The maximum power supply rating for a lighting system under Article 411 is _____ amps?

The maximum power supply rating for a lighting system under Article 411 is correctly identified as 25 amps. Article 411 of the National Electrical Code (NEC) pertains to "Low Voltage Lighting Systems," which specifically governs the use and installation of lighting systems operating at low voltage levels, typically below 30 volts.

This restriction on amperage is crucial as it helps ensure safety and manage the potential impacts of electrical faults. Low voltage systems are generally easier to work with and pose a lower risk of electrical shock, which is why the code limits the current to 25 amps. This limit helps not only to safeguard electrical professionals during installation and maintenance but also protects end-users from hazardous conditions.

When choosing the maximum allowable current for low-voltage lighting, it’s also essential to consider the wiring, circuit breakers, and load calculations, all of which are tailored to ensure safety and functionality without exceeding the outlined limits in the code.