CAT Blueprint Reading & Interpretation 2 — Questions and Answers
Question 1: On a fire alarm blueprint, what does a dashed line typically represent?
- A concealed or hidden conduit run (Correct answer)
- A high-voltage power circuit
- A smoke detector zone boundary
- A future expansion area
Correct answer: A concealed or hidden conduit run
Dashed lines on electrical/fire alarm blueprints indicate wiring or conduit that runs concealed inside walls, ceilings, or floors.
Question 2: Which drawing type shows a cross-sectional view of a wall or floor assembly as if it were cut through?
- Plan view
- Elevation view
- Section view (Correct answer)
- Reflected ceiling plan
Correct answer: Section view
A section view (or sectional drawing) cuts through the structure to reveal interior construction details and assembly layers.
Question 3: What does the abbreviation 'AFF' mean on a fire alarm installation drawing?
- Above Finished Floor (Correct answer)
- Alarm Fire Frequency
- Automatic Fire Function
- Adjacent Floor Frame
Correct answer: Above Finished Floor
AFF stands for Above Finished Floor and indicates the mounting height of a device measured from the completed floor surface.
Question 4: A fire alarm blueprint shows a symbol with a circle containing the letter 'S'. What does this most likely represent?
- Strobe light
- Smoke detector (Correct answer)
- Sprinkler head
- Supervisory switch
Correct answer: Smoke detector
A circle with 'S' is the standard NFPA 72 symbol for a smoke detector on fire alarm drawings.
Question 5: On a reflected ceiling plan (RCP), what does the drawing represent?
- The ceiling as viewed from above looking down
- The ceiling as if a mirror were placed on the floor looking up (Correct answer)
- A structural framing plan for ceiling joists
- The underside of the floor above the ceiling
Correct answer: The ceiling as if a mirror were placed on the floor looking up
An RCP shows the ceiling layout as if you placed a mirror on the floor—you see the ceiling above you but oriented as a plan view.
Question 6: Which scale would provide the MOST detail for a fire alarm device layout in a small equipment room?
- 1/16" = 1'-0"
- 1/8" = 1'-0"
- 1/4" = 1'-0"
- 1" = 1'-0" (Correct answer)
Correct answer: 1" = 1'-0"
A 1"=1'-0" scale is the largest (most detailed) of the options, meaning one inch on paper equals one foot in reality.
Question 7: On a fire alarm riser diagram, what information is typically NOT shown?
- Number of devices per circuit
- Wire gauge and type
- Exact device mounting heights AFF (Correct answer)
- Panel location and type
Correct answer: Exact device mounting heights AFF
Riser diagrams show system topology, circuits, and wire specifications but not the precise AFF mounting heights of individual devices.
CAT Blueprint Reading & Interpretation 2
On a fire alarm blueprint, what does a dashed line typically represent?