LADWP ELECTRICAL HELPER EXAM – QUESTIONS AND ANSWERS | VERIFIED
AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS |
LATEST EXAM UPDATE 2026/2027
Core Domains
Basic Electrical Theory (Ohm’s Law, AC/DC, Circuits)
Electrical Safety and Personal Protective Equipment (PPE)
Tools, Equipment, and Material Identification
Reading and Interpreting Blueprints, Schematics, and Diagrams
National Electrical Code (NEC) Standards and Compliance
Pole Climbing, Rigging, and Overhead Line Procedures
Underground Distribution Systems and Cable Identification
Math, Measurement, and Calculation for Electrical Work
First Aid, CPR, and Emergency Response
Professional Conduct, Ethics, and Communication
Introduction
This comprehensive examination is designed to rigorously assess the foundational
knowledge, practical skills, and critical decision-making abilities required of an
Electrical Helper. The test covers a wide range of essential topics, from core electrical
theory and safety protocols to the practical application of industry standards like
the NEC. Through a mix of direct knowledge questions and complex, scenario-based
problems, candidates will be challenged to demonstrate not only their
understanding of the material but also their ability to apply it in real-world, on-the-
job situations. Success on this exam indicates a strong readiness to perform duties
safely and effectively under the guidance of a journey-level electrician.
,════════════════════════════════════
SECTION ONE: QUESTIONS 1–50
════════════════════════════════════
1. What is the primary purpose of a ground fault circuit interrupter (GFCI)?
A. To protect the electrical system from lightning strikes
B. To prevent electrical fires caused by overloaded circuits
C. To protect people from electric shock by interrupting the circuit when a fault is
detected
D. To ensure a stable voltage supply to sensitive electronic equipment
🟢 Correct Answer: C. To protect people from electric shock by interrupting the
circuit when a fault is detected
🔴 Explanation: A GFCI monitors the current flowing on the hot and neutral
conductors. If it detects an imbalance (a ground fault), it trips almost instantly to
prevent a fatal shock, which is its primary purpose for personnel safety.
2. In a series circuit, if one resistor fails open, what happens to the entire
circuit?
A. The circuit remains operational, but with higher resistance
B. The circuit will continue to function normally
C. The entire circuit will stop functioning
D. Only the failed component will stop working, all others will remain on
🟢 Correct Answer: C. The entire circuit will stop functioning
🔴 Explanation: In a series circuit, there is only one path for current to flow. If that
path is broken by an open component, current flow stops entirely, and all
components in the series cease to operate.
,3. What type of personal protective equipment (PPE) is essential for an
electrical helper when working on energized equipment over 50 volts?
A. Safety glasses and a hard hat only
B. Leather gloves and steel-toe boots
C. Rubber insulating gloves and a face shield
D. A standard fire-resistant vest
🟢 Correct Answer: C. Rubber insulating gloves and a face shield
🔴 Explanation: OSHA and industry standards require workers to use rubber
insulating gloves and a face shield or arc-rated hood for protection against
electrical shock and arc flash when working on or near exposed energized parts
over 50 volts.
4. What is the standard voltage drop percentage allowed by the NEC for branch
circuit conductors?
A. 1%
B. 3%
C. 5%
D. 10%
🟢 Correct Answer: B. 3%
🔴 Explanation: The NEC recommends (but does not mandate) that branch circuit
voltage drop be limited to 3% and the total feeder and branch circuit drop to 5%
for efficiency and performance. The 3% figure is the standard value used for
branch circuits.
5. What is the function of a fuse in an electrical circuit?
A. To control the flow of electricity
B. To convert AC to DC current
, C. To provide overcurrent protection by melting and opening the circuit
D. To step down voltage for small appliances
🟢 Correct Answer: C. To provide overcurrent protection by melting and opening
the circuit
🔴 Explanation: A fuse is a protective device containing a metal strip that melts
and breaks the circuit when current exceeds its rated value. This action interrupts
the flow of electricity to prevent damage to equipment and reduce fire hazards.
6. A helper is tasked with pulling a new cable through an existing conduit.
What is the most important first step?
A. Lubricate the cable heavily
B. Ensure the conduit is clear of obstructions and debris
C. Attach a pulling rope directly to the cable's connector
D. Apply maximum tension to the pulling rope from the start
🟢 Correct Answer: B. Ensure the conduit is clear of obstructions and debris
🔴 Explanation: Before attempting a cable pull, it is critical to verify that the
conduit is clear using a fish tape or mandrel. Debris, bends, or damage can cause
the cable to bind or become damaged, leading to a failed pull or a compromised
installation.
7. According to Ohm’s Law, what is the current in a circuit with 120 volts and 30
ohms of resistance?
A. 0.25 amps
B. 4 amps
C. 150 amps
D. 3600 amps
🟢 Correct Answer: B. 4 amps
AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS |
LATEST EXAM UPDATE 2026/2027
Core Domains
Basic Electrical Theory (Ohm’s Law, AC/DC, Circuits)
Electrical Safety and Personal Protective Equipment (PPE)
Tools, Equipment, and Material Identification
Reading and Interpreting Blueprints, Schematics, and Diagrams
National Electrical Code (NEC) Standards and Compliance
Pole Climbing, Rigging, and Overhead Line Procedures
Underground Distribution Systems and Cable Identification
Math, Measurement, and Calculation for Electrical Work
First Aid, CPR, and Emergency Response
Professional Conduct, Ethics, and Communication
Introduction
This comprehensive examination is designed to rigorously assess the foundational
knowledge, practical skills, and critical decision-making abilities required of an
Electrical Helper. The test covers a wide range of essential topics, from core electrical
theory and safety protocols to the practical application of industry standards like
the NEC. Through a mix of direct knowledge questions and complex, scenario-based
problems, candidates will be challenged to demonstrate not only their
understanding of the material but also their ability to apply it in real-world, on-the-
job situations. Success on this exam indicates a strong readiness to perform duties
safely and effectively under the guidance of a journey-level electrician.
,════════════════════════════════════
SECTION ONE: QUESTIONS 1–50
════════════════════════════════════
1. What is the primary purpose of a ground fault circuit interrupter (GFCI)?
A. To protect the electrical system from lightning strikes
B. To prevent electrical fires caused by overloaded circuits
C. To protect people from electric shock by interrupting the circuit when a fault is
detected
D. To ensure a stable voltage supply to sensitive electronic equipment
🟢 Correct Answer: C. To protect people from electric shock by interrupting the
circuit when a fault is detected
🔴 Explanation: A GFCI monitors the current flowing on the hot and neutral
conductors. If it detects an imbalance (a ground fault), it trips almost instantly to
prevent a fatal shock, which is its primary purpose for personnel safety.
2. In a series circuit, if one resistor fails open, what happens to the entire
circuit?
A. The circuit remains operational, but with higher resistance
B. The circuit will continue to function normally
C. The entire circuit will stop functioning
D. Only the failed component will stop working, all others will remain on
🟢 Correct Answer: C. The entire circuit will stop functioning
🔴 Explanation: In a series circuit, there is only one path for current to flow. If that
path is broken by an open component, current flow stops entirely, and all
components in the series cease to operate.
,3. What type of personal protective equipment (PPE) is essential for an
electrical helper when working on energized equipment over 50 volts?
A. Safety glasses and a hard hat only
B. Leather gloves and steel-toe boots
C. Rubber insulating gloves and a face shield
D. A standard fire-resistant vest
🟢 Correct Answer: C. Rubber insulating gloves and a face shield
🔴 Explanation: OSHA and industry standards require workers to use rubber
insulating gloves and a face shield or arc-rated hood for protection against
electrical shock and arc flash when working on or near exposed energized parts
over 50 volts.
4. What is the standard voltage drop percentage allowed by the NEC for branch
circuit conductors?
A. 1%
B. 3%
C. 5%
D. 10%
🟢 Correct Answer: B. 3%
🔴 Explanation: The NEC recommends (but does not mandate) that branch circuit
voltage drop be limited to 3% and the total feeder and branch circuit drop to 5%
for efficiency and performance. The 3% figure is the standard value used for
branch circuits.
5. What is the function of a fuse in an electrical circuit?
A. To control the flow of electricity
B. To convert AC to DC current
, C. To provide overcurrent protection by melting and opening the circuit
D. To step down voltage for small appliances
🟢 Correct Answer: C. To provide overcurrent protection by melting and opening
the circuit
🔴 Explanation: A fuse is a protective device containing a metal strip that melts
and breaks the circuit when current exceeds its rated value. This action interrupts
the flow of electricity to prevent damage to equipment and reduce fire hazards.
6. A helper is tasked with pulling a new cable through an existing conduit.
What is the most important first step?
A. Lubricate the cable heavily
B. Ensure the conduit is clear of obstructions and debris
C. Attach a pulling rope directly to the cable's connector
D. Apply maximum tension to the pulling rope from the start
🟢 Correct Answer: B. Ensure the conduit is clear of obstructions and debris
🔴 Explanation: Before attempting a cable pull, it is critical to verify that the
conduit is clear using a fish tape or mandrel. Debris, bends, or damage can cause
the cable to bind or become damaged, leading to a failed pull or a compromised
installation.
7. According to Ohm’s Law, what is the current in a circuit with 120 volts and 30
ohms of resistance?
A. 0.25 amps
B. 4 amps
C. 150 amps
D. 3600 amps
🟢 Correct Answer: B. 4 amps
