E-2704.1 General: Emergency electrical systems are those systems required to supply power automatically for illumination and equipment in the event of failure of the normal power supply. The emergency electrical system shall conform to Article 700 of NFPA 70, except as otherwise provided for in this code or the regulations adopted pursuant thereto. The systems shall pick up their connected loads within 10 seconds after failure of the normal power supply and shall operate under all weather conditions.