CSLB C10 TEST 1 120 2026 MOCK PAPER
COMPREHENSIVE REVIEW NOTES ANALYTICAL
SUMMARY
◉ Question #: 2: On a 480 V, three-phase blower motor with
auxiliary contacts and indicators, the push button start is off due to a
thermal overload. What is the most likely cause?
Answer: Correct answer: overloaded motor
◉ When installing a fire alarm system bell or horn, how far above
grade should it be mounted?
Answer: 7'-6"
Additional Notes: The top of the device should be at least 7'-6" above
the finished floor and at least 6" below the finished ceiling. If the
ceiling height is too low to allow the recommended mounting
heights, the device can be mounted at a lower height, or on the
ceiling.
◉ What is the minimum length of a grounding rod?
Answer: 8'
◉ When testing a GFCI trip, probe conductor and fixture ground,
use:
,Answer: inductive voltage tester
◉ On a walk-through of a new home, the owner wants you to install
an outlet beside the stove. The counter top is 48" long and the wall is
6' away. The contractor
Answer: would need to install 2 outlets
◉ What is the maximum allowed gap allowed around a box in a wall
finished with drywall?
Answer: Correct answer: 1/8"
Additional Notes: Plaster, drywall, or plasterboard surfaces must not
have gaps or open spaces greater than 1/8" at the edge of a box or
fitting.
◉ What is the minimum number of branch circuits required at each
patient bed location?
Answer: Correct answer: two; one from the emergency electrical
system and the other from the normal system
◉ When can you have an isolated ground passing through a panel
without connecting it to that panel's equipment grounding terminal
bar?
Answer: Correct answer: when you are reducing vibration and noise
on the ground
,Additional Notes: When installing an isolated ground receptacle the
insulated equipment grounding conductor is run with the circuit
conductors directly back to the main service disconnect. Metal boxes
and raceways must still be grounded.
◉ Which of the following could cause a significant increase to the
bid amount on a job at an automotive repair shop?
Answer: Correct answer: the service pit is inadequately ventilated
Additional Notes: The entire area of repair garages, up to a level of
18" above the floor, are Class I, Division 2, locations. Any depression
below floor level (such as a service pit) is also a Class I, Division 2,
location unless it is unvented in which case it may be considered a
Class I, Division 1, location and require special fittings.
◉ What would you use in a capacitive reactance circuit to balance
the circuit?
Answer: inductor
◉ Which of the following NEMA rating should be used for temporary
construction power enclosures outside?
Answer: Correct answer: NEMA 3R
Additional Notes: Enclosures with a NEMA rating of 3R is designed
for indoor or outdoor use. Enclosures with ratings of 1, 2, or 12 are
designed for indoor use only.
, ◉ What is the full-load current rating of a 208-volt, 50-horsepower,
three-phase squirrel-cage motor?
Answer: Correct answer: 103 amps
Additional Notes: To find the amperage of a three-phase motor when
you know the horsepower you use a variation of Watt's Law:
I = (horsepower x 746 watts/horsepower) / (E x 1.73)
I = (50 hp x 746 watts/hp) / (208 volts x 1.73) = 37,300 watts / 360
volts = 103 amps
◉ When connecting conduit in a hazardous area, what do you use in
order to prevent the passage of gasses, vapors, or flames?
Answer: Correct answer: seal-off fitting
◉ When a house heater comes on, some lights get bright, others get
dim. What could cause this?
Answer: Correct answer: bad neutral connection
◉ What is the difference between a grounded conductor and a
grounding conductor?
Answer: Correct answer: a grounded conductor is a circuit
conductor that is intentionally grounded and a grounding conductor
is a conductor that is used to connect the grounded circuit to a
grounding electrode
COMPREHENSIVE REVIEW NOTES ANALYTICAL
SUMMARY
◉ Question #: 2: On a 480 V, three-phase blower motor with
auxiliary contacts and indicators, the push button start is off due to a
thermal overload. What is the most likely cause?
Answer: Correct answer: overloaded motor
◉ When installing a fire alarm system bell or horn, how far above
grade should it be mounted?
Answer: 7'-6"
Additional Notes: The top of the device should be at least 7'-6" above
the finished floor and at least 6" below the finished ceiling. If the
ceiling height is too low to allow the recommended mounting
heights, the device can be mounted at a lower height, or on the
ceiling.
◉ What is the minimum length of a grounding rod?
Answer: 8'
◉ When testing a GFCI trip, probe conductor and fixture ground,
use:
,Answer: inductive voltage tester
◉ On a walk-through of a new home, the owner wants you to install
an outlet beside the stove. The counter top is 48" long and the wall is
6' away. The contractor
Answer: would need to install 2 outlets
◉ What is the maximum allowed gap allowed around a box in a wall
finished with drywall?
Answer: Correct answer: 1/8"
Additional Notes: Plaster, drywall, or plasterboard surfaces must not
have gaps or open spaces greater than 1/8" at the edge of a box or
fitting.
◉ What is the minimum number of branch circuits required at each
patient bed location?
Answer: Correct answer: two; one from the emergency electrical
system and the other from the normal system
◉ When can you have an isolated ground passing through a panel
without connecting it to that panel's equipment grounding terminal
bar?
Answer: Correct answer: when you are reducing vibration and noise
on the ground
,Additional Notes: When installing an isolated ground receptacle the
insulated equipment grounding conductor is run with the circuit
conductors directly back to the main service disconnect. Metal boxes
and raceways must still be grounded.
◉ Which of the following could cause a significant increase to the
bid amount on a job at an automotive repair shop?
Answer: Correct answer: the service pit is inadequately ventilated
Additional Notes: The entire area of repair garages, up to a level of
18" above the floor, are Class I, Division 2, locations. Any depression
below floor level (such as a service pit) is also a Class I, Division 2,
location unless it is unvented in which case it may be considered a
Class I, Division 1, location and require special fittings.
◉ What would you use in a capacitive reactance circuit to balance
the circuit?
Answer: inductor
◉ Which of the following NEMA rating should be used for temporary
construction power enclosures outside?
Answer: Correct answer: NEMA 3R
Additional Notes: Enclosures with a NEMA rating of 3R is designed
for indoor or outdoor use. Enclosures with ratings of 1, 2, or 12 are
designed for indoor use only.
, ◉ What is the full-load current rating of a 208-volt, 50-horsepower,
three-phase squirrel-cage motor?
Answer: Correct answer: 103 amps
Additional Notes: To find the amperage of a three-phase motor when
you know the horsepower you use a variation of Watt's Law:
I = (horsepower x 746 watts/horsepower) / (E x 1.73)
I = (50 hp x 746 watts/hp) / (208 volts x 1.73) = 37,300 watts / 360
volts = 103 amps
◉ When connecting conduit in a hazardous area, what do you use in
order to prevent the passage of gasses, vapors, or flames?
Answer: Correct answer: seal-off fitting
◉ When a house heater comes on, some lights get bright, others get
dim. What could cause this?
Answer: Correct answer: bad neutral connection
◉ What is the difference between a grounded conductor and a
grounding conductor?
Answer: Correct answer: a grounded conductor is a circuit
conductor that is intentionally grounded and a grounding conductor
is a conductor that is used to connect the grounded circuit to a
grounding electrode
