7.5　Lighting

7.5.1　The power supply networks for normal work lighting and for emergency lighting of the hydropower station shall be installed separately.Electricity for normal work lighting shall be supplied by the plant service power.Electricity for emergency lighting may be supplied by storage battery sets or other power sources if the alternating current source is completely lost.

7.5.2　Emergency lighting shall be installed at locations and main accesses where work needs to be continued after the interruption of normal lighting due to breakdowns.Emergency lighting is not required for outdoor switchgear installations.(https://www.daowen.com)

7.5.3　For the lowest illumination standards and lighting safety measures for normal lighting and emergency lighting of the hydropower station，refer to the current professional standard of Code for Lighting Design of Hydropower Station，DL/T-5140.