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The standard applies to electronic controlgear designed to operate on DC or AC power supplies up to 1,000 V (for alternating current at 50 Hz or 60 Hz), with an output frequency that can deviate from the supply frequency. Controlgear covered by this standard are designed to provide either constant voltage or constant current output, and the standard explicitly notes that deviations from pure voltage and current types do not exclude the gear from its scope.
Even with the PDF in hand, engineers make mistakes:
The standard applies to electronic controlgear designed to operate on DC or AC power supplies up to 1,000 V (for alternating current at 50 Hz or 60 Hz), with an output frequency that can deviate from the supply frequency. Controlgear covered by this standard are designed to provide either constant voltage or constant current output, and the standard explicitly notes that deviations from pure voltage and current types do not exclude the gear from its scope.
Even with the PDF in hand, engineers make mistakes: