What is the maximum allowable voltage for a low voltage system according to NEC?

The maximum allowable voltage for a low voltage system according to the National Electrical Code (NEC) is indeed 30 volts AC or 60 volts DC. This standard is in place to ensure safety and reduce the risk of electrical shock when working with low voltage systems.

Low voltage systems are typically designed for applications where the risk of electric shock is significantly minimized. By limiting the voltages to 30 volts AC and 60 volts DC, the NEC establishes a safe threshold for equipment and systems that are intended to be accessible to users and workers. It is crucial for applications such as landscape lighting, telecommunications, and low-voltage lighting, as these systems may come into contact with individuals during normal usage.

The other choices present higher voltage limits that exceed the established safety thresholds for low voltage systems, which is why they do not comply with the NEC guidelines. Therefore, the correct choice reflects the standards set forth to maintain safety in electrical installations.