Oklahoma Electrical Practice Exam

For a dry cell battery to be considered a class 2 power supply, what is the largest allowable voltage?

1. 20 volts

2. 30 volts

3. 40 volts

4. 50 volts

The correct answer is: 30 volts

In the context of electrical systems, a Class 2 power supply is designed to ensure safety and reduce the risk of electrical shock and fire hazards. For a power supply to be classified as Class 2, it must adhere to specific voltage limitations to mitigate those risks. The maximum allowable voltage for a Class 2 power supply is set at 30 volts. This threshold is significant because it is generally considered a safe voltage level for reducing the likelihood of electrical shock under normal conditions. By restricting the voltage to this level, electrical systems can be made safer, especially in residential and commercial applications where a wide range of users may come in contact with the equipment. Thus, for a dry cell battery to be classified as a Class 2 power supply, it must not exceed this 30-volt maximum, making the correct answer appropriate in aligning with industry standards that prioritize safety.