Paper C builds the evidence stack for a ward UPS battery: UPS classification, medical-location installation rules, alarm-system continuity and the discharge and aging tests a manufacturer must keep on file.
Paper B works the ampere-hour budget of a small ward UPS, compares NiMH with VRLA on float readiness and temperature, and shows why short high-reliability bridges favour nickel-metal hydride.
A ward UPS does not need hours of energy; it needs seconds-to-minutes of clean ride-through until the generator or ATS closes. Paper A decomposes the nurse-station load under IEC 62040-3 and IEC 60364-7-710.
Paper C builds the system-level evidence stack for a central emergency installation: EN 50171 hardware, EN 50172 system practice, EN 62034 automatic testing, GB 17945 and cell-level safety.
Paper B sizes a central emergency bank from its final-circuit loads and duration tier, compares NiMH strings with VRLA racks and LiFePO4, and addresses series-string management and float regime.
A central battery system removes cells from each luminaire and concentrates them in one supervised bank. Paper A explains the EN 50171 architecture, monitored final circuits and the bank discharge duty.
Paper C sets out the optical and electrical evidence behind a certified illuminated sign: ISO 7010 symbol geometry, EN 1838 luminance and contrast, viewing-distance test, duration and self-test records.
Paper B links optical requirements to battery sizing: the d=200h recognition rule, minimum colour luminance and contrast set LED power, which sets the NiMH cell count needed for three hours.
