LA County Electrical Inspector
Promotional Exam Level II Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026-2027 Q&A |
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1. What is the maximum allowable voltage drop for branch circuits in
a commercial building?
a) 2%
b) 3%
c) 5%
d) 10%
The NEC recommends that the voltage drop for branch circuits not
exceed 5% to maintain efficient operation of equipment.
2. When inspecting a service entrance, which of the following is
required for grounding?
a) Only the neutral conductor
b) Connection to an electrode such as a ground rod or metal
water pipe
c) Only the metal conduit
d) Connection to a nearby metal structure
, Service grounding ensures safety by providing a low-impedance
path for fault current to prevent shock hazards.
3. What type of wiring method is generally permitted in damp
locations?
a) Nonmetallic-sheathed cable (NM)
b) Metal-clad cable (MC)
c) Flat ribbon cable
d) Open-run NM cable
MC cable is rated for damp locations and provides mechanical
protection and grounding.
4. A 20-ampere branch circuit supplies general-purpose receptacles.
What is the minimum wire size required?
a) 12 AWG
b) 12 AWG copper
c) 14 AWG aluminum
d) 10 AWG copper
12 AWG copper is the NEC minimum for 20-ampere circuits to
prevent overheating.
5. Which of the following best describes a Class 2 circuit?
a) High voltage supply line
b) Low voltage control or signal circuit
c) Emergency service circuit
d) Service entrance feeder
Class 2 circuits are limited to power and energy levels low enough
to reduce the risk of fire or shock.
6. When inspecting a grounding electrode system, what is a required
inspection item?
, a) Conduit fill
b) Continuity and proper bonding of electrodes
c) Voltage drop
d) Wire color
Proper bonding and continuity are essential for safe fault current
conduction.
7. Which is the primary purpose of GFCI protection?
a) Prevent fire
b) Protect appliances
c) Prevent shock from ground faults
d) Reduce voltage drop
GFCI devices detect current leakage to ground and trip to protect
people from shock.
8. A feeder is rated 100 amperes. What is the minimum conductor
size for copper conductors in a building?
a) 1 AWG
b) 2 AWG
c) 3 AWG
d) 4 AWG
According to the NEC ampacity tables, 3 AWG copper is typically
rated for 100A in typical insulation conditions.
9. Which device is required to protect a 120-volt, 20-ampere
general-use branch circuit?
a) Fuse
b) Circuit breaker
c) Transformer
d) Disconnect switch
Promotional Exam Level II Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026-2027 Q&A |
Instant Download Pdf
1. What is the maximum allowable voltage drop for branch circuits in
a commercial building?
a) 2%
b) 3%
c) 5%
d) 10%
The NEC recommends that the voltage drop for branch circuits not
exceed 5% to maintain efficient operation of equipment.
2. When inspecting a service entrance, which of the following is
required for grounding?
a) Only the neutral conductor
b) Connection to an electrode such as a ground rod or metal
water pipe
c) Only the metal conduit
d) Connection to a nearby metal structure
, Service grounding ensures safety by providing a low-impedance
path for fault current to prevent shock hazards.
3. What type of wiring method is generally permitted in damp
locations?
a) Nonmetallic-sheathed cable (NM)
b) Metal-clad cable (MC)
c) Flat ribbon cable
d) Open-run NM cable
MC cable is rated for damp locations and provides mechanical
protection and grounding.
4. A 20-ampere branch circuit supplies general-purpose receptacles.
What is the minimum wire size required?
a) 12 AWG
b) 12 AWG copper
c) 14 AWG aluminum
d) 10 AWG copper
12 AWG copper is the NEC minimum for 20-ampere circuits to
prevent overheating.
5. Which of the following best describes a Class 2 circuit?
a) High voltage supply line
b) Low voltage control or signal circuit
c) Emergency service circuit
d) Service entrance feeder
Class 2 circuits are limited to power and energy levels low enough
to reduce the risk of fire or shock.
6. When inspecting a grounding electrode system, what is a required
inspection item?
, a) Conduit fill
b) Continuity and proper bonding of electrodes
c) Voltage drop
d) Wire color
Proper bonding and continuity are essential for safe fault current
conduction.
7. Which is the primary purpose of GFCI protection?
a) Prevent fire
b) Protect appliances
c) Prevent shock from ground faults
d) Reduce voltage drop
GFCI devices detect current leakage to ground and trip to protect
people from shock.
8. A feeder is rated 100 amperes. What is the minimum conductor
size for copper conductors in a building?
a) 1 AWG
b) 2 AWG
c) 3 AWG
d) 4 AWG
According to the NEC ampacity tables, 3 AWG copper is typically
rated for 100A in typical insulation conditions.
9. Which device is required to protect a 120-volt, 20-ampere
general-use branch circuit?
a) Fuse
b) Circuit breaker
c) Transformer
d) Disconnect switch
