1.1 These requirements cover.
a) Discrete electrical control units and accessories for fire alamm systems;
b) Electrically- and elecroinially-operated amplifers that provide speech communication and distinctive sounds in conjunction with fire protective signaling systems; and
c) Commercial stationary and fixed power supplies for fire-protective signaling systems, having input and output ratings of not more than 600 Vv, direct- and altmating-current, (DC and AC).
