All interior fire alarm systems shall be supervised closed circuit electrically operated systems except that in specific instances, where deemed adequate for the purpose by the Division of Fire, manually operated trip fire gongs not less than eight (8) inches in diameter may be installed in buildings not more than two (2) stories in height, and except that open circuit systems may be installed in specific instances where deemed adequate for the purpose by the Division in buildings where noncoded systems are permitted by this Fire Prevention Code and where not more than two (2) alarm sending stations are required.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)