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This standard differs from DIN 70042:2020-07 as follows: a) added: More detailed specification of the applicable environmental and operating conditions b) removed: Class X capacitors, as these are out of scope c) added: Photocouplers, Hall sensors, printed circuit boards d) added: Conformance tests for couplers with reinforced insulation, for isolating transformers and safety isolating transformers e) added: Annex providing information about typical working voltages and overvoltages of electric circuits.