This Standard (IET 01:2024) includes definitions, requirements and tests for open PEN detection devices (OPDDs). During a protective earth neutral (PEN) fault, hazardous touch-voltages may occur at exposed-conductive-parts, including metallic parts of an electric vehicle (EV), connected to the supply PEN conductor by installation and equipment protective conductors.

• Disclaimer
• Acknowledgements
• Technical Committee
• Foreword
• Introduction to the Standard
• Section 1: Scope
• Section 2: Normative references
• Section 3: Terms and definitions
• Section 4: Classification
• Section 5: Characteristics
• Section 6: Marking and other product information
• Section 7: Standard conditions for operation in service and for installation
• Section 8: Requirements for construction and operation
• Section 9: Tests
• Appendix A: Glossary of symbols
• Appendix B: Informative references
• Annex A: (Informative) Relationship between this Standard and BS 7671 requirements
• Annex B: (Informative) Explanation of the methods of operation compared with touch-voltages in an open PEN event
• Annex BB: (Normative) Determination of clearances and creepage distances
• Annex BC: (Normative) Arrangement for the detection of the emission of ionized gases during short-circuit tests
• Annex BE: (Informative) Methods for determination of power factor
• Annex C: Reserved for future use
• Annex D: (Informative) Examples of terminal designs
• Lists of Figures and Tables
• Index