NCCER MODULE 6 -DEVICE BOXES,
PULL AND JUNCTION BOXES ACTUAL
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ Explosion-proof box.
Answer: Contains explosions; fire may escape.
◍ Ceiling fan box.
Answer: Must be listed for weight capacity.
◍ NEMA Box Type 1:.
Answer: General purpose- prevents accidental contact, good for indoors
when not exposed to special conditions, protects against falling dirt but is
not dust-proof.
◍ NEMA Box Type 3:.
Answer: Dust-tight, Rain-tight- Intended to provide suitable protection
against specified weather hazards, suitable for outdoor applications like
construction work
◍ NEMA Box Type 3R:.
Answer: Rain-proof, sleet resistant- protects from rain, and resists damage
from exposure to sleet, designed with conduit hubs, external mounting and
drainage
◍ NEMA Box Type 4:.
Answer: Water-tight- designed to meet hose test, 10' away for 5 minutes at
1" nozzle min 65 gallons per minute, there should be no water leakage under
these conditions
◍ Maximum weight capacity.
, Answer: 35 lb if unmarked.
◍ NEMA Box Type 4X:.
Answer: Water-tight, corrosion-resistant- same as above except that they are
made out of a highly corrosive resistant material, ideal for meat packing and
chemical plants where steel would be destroyed over time
◍ Pancake box depth.
Answer: 1/2 inch, minimum for outlet boxes.
◍ Square metal box sizes.
Answer: 4"/16" and 1/4", 1½", 2½".
◍ Square metal box depths.
Answer: Three available depths for installation.
◍ Utility box.
Answer: Single-gang box with internal mounting ears.
◍ Masonry box.
Answer: Used in flat-slab construction.
◍ NEMA Box Type 7:.
Answer: Hazardous location, class I- where flammable gasses or vapors are
or may be present in the air and could cause an explosive or ignitable
mixture, circuit interruption occurs in the air
◍ Wet location.
Answer: Washroom; exposed to moisture.
◍ Damp location.
Answer: Open porch with roof; less moisture exposure.
◍ NEMA Box Type 9:.
Answer: Hazardous location, class II- areas with combustible dust this
designation is incomplete without a letter
◍ P-rings.
Answer: Add volume to electrical boxes.
PULL AND JUNCTION BOXES ACTUAL
EXAM PAPER 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ Explosion-proof box.
Answer: Contains explosions; fire may escape.
◍ Ceiling fan box.
Answer: Must be listed for weight capacity.
◍ NEMA Box Type 1:.
Answer: General purpose- prevents accidental contact, good for indoors
when not exposed to special conditions, protects against falling dirt but is
not dust-proof.
◍ NEMA Box Type 3:.
Answer: Dust-tight, Rain-tight- Intended to provide suitable protection
against specified weather hazards, suitable for outdoor applications like
construction work
◍ NEMA Box Type 3R:.
Answer: Rain-proof, sleet resistant- protects from rain, and resists damage
from exposure to sleet, designed with conduit hubs, external mounting and
drainage
◍ NEMA Box Type 4:.
Answer: Water-tight- designed to meet hose test, 10' away for 5 minutes at
1" nozzle min 65 gallons per minute, there should be no water leakage under
these conditions
◍ Maximum weight capacity.
, Answer: 35 lb if unmarked.
◍ NEMA Box Type 4X:.
Answer: Water-tight, corrosion-resistant- same as above except that they are
made out of a highly corrosive resistant material, ideal for meat packing and
chemical plants where steel would be destroyed over time
◍ Pancake box depth.
Answer: 1/2 inch, minimum for outlet boxes.
◍ Square metal box sizes.
Answer: 4"/16" and 1/4", 1½", 2½".
◍ Square metal box depths.
Answer: Three available depths for installation.
◍ Utility box.
Answer: Single-gang box with internal mounting ears.
◍ Masonry box.
Answer: Used in flat-slab construction.
◍ NEMA Box Type 7:.
Answer: Hazardous location, class I- where flammable gasses or vapors are
or may be present in the air and could cause an explosive or ignitable
mixture, circuit interruption occurs in the air
◍ Wet location.
Answer: Washroom; exposed to moisture.
◍ Damp location.
Answer: Open porch with roof; less moisture exposure.
◍ NEMA Box Type 9:.
Answer: Hazardous location, class II- areas with combustible dust this
designation is incomplete without a letter
◍ P-rings.
Answer: Add volume to electrical boxes.
