These requirements apply to isolating signal and feedback transformers intended to be used in electronic equipment where only audio@ video@ and other signal waveforms are transformed. These transformers are intended to provide isolation from circuits that are either conductively connected to a branch circuit supply or connected to secondary circuits involving voltages that are considered to present a risk of electric shock by the nature of their use in an end-product. These requirements do not apply to transformers and motor-transformers that are connected to a supply circuit to power a secondary circuit.