CALIFORNIA STREET LIGHTING
TECHNICIAN CERTIFICATION EXAM
ACTUAL 2026 VERIFIED QUESTIONS WITH
ANSWERS COMPREHENSIVE & RATIONALE
1. A street lighting technician is assigned to install a new luminaire
on a 277-volt roadway lighting circuit. Before beginning work,
what is the first priority?
A. Install the photocell first
B. Verify the fixture catalog number
C. De-energize the circuit, apply lockout/tagout, and verify absence of
voltage
D. Inspect the roadway for traffic
Answer: C. De-energize the circuit, apply lockout/tagout, and verify
absence of voltage
Rationale: Electrical safety always takes precedence over installation
activities. Proper lockout/tagout procedures, followed by verification
using an adequately rated test instrument, protect workers from
accidental energization and comply with accepted electrical safety
practices.
2. Which conductor color is commonly used for the grounded
(neutral) conductor in a 277/480-volt street lighting system?
A. Green
B. White or gray
C. Orange
D. Blue
1
,Answer: B. White or gray
Rationale: White or gray insulation identifies grounded conductors.
Green or green with yellow stripe identifies equipment grounding
conductors, while other colors are generally reserved for ungrounded
phase conductors.
3. What is the primary purpose of a handhole in a street lighting pole?
A. Increase pole strength
B. Improve fixture cooling
C. Provide access to wiring and grounding connections
D. Support banner attachments
Answer: C. Provide access to wiring and grounding connections
Rationale: Handholes provide access for conductor splicing,
grounding connections, fuse holders, and maintenance without
removing the pole from service.
4. A photocontrol operating on a dusk-to-dawn schedule repeatedly
cycles on and off every few minutes. The most likely cause is:
A. Low pole height
B. Fixture aimed incorrectly
C. Fixture light shining directly onto the photocell
D. Excessive grounding
Answer: C. Fixture light shining directly onto the photocell
2
,Rationale: Self-cycling commonly occurs when the luminaire
illuminates the photocell, causing it to interpret the light as daylight
and repeatedly switch the fixture off and on.
5. Why are LED street lighting systems replacing high-pressure
sodium fixtures in many municipalities?
A. Lower structural weight only
B. Reduced energy consumption and longer service life
C. Lower installation height
D. Elimination of grounding
Answer: B. Reduced energy consumption and longer service life
Rationale: LED luminaires consume less energy, require less
maintenance due to long operating life, provide improved color
rendering, and offer better optical control compared with older HID
technologies.
6. Which device typically protects the branch circuit inside a street
lighting pole?
A. Motor starter
B. Pole fuse holder
C. Transformer relay
D. Variable resistor
Answer: B. Pole fuse holder
Rationale: Individual pole fuse holders protect branch conductors and
luminaires from overloads and short circuits while allowing isolation
of a single fixture without affecting the entire circuit.
3
, 7. What is the purpose of grounding a metal street lighting pole?
A. Improve brightness
B. Reduce voltage drop
C. Provide a low-impedance fault current path
D. Prevent photocell operation
Answer: C. Provide a low-impedance fault current path
Rationale: Proper grounding facilitates operation of overcurrent
protective devices during fault conditions, reducing shock hazards and
equipment damage.
8. Which instrument is best for verifying the presence of 277 volts at
a luminaire?
A. Clamp-on ammeter
B. Digital multimeter rated for the application
C. Earth resistance tester
D. Light meter
Answer: B. Digital multimeter rated for the application
Rationale: A properly rated digital multimeter accurately measures
voltage between phase and neutral while providing appropriate safety
ratings for electrical work.
9. An open neutral on a 277-volt lighting circuit will most likely
result in:
A. Increased brightness
4
TECHNICIAN CERTIFICATION EXAM
ACTUAL 2026 VERIFIED QUESTIONS WITH
ANSWERS COMPREHENSIVE & RATIONALE
1. A street lighting technician is assigned to install a new luminaire
on a 277-volt roadway lighting circuit. Before beginning work,
what is the first priority?
A. Install the photocell first
B. Verify the fixture catalog number
C. De-energize the circuit, apply lockout/tagout, and verify absence of
voltage
D. Inspect the roadway for traffic
Answer: C. De-energize the circuit, apply lockout/tagout, and verify
absence of voltage
Rationale: Electrical safety always takes precedence over installation
activities. Proper lockout/tagout procedures, followed by verification
using an adequately rated test instrument, protect workers from
accidental energization and comply with accepted electrical safety
practices.
2. Which conductor color is commonly used for the grounded
(neutral) conductor in a 277/480-volt street lighting system?
A. Green
B. White or gray
C. Orange
D. Blue
1
,Answer: B. White or gray
Rationale: White or gray insulation identifies grounded conductors.
Green or green with yellow stripe identifies equipment grounding
conductors, while other colors are generally reserved for ungrounded
phase conductors.
3. What is the primary purpose of a handhole in a street lighting pole?
A. Increase pole strength
B. Improve fixture cooling
C. Provide access to wiring and grounding connections
D. Support banner attachments
Answer: C. Provide access to wiring and grounding connections
Rationale: Handholes provide access for conductor splicing,
grounding connections, fuse holders, and maintenance without
removing the pole from service.
4. A photocontrol operating on a dusk-to-dawn schedule repeatedly
cycles on and off every few minutes. The most likely cause is:
A. Low pole height
B. Fixture aimed incorrectly
C. Fixture light shining directly onto the photocell
D. Excessive grounding
Answer: C. Fixture light shining directly onto the photocell
2
,Rationale: Self-cycling commonly occurs when the luminaire
illuminates the photocell, causing it to interpret the light as daylight
and repeatedly switch the fixture off and on.
5. Why are LED street lighting systems replacing high-pressure
sodium fixtures in many municipalities?
A. Lower structural weight only
B. Reduced energy consumption and longer service life
C. Lower installation height
D. Elimination of grounding
Answer: B. Reduced energy consumption and longer service life
Rationale: LED luminaires consume less energy, require less
maintenance due to long operating life, provide improved color
rendering, and offer better optical control compared with older HID
technologies.
6. Which device typically protects the branch circuit inside a street
lighting pole?
A. Motor starter
B. Pole fuse holder
C. Transformer relay
D. Variable resistor
Answer: B. Pole fuse holder
Rationale: Individual pole fuse holders protect branch conductors and
luminaires from overloads and short circuits while allowing isolation
of a single fixture without affecting the entire circuit.
3
, 7. What is the purpose of grounding a metal street lighting pole?
A. Improve brightness
B. Reduce voltage drop
C. Provide a low-impedance fault current path
D. Prevent photocell operation
Answer: C. Provide a low-impedance fault current path
Rationale: Proper grounding facilitates operation of overcurrent
protective devices during fault conditions, reducing shock hazards and
equipment damage.
8. Which instrument is best for verifying the presence of 277 volts at
a luminaire?
A. Clamp-on ammeter
B. Digital multimeter rated for the application
C. Earth resistance tester
D. Light meter
Answer: B. Digital multimeter rated for the application
Rationale: A properly rated digital multimeter accurately measures
voltage between phase and neutral while providing appropriate safety
ratings for electrical work.
9. An open neutral on a 277-volt lighting circuit will most likely
result in:
A. Increased brightness
4
