What is the maximum voltage allowed for limited-energy circuits under NEC guidelines?

The maximum voltage allowed for limited-energy circuits under NEC (National Electrical Code) guidelines is 30 volts. This standard is in place to ensure safety while allowing enough voltage to facilitate the operation of various types of low-power devices, such as signaling and control systems. By keeping the voltage at 30 volts or below, the NEC aims to minimize the risk of electric shock and fire hazards that could occur with higher voltages.

Limited-energy circuits are commonly found in applications such as alarm systems, low-voltage lighting, and other low-current devices, where both performance and safety are essential. The designation of 30 volts as the upper limit aligns with recognized safety standards and practices in the electrical industry, making it a widely accepted threshold for low-voltage applications.