ESA Certified Alarm Technician Practice Exam

The maximum amperage that can be used to protect the transformer supplying power to the alarm control panel, as indicated by NEC 725.127, is 20 amps. This regulation is essential because it ensures that the transformer is adequately protected from overload conditions, which can prevent potential hazards such as overheating or fire. By limiting the amperage to 20 amps, the code helps to guarantee the safe operation of the alarm system while providing enough power to meet the operational demands of the control panel. The correct choice reflects the balance between safety and functionality in the electrical design of fire alarm systems. This specification assists technicians and installers in making informed decisions about their installations to comply with national electrical safety standards. Understanding these limits helps ensure that the installed systems function reliably while safeguarding against electrical faults.