How is "low voltage" defined?

The correct definition of "low voltage" is often recognized as any voltage less than 600V. This classification is important in the electrical industry because it encompasses the majority of common electrical systems and applications, including residential and some commercial uses.

Defining low voltage as less than 600V allows for clear guidelines in safety regulations, installation practices, and equipment ratings in accordance with standards set by organizations such as the National Electric Code (NEC) and other industry standards. Systems operating under this threshold typically require different installation and safety considerations as compared to medium or high voltage systems, which are subjected to stricter regulations due to the greater risks involved.

In contrast to low voltage, other specified thresholds like less than 480V, less than 277V, or less than 1,000V do not universally align with the standard definitions used in the field. Each of these voltages might apply in specific contexts but they do not represent the broader classification of low voltage as effectively as the less than 600V standard.