Fire Alarms - continued
The standard recommends that smoke alarms and heat alarms installed within new single-family dwellings and small HMO's are mains powered with, in addition, a standby power supply in the form of a battery or capacitor.
There are six Grades of system in the standard. The grades identify the equipment incorporated. Grades A, B and C are systems that include fire detectors, alarm devices and central control equipment. Grades D and E are mains powered smoke alarm systems. A Grade F system includes a battery powered smoke alarm.
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