23 CAR § 466-1106. Emergency power operation

(a) Each LEC shall provide emergency power for each central office. (b) Each central office without a permanently installed emergency power system shall be wired to permit connection of a mobile emergency power unit, and there shall be a mobile emergency power unit available for connection on short notice with minimum travel time. (c) Each central office shall be equipped with a battery reserve sufficient to sustain operation until emergency power can be connected.