Specification for photoelectric control units for road lighting|Type testing, Electric control equipment, Lighting equipment, Road lighting, Electric sockets, Blades, Watertightness tests, Environmental testing, Testing conditions, Lighting (road signs), Control devices, Marking, Photoelectric cells, Lighting systems, Clearance distances, Test equipment, Dielectric strength, Dimensions, Protected electrical equipment, Road-lighting lanterns, Electrical resistance, Control equipment, Electrical testing, Circuits, Leakage paths, Design, Photoelectric devices, Electrical insulation