Definition(s)
Safety Extra-low Voltage System (SELV)
Electric system in which the voltage cannot exceed the value of extra-low voltage:
- under normal conditions and
- under single fault conditions, including earth faults in other electric circuits.
Source: IEC 60079-14:2013, Explosive atmospheres – Part 14: Electrical installations design, selection and erection, Edition 5.0, November 2013. Global Standards