CSLB C10 TEST 1 | 120 Questions
and Answers (Verified Answers)
1. What is the minimum working clearance from an electrical panel
under 600 V?
A) 24"
B) 36%
C) 36" (Correct)
D) 48"
Explanation: NEC requires a minimum working space of 36 inches
in front of electrical panels operating under 600 V to ensure safety
and accessibility.
2. Voltage drop in wire is a function of:
A) Wire gauge, Length of wire, Current flow in the wire (Correct)
B) Wire material, Temperature, Insulation type
C) Voltage, Power factor, Length of wire
, D) None of the above
Explanation: Voltage drop depends on wire gauge, length, and
current flowing through the wire, affecting the voltage delivered
at the load.
3. A 12-volt direct current, 13-watt fluorescent light is controlled by a
photocell. The average daily on-time is 12 hours per day. How many
watt-hours are consumed by the light on an average day?
A) 156 (Correct)
B) 1560
C) 13
D) 15600
Explanation: Watt-hours = Power (W) x Time (hours) = 13 W x 12
hours = 156 Wh.
4. Where may you use nonmetallic-sheathed cable?
A) Inside floors and walls (Correct)
B) Outside directly buried
C) In damp or wet locations
, D) None of the above
Explanation: NM cable is approved for indoor use inside walls and
floors but not exposed outdoor or in wet locations.
5. What is the maximum permitted distance between convenience
outlets in kitchens?
A) 6'
B) 12' (Correct)
C) 18'
D) 24'
Explanation: NEC limits the spacing of receptacles in kitchens to
no more than 12 feet apart along the countertop.
6. The minimum permitted size fixture wire is:
A) No. 16
B) No. 14
C) No. 18 (Correct)
, D) No. 12
Explanation: The minimum fixture wire size is No. 18 AWG for
standard lighting fixtures.
7. What is an Erickson coupling used for?
A) To connect two sections of rigid conduit when one section
cannot be turned (Correct)
B) To connect flexible conduit to rigid conduit
C) To join two flexible conduits
D) To connect wiring devices
Explanation: Erickson couplings are used to connect rigid conduit
sections where one section cannot be rotated for alignment.
8. The smallest size grounding conductor permitted for service
entrance is:
A) No. 6 copper
B) No. 8 copper (Correct)
C) No. 10 copper
and Answers (Verified Answers)
1. What is the minimum working clearance from an electrical panel
under 600 V?
A) 24"
B) 36%
C) 36" (Correct)
D) 48"
Explanation: NEC requires a minimum working space of 36 inches
in front of electrical panels operating under 600 V to ensure safety
and accessibility.
2. Voltage drop in wire is a function of:
A) Wire gauge, Length of wire, Current flow in the wire (Correct)
B) Wire material, Temperature, Insulation type
C) Voltage, Power factor, Length of wire
, D) None of the above
Explanation: Voltage drop depends on wire gauge, length, and
current flowing through the wire, affecting the voltage delivered
at the load.
3. A 12-volt direct current, 13-watt fluorescent light is controlled by a
photocell. The average daily on-time is 12 hours per day. How many
watt-hours are consumed by the light on an average day?
A) 156 (Correct)
B) 1560
C) 13
D) 15600
Explanation: Watt-hours = Power (W) x Time (hours) = 13 W x 12
hours = 156 Wh.
4. Where may you use nonmetallic-sheathed cable?
A) Inside floors and walls (Correct)
B) Outside directly buried
C) In damp or wet locations
, D) None of the above
Explanation: NM cable is approved for indoor use inside walls and
floors but not exposed outdoor or in wet locations.
5. What is the maximum permitted distance between convenience
outlets in kitchens?
A) 6'
B) 12' (Correct)
C) 18'
D) 24'
Explanation: NEC limits the spacing of receptacles in kitchens to
no more than 12 feet apart along the countertop.
6. The minimum permitted size fixture wire is:
A) No. 16
B) No. 14
C) No. 18 (Correct)
, D) No. 12
Explanation: The minimum fixture wire size is No. 18 AWG for
standard lighting fixtures.
7. What is an Erickson coupling used for?
A) To connect two sections of rigid conduit when one section
cannot be turned (Correct)
B) To connect flexible conduit to rigid conduit
C) To join two flexible conduits
D) To connect wiring devices
Explanation: Erickson couplings are used to connect rigid conduit
sections where one section cannot be rotated for alignment.
8. The smallest size grounding conductor permitted for service
entrance is:
A) No. 6 copper
B) No. 8 copper (Correct)
C) No. 10 copper
