NYC MASTER ELECTRICIAN
COMPREHENSIVE EXAM QUESTIONS
AND VERIFIED ANSWERS
1. Per the NYC Electrical Code, what is the maximum number of service disconnects permitted
for a single service, except for fire pumps?
A. 2
B. 6
C. 4
D. 1
Answer: B
Conceptual Explanation: NEC 230.71(A) and NYC amendments generally permit up to six
disconnects to be grouped in any one location for a single service.
2. When calculating conductor ampacity for a circuit with 8 current-carrying conductors in a
single raceway, what is the required adjustment factor?
A. 70%
B. 80%
C. 50%
D. 40%
,Answer: A
Conceptual Explanation: Table 310.15(C)(1) specifies an adjustment factor of 70% for 7
to 9 current-carrying conductors.
3. What is the minimum size copper grounding electrode conductor for a service with 1000
kcmil copper service-entrance conductors?
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 250 kcmil
Answer: C
Conceptual Explanation: Table 250.66 requires a 3/0 copper grounding electrode
conductor for service conductors over 600 kcmil through 1100 kcmil.
4. In NYC, which wiring method is generally prohibited for use in a building’s permanent
wiring for commercial occupancies?
A. Rigid Metal Conduit (RMC)
B. Intermediate Metal Conduit (IMC)
C. Mineral Insulated Cable (Type MI)
D. Nonmetallic-Sheathed Cable (Type NM)
Answer: D
, Conceptual Explanation: NYC amendments to the NEC strictly limit the use of Type NM
(Romex) to certain residential structures, prohibiting it in most commercial applications.
5. What is the required clear working space depth for electrical equipment operating at 480V
to ground with exposed live parts on one side and grounded parts on the other (Condition 2)?
A. 3 feet
B. 3.5 feet
C. 4 feet
D. 5 feet
Answer: B
Conceptual Explanation: Table 110.26(A)(1) requires 3.5 feet for Condition 2 at voltages
between 151 and 600 volts to ground.
6. A 50HP, 460V, 3-phase NEMA Design B motor has a full-load current of 65A. What is the
maximum size for an inverse time circuit breaker for branch-circuit short-circuit and ground-
fault protection?
A. 175A
B. 150A
C. 100A
D. 200A
Answer: A
COMPREHENSIVE EXAM QUESTIONS
AND VERIFIED ANSWERS
1. Per the NYC Electrical Code, what is the maximum number of service disconnects permitted
for a single service, except for fire pumps?
A. 2
B. 6
C. 4
D. 1
Answer: B
Conceptual Explanation: NEC 230.71(A) and NYC amendments generally permit up to six
disconnects to be grouped in any one location for a single service.
2. When calculating conductor ampacity for a circuit with 8 current-carrying conductors in a
single raceway, what is the required adjustment factor?
A. 70%
B. 80%
C. 50%
D. 40%
,Answer: A
Conceptual Explanation: Table 310.15(C)(1) specifies an adjustment factor of 70% for 7
to 9 current-carrying conductors.
3. What is the minimum size copper grounding electrode conductor for a service with 1000
kcmil copper service-entrance conductors?
A. 1/0 AWG
B. 2/0 AWG
C. 3/0 AWG
D. 250 kcmil
Answer: C
Conceptual Explanation: Table 250.66 requires a 3/0 copper grounding electrode
conductor for service conductors over 600 kcmil through 1100 kcmil.
4. In NYC, which wiring method is generally prohibited for use in a building’s permanent
wiring for commercial occupancies?
A. Rigid Metal Conduit (RMC)
B. Intermediate Metal Conduit (IMC)
C. Mineral Insulated Cable (Type MI)
D. Nonmetallic-Sheathed Cable (Type NM)
Answer: D
, Conceptual Explanation: NYC amendments to the NEC strictly limit the use of Type NM
(Romex) to certain residential structures, prohibiting it in most commercial applications.
5. What is the required clear working space depth for electrical equipment operating at 480V
to ground with exposed live parts on one side and grounded parts on the other (Condition 2)?
A. 3 feet
B. 3.5 feet
C. 4 feet
D. 5 feet
Answer: B
Conceptual Explanation: Table 110.26(A)(1) requires 3.5 feet for Condition 2 at voltages
between 151 and 600 volts to ground.
6. A 50HP, 460V, 3-phase NEMA Design B motor has a full-load current of 65A. What is the
maximum size for an inverse time circuit breaker for branch-circuit short-circuit and ground-
fault protection?
A. 175A
B. 150A
C. 100A
D. 200A
Answer: A
