Requirements for self-energized signs for luminosity requiring no external source of power. Design, construction, performance and labelling requirements are given, with appropriate test methods for the performance.Cross References:BS 89BS 2560BS 3203BS 3510BS 4937:Part 4BS 5499:Part 1BS 5499:Part 3BS 6220Radioactive Substances (Gaseous Tritium Light Devices) Exemption Order 1985