Limited class 1 circuits are limited to a maximum of how many volts?

Limited class 1 circuits are limited to a maximum of how many volts?

• A. 60
• B. 15
• C. 120
• D. 30

Answer: (D)

Limited-energy Class 1 circuits are kept at a very low voltage to minimize the risk of shock and arcing during maintenance or fault conditions. The maximum voltage allowed for these circuits is 30 volts. This threshold applies to the types of low-energy control and signal wiring used in these systems, whether the voltage is AC or DC as applicable. Choosing a value higher than 30 volts would move the circuit into a higher-energy category that carries greater shock risk and requires stricter safeguarding. So 30 volts is the correct limit.

Limited-energy Class 1 circuits are kept at a very low voltage to minimize the risk of shock and arcing during maintenance or fault conditions. The maximum voltage allowed for these circuits is 30 volts. This threshold applies to the types of low-energy control and signal wiring used in these systems, whether the voltage is AC or DC as applicable. Choosing a value higher than 30 volts would move the circuit into a higher-energy category that carries greater shock risk and requires stricter safeguarding. So 30 volts is the correct limit.