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ICC RF Residential Fire Sprinkler Inspector/Plans
Examiner- Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST RELEASED
1. During a rough-in inspection of a residential fire sprinkler system, you notice CPVC pipe installed
within 12 inches of a recessed light fixture. What action should you take?
A) Approve if the light is LED
B) Require a heat shield or pipe relocation
C) Ignore because sprinklers are plastic
D) Allow if the fixture is not in a closet
*Answer: B — CPVC has a temperature limit of 150°F; recessed lights can exceed that, requiring a shield
or 12-inch clearance per NFPA 13D.*
2. A homeowner wants to install a hanging clothes rod in a closet with a sidewall sprinkler directly
below. The sprinkler deflector is 6 inches below the rod. Is this acceptable?
A) Yes, because sidewall sprinklers cover closets
B) No, because the rod will obstruct the spray pattern
C) Yes, if the rod is less than 4 inches wide
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D) No, unless the rod is removed during a fire
Answer: B — Obstructions within the sprinkler’s discharge pattern can block water distribution; NFPA
13D prohibits such obstructions.
3. While reviewing plans, you see a multipurpose residential fire sprinkler system tied to the domestic
water supply without a backflow preventer. The water supply is public. What do you require?
A) No backflow needed for multipurpose systems
B) A reduced pressure zone (RPZ) backflow preventer
C) A double check valve assembly (DCVA)
D) An atmospheric vacuum breaker only
Answer: C — NFPA 13D and plumbing codes require a DCVA for public water supplies to protect against
stagnant water backflow.
4. A contractor installs a concealed sprinkler head but forgets to install the decorative cover plate. The
ceiling is finished. You should:
A) Pass inspection since the sprinkler operates without cover
B) Fail the inspection until cover plates are installed
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C) Accept if the cover plate is stored nearby
D) Require a new sprinkler head
Answer: B — Cover plates are required to prevent cold soldering and delay sprinkler activation; missing
plates fail per NFPA 13D.
5. You are inspecting a new home where the sprinkler system’s flow test shows 25 gpm at the
residential water meter. The design requires 30 gpm. What is your next step?
A) Approve because flow tests vary daily
B) Require a booster pump or redesign
C) Accept if the pressure is higher than 40 psi
D) Reduce the number of sprinkler heads
Answer: B — NFPA 13D requires available flow and pressure to meet system demand; shortfall requires
pump or redesign.
6. A plans examiner notices that a designer used 3/4-inch CPVC pipe for a branch line feeding four
sprinklers in a dwelling unit. The farthest sprinkler is 80 feet from the riser. Is this allowed?
A) Yes, CPVC can run any distance
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B) No, NFPA 13D limits CPVC branch line length to 50 feet for 3/4 inch
C) Yes, if all sprinklers are quick-response
D) No, but only if the pipe is exposed to sunlight
*Answer: B — NFPA 13D Table 6.4.3.2 limits 3/4-inch CPVC branch lines to 50 feet for hydraulic
reasons.*
7. During final inspection, you see that the water flow alarm bell for the residential sprinkler system is
mounted outside but not visible from any bedroom window. Is this a violation?
A) Yes, it must be visible from the primary bedroom
B) No, only an interior alarm is required for residential
C) Yes, it must be seen by responding firefighters
D) No, as long as it can be heard inside all sleeping areas
*Answer: B — NFPA 13D requires an audible alarm inside the dwelling; an exterior bell is optional in
one- and two-family dwellings.*
8. A builder proposes to use PEX piping for a stand-alone residential fire sprinkler system. The PEX is not
listed for fire sprinkler use. What do you tell them?
ICC RF Residential Fire Sprinkler Inspector/Plans
Examiner- Questions with Correct Answers and
explanations LATEST THIS YEAR -JUST RELEASED
1. During a rough-in inspection of a residential fire sprinkler system, you notice CPVC pipe installed
within 12 inches of a recessed light fixture. What action should you take?
A) Approve if the light is LED
B) Require a heat shield or pipe relocation
C) Ignore because sprinklers are plastic
D) Allow if the fixture is not in a closet
*Answer: B — CPVC has a temperature limit of 150°F; recessed lights can exceed that, requiring a shield
or 12-inch clearance per NFPA 13D.*
2. A homeowner wants to install a hanging clothes rod in a closet with a sidewall sprinkler directly
below. The sprinkler deflector is 6 inches below the rod. Is this acceptable?
A) Yes, because sidewall sprinklers cover closets
B) No, because the rod will obstruct the spray pattern
C) Yes, if the rod is less than 4 inches wide
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D) No, unless the rod is removed during a fire
Answer: B — Obstructions within the sprinkler’s discharge pattern can block water distribution; NFPA
13D prohibits such obstructions.
3. While reviewing plans, you see a multipurpose residential fire sprinkler system tied to the domestic
water supply without a backflow preventer. The water supply is public. What do you require?
A) No backflow needed for multipurpose systems
B) A reduced pressure zone (RPZ) backflow preventer
C) A double check valve assembly (DCVA)
D) An atmospheric vacuum breaker only
Answer: C — NFPA 13D and plumbing codes require a DCVA for public water supplies to protect against
stagnant water backflow.
4. A contractor installs a concealed sprinkler head but forgets to install the decorative cover plate. The
ceiling is finished. You should:
A) Pass inspection since the sprinkler operates without cover
B) Fail the inspection until cover plates are installed
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C) Accept if the cover plate is stored nearby
D) Require a new sprinkler head
Answer: B — Cover plates are required to prevent cold soldering and delay sprinkler activation; missing
plates fail per NFPA 13D.
5. You are inspecting a new home where the sprinkler system’s flow test shows 25 gpm at the
residential water meter. The design requires 30 gpm. What is your next step?
A) Approve because flow tests vary daily
B) Require a booster pump or redesign
C) Accept if the pressure is higher than 40 psi
D) Reduce the number of sprinkler heads
Answer: B — NFPA 13D requires available flow and pressure to meet system demand; shortfall requires
pump or redesign.
6. A plans examiner notices that a designer used 3/4-inch CPVC pipe for a branch line feeding four
sprinklers in a dwelling unit. The farthest sprinkler is 80 feet from the riser. Is this allowed?
A) Yes, CPVC can run any distance
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B) No, NFPA 13D limits CPVC branch line length to 50 feet for 3/4 inch
C) Yes, if all sprinklers are quick-response
D) No, but only if the pipe is exposed to sunlight
*Answer: B — NFPA 13D Table 6.4.3.2 limits 3/4-inch CPVC branch lines to 50 feet for hydraulic
reasons.*
7. During final inspection, you see that the water flow alarm bell for the residential sprinkler system is
mounted outside but not visible from any bedroom window. Is this a violation?
A) Yes, it must be visible from the primary bedroom
B) No, only an interior alarm is required for residential
C) Yes, it must be seen by responding firefighters
D) No, as long as it can be heard inside all sleeping areas
*Answer: B — NFPA 13D requires an audible alarm inside the dwelling; an exterior bell is optional in
one- and two-family dwellings.*
8. A builder proposes to use PEX piping for a stand-alone residential fire sprinkler system. The PEX is not
listed for fire sprinkler use. What do you tell them?
