725.45(D)]. Class 1 circuits must be installed per Part I of Art ... With the conductors of electric light, power, non-power-limited fire alarm, and medium power network-powered broadband ...

Article 760 covers the installation of wiring and equipment for fire alarm systems, including circuits controlled and powered by the fire alarm. Those circuits are for such things as fire detection ...

Concrete floors, ceilings and walls? Groovy. New Fire Alarm Circuit Regulations A new issue was addressed in the 2014 edition of the NEC that surprised many in the life safety business.