When concerning wiring methods and materials on the load of Class 2 or Class 3 power sources, what is the maximum rating for overcurrent devices protecting certain circuits?

When concerning wiring methods and materials on the load of Class 2 or Class 3 power sources, what is the maximum rating for overcurrent devices protecting certain circuits?

• A. 10 amperes
• B. 15 amperes
• C. 20 amperes
• D. 30 amperes

Answer: (C)

The correct answer regarding the maximum rating for overcurrent devices protecting Class 2 and Class 3 circuits is 20 amperes. This is outlined in the National Electrical Code (NEC) which specifies that these class circuits are designed to limit the voltage and power output to safe levels for low voltage applications. Class 2 circuits can operate at a maximum of 60 volts and a maximum output of 100 watts, while Class 3 circuits are allowed a maximum of 100 volts and 100 watts, but still with the same overcurrent protection limit of 20 amperes. This limitation ensures that the circuits remain safely inside the parameters established to protect both equipment and users from potential hazards like overheating and electrical shock. If an overcurrent device were rated higher than 20 amperes, it could allow too much current to flow through the circuit, potentially leading to insulation failure or fire hazards. Hence, maintaining the specification of 20 amperes is vital for safety in the installation and performance of these electrical systems.

The correct answer regarding the maximum rating for overcurrent devices protecting Class 2 and Class 3 circuits is 20 amperes. This is outlined in the National Electrical Code (NEC) which specifies that these class circuits are designed to limit the voltage and power output to safe levels for low voltage applications.

Class 2 circuits can operate at a maximum of 60 volts and a maximum output of 100 watts, while Class 3 circuits are allowed a maximum of 100 volts and 100 watts, but still with the same overcurrent protection limit of 20 amperes. This limitation ensures that the circuits remain safely inside the parameters established to protect both equipment and users from potential hazards like overheating and electrical shock.

If an overcurrent device were rated higher than 20 amperes, it could allow too much current to flow through the circuit, potentially leading to insulation failure or fire hazards. Hence, maintaining the specification of 20 amperes is vital for safety in the installation and performance of these electrical systems.