What is the highest acceptable voltage limit for Class 1 circuits?

The highest acceptable voltage limit for Class 1 circuits is correctly noted as 30 volts. Class 1 circuits are defined within the National Electrical Code (NEC) as circuits with a maximum operating voltage of 30 volts. These circuits are typically designed to provide low-voltage power for various applications, including control and signaling. The limitation of 30 volts is established to ensure safety and minimize the risk of electrical shock while allowing enough voltage for effective operation of devices such as low voltage lighting and communication systems. This specific voltage limit helps to protect users and equipment from potential hazards associated with higher voltages typically found in other classes of circuits.