(1) Illumination of the means of egress shall be continuous during the time that conditions of occupancy require that the means of egress be available for use.

(2) Automatic emergency lighting shall be provided and so arranged as to provide the required illumination automatically in the event of any interruption of normal lighting, such as the failure of public utility or other outside electrical power supply, opening of a circuit breaker or fuse, or any manual act(s) including accidental opening of a switch controlling normal lighting facilities.

(3) Electric battery-operated emergency lights shall use only reliable types of storage batteries, provided with suitable facilities for maintenance in properly charged condition. Electric storage batteries used in such lights or units shall be approved for their intended use and shall comply with the National Electrical Code, NFPA 70.