Which of the following is NOT characteristic of Class 1 circuits?

Class 1 circuits are specifically designed for low-voltage applications and typically operate below 30 volts. The primary characteristics of Class 1 circuits include their ability to share cabling with other circuits and their function of delivering power to equipment, such as alarms or controls, making them quite versatile in low voltage applications.

The important aspect that distinguishes Class 1 circuits from other classes is that while they can transmit control signals and provide power for functional equipment, they are not primarily used for signaling purposes, which is more characteristic of Class 2 and Class 3 circuits. Class 1 circuits can indeed carry power, which is essential for their operation, but the focus on signal transmission aligns more with higher-level functionality provided by the other classes.

By understanding these characteristics, it becomes clear that signaling, while it may be a part of the overall functionality of Class 1 circuits, is not their defining purpose compared to power delivery and shared cabling use.