What does the term "EOL supervision" refer to in fire alarm systems?

The term "EOL supervision" refers to "End-of-line resistor supervision," which is a critical component in fire alarm systems. This system includes an end-of-line resistor placed at the end of a loop in the circuit, which helps to monitor the integrity of the wiring and devices connected to the fire alarm system.

By using this type of supervision, the fire alarm system can detect whether there is a short circuit, an open circuit, or a fault in the line. If the circuit is complete and functioning correctly, the resistance value at the end-of-line resistor reads as expected. However, if there is a malfunction—such as a cut wire or a damaged device—the resistance will change, prompting the system to alert users to the issue. This method enhances safety and reliability by ensuring that all components of the fire alarm system are operational.

The other options do not accurately reflect the correct terminology related to fire alarm systems, making them unsuitable in this context.