Texas Electrical Inspector Exam With
Actual Questions & Verified Answers,
Plus Explained Rationales/Expert
Verified For Guaranteed 100% Pass
2026/Latest Update/Instant Download
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1. What is the maximum number of disconnecting means allowed
for a service in a single-family dwelling?
A) 1
B) 2
C) 3
D) 4
B) 2
Rationale: The National Electrical Code (NEC) allows up to two
separate disconnecting means for a single-family dwelling
service, typically one main and one supplemental.
2. What is the minimum height for service conductors above
finished grade in a residential driveway?
A) 10 feet
B) 12 feet
C) 14 feet
D) 18 feet
B) 12 feet
Rationale: NEC requires service conductors over driveways to be
, at least 12 feet above finished grade to ensure safe clearance for
vehicles.
3. Which type of wiring method is required for damp or wet
locations?
A) NM cable
B) MC cable
C) RMC conduit
D) UF cable
C) RMC conduit
Rationale: Rigid Metal Conduit (RMC) provides physical
protection and is suitable for wet or damp locations, unlike
nonmetallic sheathed cable.
4. What is the standard ampere rating for a general-purpose
residential branch circuit?
A) 10 A
B) 15 A
C) 20 A
D) 30 A
C) 20 A
Rationale: 20-ampere circuits are standard for most residential
outlets and general-purpose receptacles to accommodate typical
household loads.
5. When installing a 240-volt branch circuit, which color combination
is correct for conductors?
A) Black and White
B) Black and Red
C) Red and White
D) Black and Green
B) Black and Red
, Rationale: A 240-volt circuit uses two hot conductors, typically
black and red, with an optional ground.
6. What is the minimum conductor size for a 20-ampere residential
branch circuit?
A) 12 AWG
B) 10 AWG
C) 14 AWG
D) 8 AWG
A) 12 AWG
Rationale: NEC specifies 12 AWG copper conductors for 20-amp
circuits to handle the current safely.
7. What is the maximum spacing for 15- and 20-ampere general-
purpose receptacles in a dwelling?
A) 4 feet
B) 6 feet
C) 12 feet
D) 10 feet
D) 10 feet
Rationale: NEC requires no point along the wall to be more than
6 feet from a receptacle, translating to a maximum spacing of 12
feet between outlets, effectively ensuring coverage every 10 feet
along walls.
8. What is the purpose of a GFCI device?
A) Overcurrent protection
B) Ground fault protection
C) Voltage regulation
D) Surge suppression
B) Ground fault protection
Rationale: Ground Fault Circuit Interrupters (GFCIs) protect
, people from electric shock by detecting ground faults and quickly
disconnecting the circuit.
9. Where are AFCI devices required in a dwelling?
A) Kitchens
B) Bathrooms
C) Bedrooms
D) Basements
C) Bedrooms
Rationale: Arc-Fault Circuit Interrupters (AFCIs) are required in
bedrooms to reduce the risk of fires caused by arcing faults in
wiring.
10. What is the minimum depth for a residential underground
branch circuit in a trench using PVC conduit?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
B) 18 inches
Rationale: NEC specifies a minimum of 18 inches for residential
branch circuits in PVC conduit to provide protection from
accidental contact.
11. What is the maximum voltage drop recommended for
feeders and branch circuits?
A) 1%
B) 3%
C) 5%
D) 10%
B) 3%
Rationale: NEC recommends a maximum 3% voltage drop for
Actual Questions & Verified Answers,
Plus Explained Rationales/Expert
Verified For Guaranteed 100% Pass
2026/Latest Update/Instant Download
1. What is the maximum number of disconnecting means allowed
for a service in a single-family dwelling?
A) 1
B) 2
C) 3
D) 4
B) 2
Rationale: The National Electrical Code (NEC) allows up to two
separate disconnecting means for a single-family dwelling
service, typically one main and one supplemental.
2. What is the minimum height for service conductors above
finished grade in a residential driveway?
A) 10 feet
B) 12 feet
C) 14 feet
D) 18 feet
B) 12 feet
Rationale: NEC requires service conductors over driveways to be
, at least 12 feet above finished grade to ensure safe clearance for
vehicles.
3. Which type of wiring method is required for damp or wet
locations?
A) NM cable
B) MC cable
C) RMC conduit
D) UF cable
C) RMC conduit
Rationale: Rigid Metal Conduit (RMC) provides physical
protection and is suitable for wet or damp locations, unlike
nonmetallic sheathed cable.
4. What is the standard ampere rating for a general-purpose
residential branch circuit?
A) 10 A
B) 15 A
C) 20 A
D) 30 A
C) 20 A
Rationale: 20-ampere circuits are standard for most residential
outlets and general-purpose receptacles to accommodate typical
household loads.
5. When installing a 240-volt branch circuit, which color combination
is correct for conductors?
A) Black and White
B) Black and Red
C) Red and White
D) Black and Green
B) Black and Red
, Rationale: A 240-volt circuit uses two hot conductors, typically
black and red, with an optional ground.
6. What is the minimum conductor size for a 20-ampere residential
branch circuit?
A) 12 AWG
B) 10 AWG
C) 14 AWG
D) 8 AWG
A) 12 AWG
Rationale: NEC specifies 12 AWG copper conductors for 20-amp
circuits to handle the current safely.
7. What is the maximum spacing for 15- and 20-ampere general-
purpose receptacles in a dwelling?
A) 4 feet
B) 6 feet
C) 12 feet
D) 10 feet
D) 10 feet
Rationale: NEC requires no point along the wall to be more than
6 feet from a receptacle, translating to a maximum spacing of 12
feet between outlets, effectively ensuring coverage every 10 feet
along walls.
8. What is the purpose of a GFCI device?
A) Overcurrent protection
B) Ground fault protection
C) Voltage regulation
D) Surge suppression
B) Ground fault protection
Rationale: Ground Fault Circuit Interrupters (GFCIs) protect
, people from electric shock by detecting ground faults and quickly
disconnecting the circuit.
9. Where are AFCI devices required in a dwelling?
A) Kitchens
B) Bathrooms
C) Bedrooms
D) Basements
C) Bedrooms
Rationale: Arc-Fault Circuit Interrupters (AFCIs) are required in
bedrooms to reduce the risk of fires caused by arcing faults in
wiring.
10. What is the minimum depth for a residential underground
branch circuit in a trench using PVC conduit?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
B) 18 inches
Rationale: NEC specifies a minimum of 18 inches for residential
branch circuits in PVC conduit to provide protection from
accidental contact.
11. What is the maximum voltage drop recommended for
feeders and branch circuits?
A) 1%
B) 3%
C) 5%
D) 10%
B) 3%
Rationale: NEC recommends a maximum 3% voltage drop for
