A fire panel must supervise its loops for a day on battery, then drive every sounder and beacon in full alarm. Paper A dissects that duty under EN 54-2 and EN 54-4 and maps it onto NiMH.
Paper C assembles the evidence for a small-UPS or instrument backup battery: IEC 62040-1 safety and 62040-3 performance classification, 62040-5 DC UPS, ride-through and recharge verification, IEC 61951-2, IEC 62133-1 and UN 38.3.
Paper B converts the ride-through duty into a sizing method: load and bridge-time energy budget, a chemistry scorecard against supercapacitors, VFD/VI/VFI and DC-UPS architecture, high-rate cell choice and the charger design for repeated outages.
A small UPS or instrument backup exists to bridge a mains disturbance for seconds to minutes. Paper A dissects that ride-through duty and the VFD, VI and VFI topologies defined by IEC 62040-3, mapping them to NiMH.
Paper C assembles the certification evidence for lift emergency batteries: EN 81-20 and EN 81-28 functionality tests, the one-hour standby and talk verification, five-party coverage, IEC 61951-2, IEC 62133-1 and UN 38.3.
Paper B provides the sizing method for both lift duties: the intercom one-hour-plus-talk energy budget and the ARD high-rate rescue calculation, a chemistry scorecard, five-party network scaling and pack and charger design.
A trapped-passenger scenario imposes two very different loads: a high-current ARD motor rescue lasting seconds and a low-current two-way intercom lasting an hour. Paper A dissects both under EN 81-20 and EN 81-28.
Paper C assembles the evidence for an access-control backup: UL 294 standby and endurance, EN 50133-1 security levels, the fail-safe fire-release verification, IEC 61951-2 and IEC 62133-1 cell evidence and UN 38.3 shipping.
