NYC MASTER ELECTRICIAN EXAM| 230
QUESTIONS| WITH COMPLETE SOLUTIONS
Course
MASTER ELECTRICIAN
Question 1:
What is the minimum height for overhead service conductors above a residential
driveway?
A) 10 feet
B) 12 feet
C) 14 feet
D) 18 feet
Answer: B) 12 feet
Rationale: According to the NYC Electrical Code, overhead service conductors must be at
least 12 feet above driveways to ensure safety and prevent contact with vehicles.
Question 2:
Which of the following devices is required for the protection of a branch circuit
supplying a pool pump?
A) GFCI
B) Circuit breaker
C) Fuse
D) Surge protector
Answer: A) GFCI
Rationale: Ground Fault Circuit Interrupters (GFCIs) are required for circuits supplying pool
equipment to protect against electrical shock hazards due to wet environments.
Question 3:
What is the purpose of using a bonding jumper?
A) To increase voltage
B) To reduce resistance
C) To connect non-current-carrying metal parts
D) To create a parallel circuit
Answer: C) To connect non-current-carrying metal parts
Rationale: Bonding jumpers are used to ensure that non-current-carrying metal parts are
electrically connected, which helps prevent electric shock and equipment damage by ensuring
all metallic parts are at the same potential.
,Question 4:
In NYC, what is the maximum number of 90-degree bends allowed in a conduit run
without a pull box?
A) One
B) Two
C) Three
D) Four
Answer: C) Three
Rationale: The National Electrical Code (NEC) allows a maximum of three 90-degree bends
in a conduit run without the need for a pull box to facilitate wire pulling and reduce stress on
the conductors.
Question 5:
What is the NEC maximum allowable ampacity for a 12 AWG copper conductor in a
residential setting?
A) 15 A
B) 20 A
C) 25 A
D) 30 A
Answer: B) 20 A
Rationale: A 12 AWG copper conductor has a maximum ampacity of 20 amps for general
use in residential applications, according to NEC guidelines.
Question 6:
What is the required minimum depth for underground feeder (UF) cable buried in
direct earth?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B) 18 inches
Rationale: Underground feeder (UF) cable must be buried at a minimum depth of 18 inches
when directly buried in the earth to protect it from physical damage.
Question 7:
,Which of the following is NOT considered a grounding electrode?
A) Ground rod
B) Metal water pipe
C) Concrete-encased electrode
D) Light switch
Answer: D) Light switch
Rationale: A light switch is a device used to control lighting and does not serve as a
grounding electrode. Grounding electrodes include ground rods, metal water pipes, and
concrete-encased electrodes.
Question 8:
What is the minimum size ground wire required for a 200-amp service with aluminum
conductors?
A) #4 AWG
B) #6 AWG
C) #8 AWG
D) #10 AWG
Answer: A) #4 AWG
Rationale: For a 200-amp service using aluminum conductors, the NEC requires a minimum
ground wire size of #4 AWG to ensure adequate grounding and safety.
Question 9:
In a commercial building, what is the minimum number of circuits required for general
lighting?
A) One
B) Two
C) Three
D) Four
Answer: B) Two
Rationale: According to the NYC Electrical Code, a minimum of two circuits is typically
required for general lighting in commercial spaces to provide redundancy and prevent total
failure of the lighting system.
Question 10:
What is the primary purpose of an overcurrent protection device (OCPD)?
A) To increase current flow
B) To protect against ground faults
, C) To prevent excessive current from damaging equipment
D) To regulate voltage
Answer: C) To prevent excessive current from damaging equipment
Rationale: Overcurrent protection devices, such as fuses and circuit breakers, are designed to
protect electrical circuits and equipment from damage caused by excessive current flow due
to overloads or short circuits.
Question 11:
What is the purpose of a service disconnect?
A) To regulate voltage
B) To provide a means to isolate the service equipment
C) To increase current capacity
D) To reduce resistance
Answer: B) To provide a means to isolate the service equipment
Rationale: A service disconnect is required to allow for the safe isolation of the electrical
service, enabling maintenance or emergency shut-off.
Question 12:
What is the maximum allowable length for a flexible metal conduit (FMC) run without
support?
A) 3 feet
B) 6 feet
C) 10 feet
D) 15 feet
Answer: B) 6 feet
Rationale: According to the NEC, flexible metal conduit (FMC) must be supported at
intervals not exceeding 6 feet to prevent sagging and physical damage.
Question 13:
What type of wiring method is typically used in residential construction for branch
circuits?
A) Conduit wiring
B) Cable assemblies
C) Busway systems
D) Open wiring
Answer: B) Cable assemblies
Rationale: Non-metallic sheathed cable (e.g., Romex) is commonly used in residential
branch circuits due to its flexibility and ease of installation.
QUESTIONS| WITH COMPLETE SOLUTIONS
Course
MASTER ELECTRICIAN
Question 1:
What is the minimum height for overhead service conductors above a residential
driveway?
A) 10 feet
B) 12 feet
C) 14 feet
D) 18 feet
Answer: B) 12 feet
Rationale: According to the NYC Electrical Code, overhead service conductors must be at
least 12 feet above driveways to ensure safety and prevent contact with vehicles.
Question 2:
Which of the following devices is required for the protection of a branch circuit
supplying a pool pump?
A) GFCI
B) Circuit breaker
C) Fuse
D) Surge protector
Answer: A) GFCI
Rationale: Ground Fault Circuit Interrupters (GFCIs) are required for circuits supplying pool
equipment to protect against electrical shock hazards due to wet environments.
Question 3:
What is the purpose of using a bonding jumper?
A) To increase voltage
B) To reduce resistance
C) To connect non-current-carrying metal parts
D) To create a parallel circuit
Answer: C) To connect non-current-carrying metal parts
Rationale: Bonding jumpers are used to ensure that non-current-carrying metal parts are
electrically connected, which helps prevent electric shock and equipment damage by ensuring
all metallic parts are at the same potential.
,Question 4:
In NYC, what is the maximum number of 90-degree bends allowed in a conduit run
without a pull box?
A) One
B) Two
C) Three
D) Four
Answer: C) Three
Rationale: The National Electrical Code (NEC) allows a maximum of three 90-degree bends
in a conduit run without the need for a pull box to facilitate wire pulling and reduce stress on
the conductors.
Question 5:
What is the NEC maximum allowable ampacity for a 12 AWG copper conductor in a
residential setting?
A) 15 A
B) 20 A
C) 25 A
D) 30 A
Answer: B) 20 A
Rationale: A 12 AWG copper conductor has a maximum ampacity of 20 amps for general
use in residential applications, according to NEC guidelines.
Question 6:
What is the required minimum depth for underground feeder (UF) cable buried in
direct earth?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B) 18 inches
Rationale: Underground feeder (UF) cable must be buried at a minimum depth of 18 inches
when directly buried in the earth to protect it from physical damage.
Question 7:
,Which of the following is NOT considered a grounding electrode?
A) Ground rod
B) Metal water pipe
C) Concrete-encased electrode
D) Light switch
Answer: D) Light switch
Rationale: A light switch is a device used to control lighting and does not serve as a
grounding electrode. Grounding electrodes include ground rods, metal water pipes, and
concrete-encased electrodes.
Question 8:
What is the minimum size ground wire required for a 200-amp service with aluminum
conductors?
A) #4 AWG
B) #6 AWG
C) #8 AWG
D) #10 AWG
Answer: A) #4 AWG
Rationale: For a 200-amp service using aluminum conductors, the NEC requires a minimum
ground wire size of #4 AWG to ensure adequate grounding and safety.
Question 9:
In a commercial building, what is the minimum number of circuits required for general
lighting?
A) One
B) Two
C) Three
D) Four
Answer: B) Two
Rationale: According to the NYC Electrical Code, a minimum of two circuits is typically
required for general lighting in commercial spaces to provide redundancy and prevent total
failure of the lighting system.
Question 10:
What is the primary purpose of an overcurrent protection device (OCPD)?
A) To increase current flow
B) To protect against ground faults
, C) To prevent excessive current from damaging equipment
D) To regulate voltage
Answer: C) To prevent excessive current from damaging equipment
Rationale: Overcurrent protection devices, such as fuses and circuit breakers, are designed to
protect electrical circuits and equipment from damage caused by excessive current flow due
to overloads or short circuits.
Question 11:
What is the purpose of a service disconnect?
A) To regulate voltage
B) To provide a means to isolate the service equipment
C) To increase current capacity
D) To reduce resistance
Answer: B) To provide a means to isolate the service equipment
Rationale: A service disconnect is required to allow for the safe isolation of the electrical
service, enabling maintenance or emergency shut-off.
Question 12:
What is the maximum allowable length for a flexible metal conduit (FMC) run without
support?
A) 3 feet
B) 6 feet
C) 10 feet
D) 15 feet
Answer: B) 6 feet
Rationale: According to the NEC, flexible metal conduit (FMC) must be supported at
intervals not exceeding 6 feet to prevent sagging and physical damage.
Question 13:
What type of wiring method is typically used in residential construction for branch
circuits?
A) Conduit wiring
B) Cable assemblies
C) Busway systems
D) Open wiring
Answer: B) Cable assemblies
Rationale: Non-metallic sheathed cable (e.g., Romex) is commonly used in residential
branch circuits due to its flexibility and ease of installation.
