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

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