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Panel won’t reset after an alarmed smoky kitchen suggests:
Residual contamination on detectors; clean per manufacturer
Definition: Residue holds sensors latched; clean and ventilate.
If "SLC" devices show duplicate addresses:
Communication faults occur; addresses must be unique
Definition: Duplicates conflict; assign unique addresses per plan.
Pull station at 60 inches AFF is:
Higher than common accessible range; relocate per design practice
Definition: Accessible reach typically targets the 42 to 48 inch operable height range.
Spot smoke detectors on peaked ceilings should be:
Placed per listing and slope rules; often near the peak but avoiding dead air
Definition: Follow slope guidance and avoid stagnant air pockets.
Beams deeper than standard allowances require:
Closer spacing or placement rules to avoid dead air
Definition: Deep beams can stratify smoke; adjust spacing/placement.
Detectors should be kept how far from supply diffusers (typical practice)?
A few feet to avoid drafts
Definition: Avoid strong air streams that dilute smoke.
A trouble that reads '"NAC" Open' means:
An open in notification wiring; investigate field run and "EOL"
Definition: Open circuits break supervision; locate and repair.
A tamper switch not reporting valve movement likely indicates:
Mechanical failure or wiring problem at the switch
Definition: Tamper should change state when the valve handle moves.
A door contact wired NC but programmed NO causes:
Misinterpreted status or constant alarms
Definition: Wiring and programming types must match.
If two relays control fan shutdown and one is not supervised:
A single failure can defeat shutdown; use listed supervised control circuits
Definition: Life safety control must be supervised and listed.
A detector behind a decorative beam often:
Sits in a dead air pocket and delays response
Definition: Avoid obstructions and dead air zones.
Programming a duct detector as 'supervisory only' when also initiating egress alarm will:
Conflict with required alarm functions; configure per sequence
Definition: If used for egress actions, annunciation must match the intended function.
An annunciator with no power loss reporting likely lacks:
Supervised power feed or monitoring of loss
Definition: Annunciators should indicate loss of power or communications.
Which code family decides WHEN systems are required in new work?
"IBC" adopted by the jurisdiction
Definition: The building code triggers the need; "NFPA" 72 governs design and installation once required.
"NFPA" 101 aligns occupant notification with:
Egress strategies and occupancy needs
Definition: Life Safety Code coordinates notification with means of egress and occupancy.
A Class A initiating circuit differs from Class B by:
Providing a return path so a single open does not isolate devices
Definition: Class A maintains operation past a single open.
Class N pathways apply to:
Ethernet based supervised transport for fire alarm traffic
Definition: Class N covers supervised network segments.
Public mode audibility target is commonly:
15 "dBA" above ambient
Definition: Fifteen "dBA" above average ambient helps signals stand out.
In sleeping rooms, preferred fire tone is:
520 hertz, Temporal 3
Definition: Low frequency 520 hertz improves arousal from sleep.
Strobes visible together must:
Be synchronized via listed means
Definition: Synchronization avoids disorientation.
A duct detector used only for equipment shutdown should report:
Supervisory
Definition: Equipment control without egress impact annunciates supervisory.
Two detector cross zone releasing uses:
Two independent initiations to discharge agent
Definition: Two events reduce inadvertent release.
Speaker systems should be designed for:
Some headroom and intelligibility targets
Definition: Headroom preserves clarity and reduces clipping.
Battery sizing sums:
Standby plus alarm loads over their required durations
Definition: Include both quiescent and active loads with margins.
Ground faults should:
Be annunciated and located for repair
Definition: Grounds can mask other faults and must be repaired.