LADWP Electrical Craft Helper Ultimate Exam Prep |
Complete Exam Question Bank with Verified
Answers & Detailed Rationales | Latest 2026/2027
Edition – Los Angeles Department of Water and
Power | Already Graded A+
SECTION 1: ELECTRICAL SAFETY & LOCKOUT/TAGOUT
**Question 1**
Before an Electrical Craft Helper begins assisting with maintenance on a motor that is
believed to be de-energized, which procedure provides the most reliable protection
against unexpected energization?
A. Turn the disconnect off and immediately begin work
B. Notify nearby employees that the motor is off
C. Open the disconnect, apply the required lockout/tagout controls, and verify absence
of voltage using an appropriate test procedure
D. Ask another employee whether the motor is normally energized
**Answer: C**
**Rationale:** Lockout/tagout controls prevent unauthorized re-energization, while
verification establishes that the circuit is actually de-energized. Merely switching a
disconnect off or notifying coworkers does not adequately protect a worker from
unexpected energization.
---
**Question 2**
,A crew is preparing to work inside an electrical cabinet. The disconnect has been
switched OFF, but no lock or tag has been applied. What is the safest assumption
regarding the circuit?
A. The circuit is safe because the disconnect is visibly in the OFF position
B. The circuit is safe if a coworker says nobody has energized it
C. The circuit should be treated as energized until proper deenergization and
verification procedures have been completed
D. The circuit is safe if the equipment's indicator light is off
**Answer: C**
**Rationale:** A switch being in the OFF position does not by itself establish a verified
electrically safe condition. Proper procedures require the energy source to be isolated
and the absence of voltage verified with appropriate test equipment by a properly
qualified person.
---
**Question 3**
What is the primary purpose of lockout/tagout when electrical equipment is being
serviced?
A. To speed up the maintenance process
B. To prevent unauthorized or accidental re-energization of equipment
C. To identify the equipment owner
D. To record maintenance history
**Answer: B**
,**Rationale:** The primary purpose of lockout/tagout is to prevent unexpected
energization or startup of machinery and equipment, which could cause injury to
workers.
---
**Question 4**
Before beginning work on a circuit that is believed to be de-energized, which
procedure provides the most reliable verification that the circuit is actually safe to
work on?
A. Turn off the wall switch and visually inspect the equipment
B. Ask another employee whether the circuit is normally energized
C. Open the disconnect, apply the required lockout/tagout controls, and test for
absence of voltage using an appropriately rated meter
D. Remove the circuit breaker cover and look for an open conductor
**Answer: C**
**Rationale:** De-energization must be positively established rather than assumed.
Proper isolation, lockout/tagout, and verification with an appropriately rated test
instrument reduce the possibility of contact with an unexpectedly energized conductor.
---
**Question 5**
Who is authorized to apply and remove lockout/tagout devices?
A. Any worker on the jobsite
B. The supervisor only
, C. The authorized employee performing the maintenance or repair
D. The equipment manufacturer
**Answer: C**
**Rationale:** Only the authorized employee who applied the lockout/tagout device is
permitted to remove it. This ensures that the worker is aware that the equipment has
been restored to an energized state.
---
**Question 6**
If multiple workers are servicing the same piece of equipment, how should
lockout/tagout be applied?
A. Each worker applies their own personal lock and tag
B. One worker applies a single lock for the entire group
C. The supervisor applies a single lock
D. No lockout is required if multiple workers are present
**Answer: A**
**Rationale:** Each worker must apply their own personal lock and tag to the energy-
isolating device. This ensures that the equipment cannot be re-energized until every
worker has removed their lock.
---
**Question 7**
Complete Exam Question Bank with Verified
Answers & Detailed Rationales | Latest 2026/2027
Edition – Los Angeles Department of Water and
Power | Already Graded A+
SECTION 1: ELECTRICAL SAFETY & LOCKOUT/TAGOUT
**Question 1**
Before an Electrical Craft Helper begins assisting with maintenance on a motor that is
believed to be de-energized, which procedure provides the most reliable protection
against unexpected energization?
A. Turn the disconnect off and immediately begin work
B. Notify nearby employees that the motor is off
C. Open the disconnect, apply the required lockout/tagout controls, and verify absence
of voltage using an appropriate test procedure
D. Ask another employee whether the motor is normally energized
**Answer: C**
**Rationale:** Lockout/tagout controls prevent unauthorized re-energization, while
verification establishes that the circuit is actually de-energized. Merely switching a
disconnect off or notifying coworkers does not adequately protect a worker from
unexpected energization.
---
**Question 2**
,A crew is preparing to work inside an electrical cabinet. The disconnect has been
switched OFF, but no lock or tag has been applied. What is the safest assumption
regarding the circuit?
A. The circuit is safe because the disconnect is visibly in the OFF position
B. The circuit is safe if a coworker says nobody has energized it
C. The circuit should be treated as energized until proper deenergization and
verification procedures have been completed
D. The circuit is safe if the equipment's indicator light is off
**Answer: C**
**Rationale:** A switch being in the OFF position does not by itself establish a verified
electrically safe condition. Proper procedures require the energy source to be isolated
and the absence of voltage verified with appropriate test equipment by a properly
qualified person.
---
**Question 3**
What is the primary purpose of lockout/tagout when electrical equipment is being
serviced?
A. To speed up the maintenance process
B. To prevent unauthorized or accidental re-energization of equipment
C. To identify the equipment owner
D. To record maintenance history
**Answer: B**
,**Rationale:** The primary purpose of lockout/tagout is to prevent unexpected
energization or startup of machinery and equipment, which could cause injury to
workers.
---
**Question 4**
Before beginning work on a circuit that is believed to be de-energized, which
procedure provides the most reliable verification that the circuit is actually safe to
work on?
A. Turn off the wall switch and visually inspect the equipment
B. Ask another employee whether the circuit is normally energized
C. Open the disconnect, apply the required lockout/tagout controls, and test for
absence of voltage using an appropriately rated meter
D. Remove the circuit breaker cover and look for an open conductor
**Answer: C**
**Rationale:** De-energization must be positively established rather than assumed.
Proper isolation, lockout/tagout, and verification with an appropriately rated test
instrument reduce the possibility of contact with an unexpectedly energized conductor.
---
**Question 5**
Who is authorized to apply and remove lockout/tagout devices?
A. Any worker on the jobsite
B. The supervisor only
, C. The authorized employee performing the maintenance or repair
D. The equipment manufacturer
**Answer: C**
**Rationale:** Only the authorized employee who applied the lockout/tagout device is
permitted to remove it. This ensures that the worker is aware that the equipment has
been restored to an energized state.
---
**Question 6**
If multiple workers are servicing the same piece of equipment, how should
lockout/tagout be applied?
A. Each worker applies their own personal lock and tag
B. One worker applies a single lock for the entire group
C. The supervisor applies a single lock
D. No lockout is required if multiple workers are present
**Answer: A**
**Rationale:** Each worker must apply their own personal lock and tag to the energy-
isolating device. This ensures that the equipment cannot be re-energized until every
worker has removed their lock.
---
**Question 7**
