When using a dry cell battery as a power source for a Class 2 system, what must the voltage be?

The correct answer is that the voltage must be 30V or less when using a dry cell battery as a power source for a Class 2 system. Class 2 circuits, as defined by the National Electrical Code (NEC), are designed to operate at lower voltages to ensure safety and reduce the risk of electric shock. Specifically, Class 2 circuits are limited to a maximum voltage of 30V, making them suitable for low-voltage applications such as certain communication systems, signaling devices, and other electronic equipment.

This limitation helps to protect both the equipment and the users from potential hazards associated with higher voltage levels. Maintaining the voltage at or below this threshold ensures compliance with safety standards and regulations, as well as enhances the reliability of the system by minimizing electrical risks.

Maintaining voltage levels in this range is crucial for the safe operation and compliance of any low-voltage communication systems being installed or serviced in accordance with Arizona's contractor licensing regulations.