NICET FAS-II common mistakes
NICET FAS-II · Understand the traps and how to avoid them.
Uses the 30 ft / 900 sq ft spot-type smoke detector spacing for heat detectors, or applies it unchanged to sloped, beamed, or high ceilings.
The two spacing rules are studied back-to-back and 30 ft / 900 sq ft is the most repeated number in study material, so it becomes the default answer for any detector-spacing question.
What to do instead
Memorize the spacing pairs separately (smoke vs. heat) and then apply the correction steps in order: 0.7 x listed spacing to walls, reduction for ceiling height, beam-depth rules, then final layout. Practice by laying out one room of each ceiling type.
Answers a question about conductor installation, raceway fill, or box size by citing NFPA 72 instead of NFPA 70.
NFPA 72's installation chapter and NEC Article 760 cover adjacent topics, so the two blur together, and candidates memorize the shorthand 'fire alarm = NFPA 72'.
What to do instead
Build a one-page document map: performance, spacing, testing -> NFPA 72; wiring methods, conductors, raceways, boxes -> NFPA 70 (Art. 760, 300, 314); egress and occupancy -> NFPA 101. Scan question keywords ('ampacity', 'fill', 'support', 'marking') before choosing the reference.
Publishes a notification appliance layout with no voltage drop calculation, or calculates using 24 V at the panel rather than the worst-case battery voltage at the far end of the circuit.
Panel cut sheets and design software show 24 V, and the calculation is time-consuming, so it is skipped or done optimistically from the source.
What to do instead
Run the calculation at the panel's low-battery voltage, use the actual conductor gauge and out-and-back length, sum the appliance loads, and compare the result against each appliance's listed minimum operating voltage. Show the calculation on the drawings.
Describes a Class B initiating circuit as having a return conductor, or describes a Class A circuit as not needing separation or identification.
Class A and Class B differ only in the return path and the fault each tolerates, which is easy to reverse when recalled from memory.
What to do instead
Sketch both from scratch: Class B = two wires, single open disables everything beyond the break, end-of-line device required; Class A = four wires with a return path, survives a single open, no EOL. Then state aloud which fault each survives.
Assigns an annual frequency to every inspection and test item on a schedule.
Annual is the most familiar interval and the testing table is long, so candidates default to it rather than look up each row.
What to do instead
Rebuild the frequency matrix line by line from the testing table in the adopted edition, tagging each item as monthly, quarterly, semiannual, or annual, and flag the items that also carry a specified test method or acceptance criterion.
Loads notification appliances onto an initiating device circuit, or computes battery standby using only the panel's quiescent draw.
The panel is described as 'powering the system' and both circuit types land on terminals in the same enclosure, so the power paths look interchangeable.
What to do instead
Separate the two power paths on paper: initiating circuits are panel-supplied and supervised for alarm/trouble; notification circuits draw from NAC outputs or a booster supply. Battery standby = panel quiescent plus all supervisory loads, then add the alarm load for the required alarm duration.
Produces a floor plan showing detector and appliance symbols but no legend, no note on ceiling height and construction, and no device schedule.
Candidates concentrate on device placement and treat drawing boilerplate as clerical work that does not affect the design.
What to do instead
Include a symbol legend, a general note stating ceiling height, construction, and beam depth, and a device schedule listing model, spacing, and candela/dB ratings - these are what a reviewer uses to verify spacing and audibility.
Routes notification and initiating circuits without checking whether circuit integrity (survivability) is required for the occupancy, or assumes any conduit satisfies it.
Survivability applies only to specific occupancies and specific paths, and the requirement sits in a different chapter from the general wiring rules, so it is checked late or not at all.
What to do instead
Before routing, determine from the occupancy and system type whether a 2-hour circuit integrity method is required, then select a listed method (CI cable, metal raceway with CI, or an equivalent listed assembly) and show it explicitly on the riser diagram.
Quotes Annex material as an enforceable requirement, or uses 'listed', 'labeled', and 'approved' interchangeably.
Annexes read like code text and the three product terms appear side by side in the definitions section, so they are recalled as synonyms.
What to do instead
Annexes are explanatory unless the document says otherwise - cite the numbered body section instead. Keep the definitions straight: listed = published by a testing laboratory, labeled = bears the mark, approved = accepted by the authority having jurisdiction.
Performs the battery calculation with a fixed 24-hour standby without confirming the standby and alarm durations required for that system category and occupancy.
The 24-hour figure is the default taught for commercial systems, and the exceptions live in a table that is easy to skip under time pressure.
What to do instead
Look up the required standby and alarm durations for the specific system category and occupancy in the adopted edition, then compute (standby current x standby hours) + (alarm current x alarm minutes / 60), apply the derating/aging factor, and size to the next standard battery rating.