Concerning the illustrated fire detection...

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Question 1 of 2066636eed28f7522a1c51d431

Concerning the illustrated fire detection and alarm system, when the system is operating normally and under supervision, what is the status of the ground detector and the fire alarm relays? Illustration EL-0114

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🔍 Key Concepts

• Study how relays are drawn in their normal (supervisory) position on the diagram, and read the note about relay positions near the bottom right. • Trace the power path from the main and backup power supplies through the Main Supply Relay, Battery Relay, and then to the Ground Detector Relay coil. • Identify which relay (ground detector vs fire alarm) must stay energized in normal service to continuously monitor for faults, and which one only changes state when there is an actual fire alarm.

💭 Think About

• Look at the diagram legend/notes: when the system is in normal supervisory condition, how are the relay contacts shown? From that, what does it tell you about whether each relay coil is energized or de‑energized? • Follow the wiring to the Ground Detector Relay coil. In the normal condition (no ground fault, no fire), is there a complete circuit through that coil from positive to negative? • Now look for the Fire Alarm Relay coil that operates the bells. In the absence of a fire signal from detectors or the manual station, is its coil supplied with power, or is the circuit open somewhere?

✅ Before You Answer

• Verify in the note that "Relays shown in normal supervisory position" means the contacts are drawn as they are with the system operating normally (not in alarm). • Confirm whether the Ground Detector Relay coil has a closed path via the resistors and supply in the normal condition (no ground fault). • Confirm that the Fire Alarm Relay coil only receives power when a detector or manual station contact closes; in the illustrated, normal condition that path should be open.

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