What is the maximum voltage at which lighting systems shall be listed as a complete system?

The correct choice of 30 volts represents the maximum voltage threshold for lighting systems to be classified as a complete system according to certain safety regulations. This limit is significant because it aligns with industry standards designed to minimize the risk of electrical shock and ensure the safe operation of low-voltage lighting systems.

When a lighting system operates at or below 30 volts, it is generally deemed to pose a lower risk, making it suitable for various applications, including installations where safety is paramount, such as in residential or commercial settings with more vulnerable individuals. Maintaining this voltage limit helps protect installers and users from potential hazards while still allowing for effective lighting solutions.

Other voltage options are considered too low or too high, which would not meet the complete system classification criteria, thus emphasizing the importance of adhering to the defined maximum to ensure safety and compliance with electrical codes.