How many inches apart must class 1 lines be located from class 2 or class 3 lines?

The correct answer is that class 1 lines must be located a minimum of 2 inches apart from class 2 or class 3 lines. This requirement is in place to ensure the safety and integrity of the alarm system installation. Class 1 lines typically handle the most critical circuits, such as those involving fire alarms or essential emergency systems, and maintaining this distance helps prevent interference or damage from electromagnetic interference that could arise from nearby lower-class lines.

By adhering to this 2-inch separation requirement, technicians can minimize potential issues and ensure compliance with safety standards, thus promoting a reliable operation of alarm systems. The specifications for spacing are designed to enhance overall system performance and reliability, protecting both the equipment and the individuals who depend on these systems.