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.
Paper B converts the fail-safe door duty into a sizing method: the continuous-lock energy budget, a chemistry scorecard, fail-safe egress coordination, cell architecture and the charger and supervision choices a multi-door site needs.
Unlike an alarm panel, an access-control door often draws current continuously to hold a magnetic lock. Paper A dissects that duty under EN 50133-1 and UL 294 and explains the fail-safe versus fail-secure tension.
Paper C maps the evidence a manufacturer needs to declare a graded alarm panel: EN 50131-6 standby and changeover tests, IEC 61951-2 cell endurance, IEC 62133-1 safety, UN 38.3 transport and the UK PD 6662 overlay.
Paper B turns the EN 50131-6 standby duty into a repeatable sizing method: the quiescent-plus-alarm energy budget, a chemistry scorecard, cell matching and the charger decisions that decide long-term reliability.
An intruder panel must keep every detector, loop and communicator alive when the mains is cut. Paper A dissects that standby duty under EN 50131-1 and EN 50131-6 and maps it onto a NiMH pack.
