According to the NEC, the voltage on non-power-limited circuits may not exceed what value?

According to the NEC, the voltage on non-power-limited circuits may not exceed what value?

• A. 120V
• B. 240V
• C. 480V
• D. 600V

Answer: (D)

Non-power-limited circuits are those that don’t fall under the stricter power-limited (Class 2/3) rules, so the NEC sets a practical ceiling for how much voltage such circuits can carry. The limit is 600 volts between any two conductors or between a conductor and ground. This keeps insulation, equipment ratings, and safety measures aligned with common components and practices. So, while voltages like 120V, 240V, or 480V are typical and all fall under this limit, the maximum allowed by the NEC for non-power-limited circuits is 600V. If voltages higher than that are needed, higher standards and protections apply.

Non-power-limited circuits are those that don’t fall under the stricter power-limited (Class 2/3) rules, so the NEC sets a practical ceiling for how much voltage such circuits can carry. The limit is 600 volts between any two conductors or between a conductor and ground. This keeps insulation, equipment ratings, and safety measures aligned with common components and practices. So, while voltages like 120V, 240V, or 480V are typical and all fall under this limit, the maximum allowed by the NEC for non-power-limited circuits is 600V. If voltages higher than that are needed, higher standards and protections apply.