ESA Certified Alarm Technician Practice Exam

Which of the following is NOT a type of wiring used in alarm systems?

1. Shielded

2. Twisted pair

3. Coaxial

4. Unsheilded

The correct answer is: Unsheilded

The correct choice indicates that "Unsheilded" is not a type of wiring used in alarm systems. In the context of alarm systems, the other options represent recognized types of wiring that serve specific purposes. Shielded wiring is designed to reduce electromagnetic interference by surrounding the conductor with a conductive layer or mesh. This is crucial in alarm systems where signal integrity is essential to ensure reliable operation. Twisted pair wiring consists of pairs of insulated copper wires twisted together. This setup helps to minimize noise and interference, which makes it widely used in communication and signaling applications within alarm systems. Coaxial wiring features a single copper conductor at its center, surrounded by a plastic layer and a metallic shield, making it excellent for carrying high-frequency signals over longer distances without degradation. Each of these wiring types plays a significant role in the functionality of alarm systems. However, “Unsheilded” is not a standard term or recognized class of wiring within the context of alarm systems, making it the correct choice for this question.