What is the difference between SELV, PELV and FELV?

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SELV is Safety Extra Low Voltage, PELV is Protective Extra Low Voltage and FELV is Functional Extra Low Voltage.

Answered by Dave, Electrical Safety Expert

  • SELV is Safety Extra Low Voltage; its output voltage is in the Extra Low Voltage range (Generally <50VAC/120VDC or 25VAC/60VDC) it has a double or reinforced layer of insulation between the Extra low voltage output and the Low voltage (Mains input).
  • PELV is Protective Extra Low Voltage; its output voltage is in the Extra Low Voltage range (Generally <50VAC/120VDC or 25VAC/60VDC) it has a double or reinforced layer of insulation between the Extra low voltage output and the Low voltage (Mains input), similar to SELV apart from it is not electrically separated from Earth.
  • FELV is Functional Extra Low Voltage; its output voltage is in the Extra Low Voltage range (Generally <50VAC/120VDC or 25VAC/60VDC) However, it does not have a double or reinforced layer of insulation between the Extra low voltage output and the Low voltage (Mains input).

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