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7. Explanation of terms:
— Continuous battery power supply
In this mode, the battery is constantly kept in full charge. It only gives off current if the DC source,
supplied by the mains, fails.
— Nominal capacity:
The nominal capacity is the value in ampere-hours for a 20-hour even, uninterrupted discharge
with I20 up to the discharge voltage of 1.75 V/cell at a temperature of 22°C.
— Capacity:
The capacity of a battery is the amount of electricity which can be extracted under the conditions
in question. It depends on the discharge current, the discharge voltage and the temperature.
— Service life
For batteries in alarm apparatus and emergency announcing systems, the end of a battery’s servive
life is reached when the capacity is less than 80% of the rated capacity.
— Stored energy time
This is the time span between recognizing a failure in the mains supply and remedying this
failure.
— Alarm duration
The alarm duration is the time during which the alarm signal is given off.
— Emergency announcement duration
This is the time during which announcements are made to clear the building or section of a
building.