Intrinsic Safety (IS) is a protection technique for safe operation of electrical equipment in hazardous areas by limiting the energy available for ignition. In signal and control circuits that can operate with low currents and voltages, the intrinsic safety approach simplifies circuits and reduces installation cost over other protection methods. Areas with dangerous concentrations of flammable gases or dust are found in applications such as petrochemical refineries and mines. As a discipline, it is an application of inherent safety in instrumentation. High-power circuits such as electric motors or lighting cannot use intrinsic safety methods for protection. thumb|right|An intrinsically-safe (walkie talkie radio, which has been designed and tested to not become an ignition source in a flammable atmosphere. Test standards may specify combinations of internal failures which may be present while still passing the ignition test An OSH glossary used in safety and health at work which is, adopted by ILO