UL 1411:2016 PDF Download

The UL 1411:2016 standard provides requirements for transformers, autotransformers, and motor-transformers used in audio-, radio-, and television-type appliances. These appliances typically have the primary winding connected across the supply circuit. The standard also covers transformers used in high-frequency, switching-type power supplies where the transformer provides isolation from the supply circuit.

It's important to note that the standard does not apply to transformers used solely for transforming audio, video, and other signal waveforms, as these are covered by a separate standard called UL 1876 (Standard for Isolating Signal and Feedback Transformers for Use in Electronic Equipment).

Furthermore, the standard applies to transformers or motor transformers that include a separate current-limiting impedance, such as a positive temperature coefficient (PTC) device or a resistor. The requirements for these impedance devices are specified in other UL standards like UL 1412 (Standard for Fusing Resistors and Temperature-Limited Resistors for Radio- and Television-Type Appliances).