Article 21-2 DUTIES AND RESPONSIBILITIES This article is included in your selections. Sections: 21-2-1 Installation and equipment standards. 21-2-2 Prohibited devices and systems. 21-2-3 Alarm business duties. 21-2-4 Alarm business monitoring responsibilities. 21-2-5 Enhanced call verification (ECV) procedures. 21-2-6 Alarm user duties.