Class 1 power-limited circuits shall be supplied from a source that has a rated output of not more than __________ volts.

Class 1 power-limited circuits are designed to operate with a reduced risk of electric shock, making them safer for use in various applications, particularly in low-voltage installations. The National Electrical Code (NEC) defines Class 1 circuits as those that operate at a nominal voltage not exceeding 30 volts.

This voltage limit is significant because it establishes a balance between sufficient power delivery and safety. By not exceeding 30 volts, the risk of electrical shock to users is minimized while allowing the circuits to carry sufficient power for many devices and systems, such as signaling, communications, and control functions.

Understanding this voltage limit is crucial for ensuring compliance with safety standards in installations involving low-voltage systems. In contrast, higher voltage thresholds, such as 50 or 100 volts, would categorize the circuits differently and would be subject to more stringent safety and installation requirements.