All alarm systems shall be equipped with an uninterruptible backup power supply which shall operate in such a manner so that in the event of failure or interruption of normal utility service power the alarm system will not be activated. The backup power supply shall be capable of maintaining the alarm system in operation for at least four hours following the interruption of the normal power supply. The backup system shall not be capable of activating the alarm system by virtue of a defect in its condition.
(Res. No. 70 94-95 §1 (part))