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Records of completion and test reports should be kept:
On site and available for the "AHJ"
Definition: Maintain on site documentation for audits, maintenance, and modifications.
When devices are added to a "NAC", you must recalc:
Voltage drop, current, and battery capacity
Definition: New loads impact voltage and capacity; update calculations and documentation.
A documented fire watch is required when:
The system is impaired or out of service per policy/code
Definition: Impairments that remove protection require temporary measures and notifications.
Visual inspection frequencies for many devices are:
Monthly or quarterly depending on device type
Definition: Visual inspections catch obvious issues; frequencies vary by component.
Sprinkler supervisory and waterflow test frequency commonly is:
Quarterly functional tests
Definition: Valve supervisory and waterflow switches are often tested quarterly.
After panel firmware updates, you should:
Perform targeted reacceptance tests of affected features
Definition: Software changes can alter behavior; verify functions impacted by the update.
Device labeling should:
Match drawings with clear locations and functions
Definition: Clear point text speeds response and reduces errors.
Baseline measurements for speakers include:
Intelligibility metrics where required plus SPL data
Definition: Capture both level and intelligibility baselines for future comparisons.
If a duct detector sampling tube is reversed, you may see:
Weak or no response to smoke tests
Definition: Orientation matters; reversed tubes fail to sample correctly.
When replacing sealed lead acid batteries, select:
Listed type with matching voltage and amp hour rating
Definition: Use listed, matching batteries and record the installation date.
Documentation updates are required when:
Devices are added, removed, or reprogrammed
Definition: Keep as builts and records current to reflect system changes.
Owner training should include:
Event response, impairments, restoration, and who to notify
Definition: Trained owners manage events and testing safely.
During testing, communicating with occupants is:
Important for safety; use announcements and signage
Definition: Clear communication prevents panic and ensures safe operations during tests.
A 24 "VDC" circuit at 2.0 amps over long 18 "AWG" runs risks:
Low end of line voltage and dim strobes
Definition: High current on small gauge wire increases voltage drop; end devices may underperform.
Reducing current draw on a "NAC" will:
Decrease voltage drop and improve end of line voltage
Definition: Drop equals current times resistance; less current means less voltage loss.
If total speaker taps equal 42 watts on a 50 watt amplifier, you have:
Headroom to avoid clipping
Definition: Operating below rated watts leaves margin for peaks and intelligibility.
If a device requires 16-33 V and receives 14.8 V at the "EOL" under alarm, it is:
Below range and may malfunction
Definition: Keep worst case voltage within the listed operating window.
Wire resistance decreases when:
Gauge size increases (thicker wire)
Definition: Larger diameter conductors have lower resistance per foot.
Two 12 V, 12 Ah batteries in series create:
24 V, 12 Ah
Definition: Series adds voltage, amp hour stays the same.
Two 12 V, 12 Ah batteries in parallel create:
12 V, 24 Ah
Definition: Parallel adds capacity, voltage stays the same.
A corridor of 9 feet width allows spot smoke detectors approximately every:
41 feet
Definition: Narrow corridors often use about forty one feet spacing; confirm with listings.
Voltage drop can be reduced by:
Larger wire or distributed supplies
Definition: Larger gauge or shorter runs cut resistance and drop.
If a "NAC" draws 2.5 amps and wire loop resistance is 3 ohms, the drop is:
7.5 volts
Definition: V equals I times R. 2.5 times 3 equals 7.5 volts drop.
A 24 V system with 7.5 V drop delivers to end devices about:
16.5 V
Definition: 24 minus 7.5 equals 16.5 volts at the end.
If battery standby current is 0.25 amps for 24 hours, amp hours needed for standby are:
6.0 Ah
Definition: 0.25 times 24 equals 6.0 amp hours before alarm allowance and derating.