NYC MASTER ELECTRICIAN EXAM| 230
QUESTIONS| WITH COMPLETE SOLUTIONS
Course
MASTER ELECTRICIAN
1. Question:
What is the maximum allowable length for a flexible cord used to supply power to
portable equipment?
A. 25 feet
B. 50 feet
C. 100 feet
D. 200 feet
Answer: C. 100 feet
Rationale: The National Electrical Code (NEC) allows flexible cords to be up to 100 feet in
length for most applications. Exceeding this length can lead to voltage drop and safety issues.
2. Question:
Which of the following devices is required to protect a feeder supplying a multi-family
dwelling?
A. Circuit breaker
B. Ground fault circuit interrupter (GFCI)
C. Arc fault circuit interrupter (AFCI)
D. Overcurrent protection device
Answer: D. Overcurrent protection device
Rationale: All feeders supplying power to multi-family dwellings must have overcurrent
protection devices to protect against overloads and short circuits, ensuring the safety of the
electrical system.
3. Question:
What is the minimum height requirement for overhead service conductors above
residential driveways?
A. 10 feet
B. 12 feet
C. 14 feet
, D. 18 feet
Answer: B. 12 feet
Rationale: The NEC specifies that overhead service conductors must be at least 12 feet
above driveways to prevent accidental contact with vehicles and to ensure safety.
4. Question:
What is the purpose of a grounding electrode system in electrical installations?
A. To provide a return path for current
B. To protect against lightning strikes
C. To prevent electric shock and provide overcurrent protection
D. To stabilize voltage levels in the system
Answer: C. To prevent electric shock and provide overcurrent protection
Rationale: The grounding electrode system serves to safely dissipate fault currents into the
ground, reducing the risk of electric shock and ensuring the safety of the electrical system.
5. Question:
In NYC, which code governs the installation of electrical work?
A. National Fire Protection Association (NFPA)
B. New York City Electrical Code
C. American National Standards Institute (ANSI)
D. Underwriters Laboratories (UL)
Answer: B. New York City Electrical Code
Rationale: The New York City Electrical Code is the governing code for all electrical
installations in NYC, incorporating NEC provisions and local amendments specific to the
city.
6. Question:
What is the minimum wire size required for a 20 amp branch circuit supplying general
purpose receptacles?
A. 12 AWG
B. 14 AWG
C. 10 AWG
, D. 8 AWG
Answer: A. 12 AWG
Rationale: According to NEC requirements, a minimum of 12 AWG copper wire is required
for a 20 amp circuit to safely carry the load without overheating.
7. Question:
When installing a new electrical panel in a residential building, what is the minimum
working space required in front of the panel?
A. 30 inches wide by 36 inches deep
B. 24 inches wide by 30 inches deep
C. 36 inches wide by 48 inches deep
D. 30 inches wide by 24 inches deep
Answer: A. 30 inches wide by 36 inches deep
Rationale: The NEC mandates that there must be a minimum working space of 30 inches
wide and 36 inches deep in front of the electrical panel to ensure safe access for maintenance
and operation.
8. Question:
Which of the following is NOT an acceptable method for securing electrical cables in a
residential installation?
A. Cable staples
B. Cable ties
C. Metal straps
D. Electrical tape
Answer: D. Electrical tape
Rationale: Electrical tape is not an acceptable method for securing electrical cables. While it
may be used for insulation, proper cable staples, ties, or straps are necessary for securing
cables to prevent movement and damage.
9. Question:
What is the minimum number of branch circuits required for a dwelling unit with a
kitchen, based on NEC requirements?
, A. 1
B. 2
C. 3
D. 4
Answer: B. 2
Rationale: The NEC requires a minimum of two 20 amp branch circuits to supply kitchen
receptacles in dwelling units to ensure adequate power for kitchen appliances and safety.
10. Question:
In a residential installation, which of the following grounding methods is typically used
for non-metallic sheathed cable?
A. Grounding through the conduit
B. Grounding using a separate grounding wire
C. Grounding through the neutral conductor
D. Grounding through the service entrance
Answer: B. Grounding using a separate grounding wire
Rationale: Non-metallic sheathed cable (such as Romex) does not have a grounding
conductor built into it, so a separate grounding wire is required for proper grounding and
safety in residential installations.
11. Question:
What is the minimum vertical clearance for overhead service conductors over
residential rooftops?
A. 10 feet
B. 12 feet
C. 18 feet
D. 24 feet
Answer: B. 12 feet
Rationale: The NEC requires a minimum clearance of 12 feet over residential rooftops to
prevent accidental contact and ensure safety.
12. Question:
Which of the following statements about AFCI (Arc Fault Circuit Interrupter) breakers
is true?
QUESTIONS| WITH COMPLETE SOLUTIONS
Course
MASTER ELECTRICIAN
1. Question:
What is the maximum allowable length for a flexible cord used to supply power to
portable equipment?
A. 25 feet
B. 50 feet
C. 100 feet
D. 200 feet
Answer: C. 100 feet
Rationale: The National Electrical Code (NEC) allows flexible cords to be up to 100 feet in
length for most applications. Exceeding this length can lead to voltage drop and safety issues.
2. Question:
Which of the following devices is required to protect a feeder supplying a multi-family
dwelling?
A. Circuit breaker
B. Ground fault circuit interrupter (GFCI)
C. Arc fault circuit interrupter (AFCI)
D. Overcurrent protection device
Answer: D. Overcurrent protection device
Rationale: All feeders supplying power to multi-family dwellings must have overcurrent
protection devices to protect against overloads and short circuits, ensuring the safety of the
electrical system.
3. Question:
What is the minimum height requirement for overhead service conductors above
residential driveways?
A. 10 feet
B. 12 feet
C. 14 feet
, D. 18 feet
Answer: B. 12 feet
Rationale: The NEC specifies that overhead service conductors must be at least 12 feet
above driveways to prevent accidental contact with vehicles and to ensure safety.
4. Question:
What is the purpose of a grounding electrode system in electrical installations?
A. To provide a return path for current
B. To protect against lightning strikes
C. To prevent electric shock and provide overcurrent protection
D. To stabilize voltage levels in the system
Answer: C. To prevent electric shock and provide overcurrent protection
Rationale: The grounding electrode system serves to safely dissipate fault currents into the
ground, reducing the risk of electric shock and ensuring the safety of the electrical system.
5. Question:
In NYC, which code governs the installation of electrical work?
A. National Fire Protection Association (NFPA)
B. New York City Electrical Code
C. American National Standards Institute (ANSI)
D. Underwriters Laboratories (UL)
Answer: B. New York City Electrical Code
Rationale: The New York City Electrical Code is the governing code for all electrical
installations in NYC, incorporating NEC provisions and local amendments specific to the
city.
6. Question:
What is the minimum wire size required for a 20 amp branch circuit supplying general
purpose receptacles?
A. 12 AWG
B. 14 AWG
C. 10 AWG
, D. 8 AWG
Answer: A. 12 AWG
Rationale: According to NEC requirements, a minimum of 12 AWG copper wire is required
for a 20 amp circuit to safely carry the load without overheating.
7. Question:
When installing a new electrical panel in a residential building, what is the minimum
working space required in front of the panel?
A. 30 inches wide by 36 inches deep
B. 24 inches wide by 30 inches deep
C. 36 inches wide by 48 inches deep
D. 30 inches wide by 24 inches deep
Answer: A. 30 inches wide by 36 inches deep
Rationale: The NEC mandates that there must be a minimum working space of 30 inches
wide and 36 inches deep in front of the electrical panel to ensure safe access for maintenance
and operation.
8. Question:
Which of the following is NOT an acceptable method for securing electrical cables in a
residential installation?
A. Cable staples
B. Cable ties
C. Metal straps
D. Electrical tape
Answer: D. Electrical tape
Rationale: Electrical tape is not an acceptable method for securing electrical cables. While it
may be used for insulation, proper cable staples, ties, or straps are necessary for securing
cables to prevent movement and damage.
9. Question:
What is the minimum number of branch circuits required for a dwelling unit with a
kitchen, based on NEC requirements?
, A. 1
B. 2
C. 3
D. 4
Answer: B. 2
Rationale: The NEC requires a minimum of two 20 amp branch circuits to supply kitchen
receptacles in dwelling units to ensure adequate power for kitchen appliances and safety.
10. Question:
In a residential installation, which of the following grounding methods is typically used
for non-metallic sheathed cable?
A. Grounding through the conduit
B. Grounding using a separate grounding wire
C. Grounding through the neutral conductor
D. Grounding through the service entrance
Answer: B. Grounding using a separate grounding wire
Rationale: Non-metallic sheathed cable (such as Romex) does not have a grounding
conductor built into it, so a separate grounding wire is required for proper grounding and
safety in residential installations.
11. Question:
What is the minimum vertical clearance for overhead service conductors over
residential rooftops?
A. 10 feet
B. 12 feet
C. 18 feet
D. 24 feet
Answer: B. 12 feet
Rationale: The NEC requires a minimum clearance of 12 feet over residential rooftops to
prevent accidental contact and ensure safety.
12. Question:
Which of the following statements about AFCI (Arc Fault Circuit Interrupter) breakers
is true?
