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2.1.4.5 Hazard Event 5:Communication Failure <br />Table 7 –Failure of the Enclosure B160 Communication System Barriers <br />Fire Service Response In the event of fire,fire service response is beneficial. <br />As the installation locations of cellular <br />communications equipment are generally in <br />populated areas,timely response and site access by <br />fire services are anticipated. <br />Barrier Barrier Description <br />THREAT BARRIERS <br />Battery Management Systems <br />(BMS) <br />BMS provides supervisory actions and isolation / <br />protective actions.If the C6610 loses <br />communication to BMS the C6610 will raise alarm to <br />the NOC and set charging to 0.1 C from rectifiers. <br />Cell Electrical Abuse Tolerance The cells were tested and certified to UL 1973.Cells <br />and modules were tested to UL 9540A and did not <br />propagate fire outside the initiating module. <br />CONSEQUENCE BARRIERS <br />Cascading Thermal Runaway <br />Limitation <br />Cell and module designs prevent cascading thermal <br />runaway beyond the initiating module as <br />demonstrated in UL 9540A testing. <br />Fire Detection A smoke detector is included in the B160 cabinet. <br />In the event of a fire within the battery or other <br />electronics the detector will send an alarm signal to <br />a remote 24/7 Network Operations Center (NOC), <br />alerting the system owner of a potential fire within <br />the enclosure. <br />Deflagration Protection UL 9540A testing has demonstrated that <br />generation of a combustible mixture of vented <br />gasses is not likely in accordance with NFPA68/69. <br />The B160 enclosure contains a panel of pressure <br />relief valves and fans to release vented gas <br />pressure in the event of venting of a cell or cells. <br />Emergency Response Plan <br />Training <br />In many cases,an Emergency Response Plan will <br />be in place to provide direction to building <br />personnel or responders on how to safely evacuate <br />Confidentiality Class External Confidentiality Label Document Type Page <br />Ericsson Internal Analysis 22 (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