-cabinet <br />detection.To be added by customer. <br />Fire Service Response Although the smoke detector may be inoperable and <br />prevent an early indication of fire event,a fire can be <br />detected by an alarm from the BMS to the NOC due to a <br />high temperature measurement of the battery cells. <br />Initiation of a Fire service response to a high <br />temperature alarm by the NOC is beneficial.As the <br />installation locations of cellular communications <br />equipment are generally in populated areas,timely <br />response and site access by fire services are anticipated. <br />Confidentiality Class External Confidentiality Label Document Type Page <br />Ericsson Internal Analysis 20 (27) <br />Prepared By (Subject Responsible)Approved By (Document Responsible)Checked <br />ERATLEN Thomas Lennholm <br />Document Number Revision Date Reference <br />1785-BFM 107 220/1 Uen PA2 2025-06-03