Upon the suspension, revocation, or disconnection of any alarm system pursuant to the electrical code of the City after the system has been shown to be the source of excessive false alarms, the City shall be relieved of all responsibility for responding to any alarm other than a direct notification by a natural person unaided by mechanical or electronic voice reproduction on the premises of a police or fire emergency thereon. (Ord. 79-2 § 2, 1979.)