In industrial settings, autotransformers can supply nominal loads from 480-volt systems without a grounded conductor up to what voltage?

Autotransformers are used in various industrial applications to adjust voltage levels while minimizing the physical size and cost compared to conventional transformers. An autotransformer is capable of stepping up or stepping down voltage efficiently because it utilizes a single winding for both the primary and secondary circuits.

When considering an autotransformer supplying nominal loads from a 480-volt system without a grounded conductor, it is essential to recognize its operational limits. The maximum output voltage an autotransformer can achieve while still being considered safe and effective typically goes up to 600 volts. This limit adheres to the standards and regulations governing electrical installations, which aim to minimize risks associated with higher voltages. Operating beyond this threshold introduces additional safety concerns and may necessitate different equipment or configurations, which could be more complex and costly.

Thus, the response indicating that autotransformers can supply nominal loads from a 480-volt system up to 600 volts accurately reflects industry standards and practices.