Appendix III Safety equivalence of IEC 60950-1 and IEC 62368-1 Introduction This data is from IEC 62368-1 Annex W (informative) Comparison of terms introduced in this standard. People miss the important Annex statement of “The (sic electrical energy source) electrical characteristics are not identical to TNV circuits but will give equivalent level of safety”. Thus it is wrong to say a circuit containing an ES2 on which transients occur is equivalent to a TNV-3 circuit. But one can say that the same safety rules apply. Safety equivalence From a safety perspective the following approximations can be made according to IEC 62368-1 Annex W. Table III.1 Safety equivalence of IEC 60950-1 and IEC 62368-1 IEC 60950-1 IEC 62368-1 SELV ES1 TNV-1 ES1 External circuits have impulse testing see NOTES 1 through 3 TNV-2 ES2 TNV-3 ES2 External circuits have impulse testing see NOTES 1 through 3 NOTE 1 Paired conductor (shielded or unshielded) - tested with1500 V, 10/700. Only differential if one conductor is earthed in the equipment NOTE 2 Any other conductors – tested with mains transient or known external circuit overvoltage impulse whichever is higher. The external circuit is not earthed at either end, but there is an earth reference NOTE 3 Cable distribution network coaxial cable – tested with 4000 V, 10/700 centre conductor to shield cable (shield is earthed at the equipment). Not applicable to power-fed coaxial repeaters.
Appendix III Safety equivalence of IEC 60950-1 and IEC 62368-1 Introduction This data is from IEC 62368-1 Annex W (informative) Comparison of terms introduced in this standard. People miss the important Annex statement of “The (sic electrical energy source) electrical characteristics are not identical to TNV circuits but will give equivalent level of safety”. Thus it is wrong to say a circuit containing an ES2 on which transients occur is equivalent to a TNV-3 circuit. But one can say that the same safety rules apply. Safety equivalence From a safety perspective the following approximations can be made according to IEC 62368-1 Annex W. Table III.1 Safety equivalence of IEC 60950-1 and IEC 62368-1 IEC 60950-1 IEC 62368-1 SELV ES1 TNV-1 ES1 External circuits have impulse testing see NOTES 1 through 3 TNV-2 ES2 TNV-3 ES2 External circuits have impulse testing see NOTES 1 through 3 NOTE 1 Paired conductor (shielded or unshielded) - tested with1500 V, 10/700. Only differential if one conductor is earthed in the equipment NOTE 2 Any other conductors – tested with mains transient or known external circuit overvoltage impulse whichever is higher. The external circuit is not earthed at either end, but there is an earth reference NOTE 3 Cable distribution network coaxial cable – tested with 4000 V, 10/700 centre conductor to shield cable (shield is earthed at the equipment). Not applicable to power-fed coaxial repeaters.
guide_to_the_electrical_parameter_classifications_of_iec_60950_and_iec_62368_safety_standards.docx