NYC Electrician (NYC Health + Hospitals) EXAM with
Questions and Answers/Plus a Rationale Updated 2026
A+/Instant Download PDF
Table of Contents
1. National Electrical Code (NEC) Compliance
2. Electrical Theory and Circuit Analysis
3. Healthcare Facility Wiring (NFPA 99)
4. Motor Controls and Troubleshooting
5. Grounding and Bonding Systems
6. Safety Procedures (OSHA/PPE)
1. A hospital's emergency power system is experiencing intermittent voltage sags during the
transfer from utility to generator. Upon inspection of the Automatic Transfer Switch (ATS), you
notice the transition delay is set to 2 seconds. Which action should be taken to ensure compliance
with NFPA 99 and maintain equipment integrity?
A. Increase the neutral-to-ground bond resistance to dissipate transient energy.
B. Adjust the time delay settings on the ATS to ensure proper motor deceleration before
reconnection.
C. Replace the ATS contactors with solid-state switches to eliminate physical switching delays.
D. Install a secondary grounding electrode system specifically for the emergency power branch.
Answer: B
, Rationale: Adjusting the time delay allows motors connected to the load to cease rotation,
preventing high current inrush or out-of-phase re-energization that causes voltage sags. A is
incorrect as increasing resistance is dangerous and prohibited. C is not the standard procedure
for fixing voltage sags in ATS units. D is unnecessary and does not address the switching
mechanism's timing issue.
CORRECT ANSWER : B
2. During an installation in a surgical suite, you are routing branch circuits. According to the NEC
and NFPA 99, what is the mandatory requirement for the grounding of all metallic raceways and
equipment within the patient care vicinity?
A. Use only rigid metal conduit (RMC) with threaded couplings for all runs.
B. Install an insulated copper equipment grounding conductor in addition to the raceway
grounding.
C. Bond all metallic surfaces to the nearest building structural steel component.
D. Ensure the raceway system provides a continuous low-impedance path to the service entrance
only.
Answer: B
Rationale: In patient care vicinities, NFPA 99 and the NEC require redundant grounding paths
to ensure protection against electrical shock. A is too restrictive as EMT is often used. C is not
sufficient as a standalone grounding method. D fails to account for the specific redundant
copper path requirement mandated for healthcare environments.
CORRECT ANSWER : B
3. A 480V 3-phase motor in the hospital HVAC system trips the circuit breaker upon start-up, even
though the insulation resistance test (megger) showed acceptable levels. What is the most likely
cause?
A. A mechanical binding or seizure within the motor load.
B. Excessive moisture accumulation in the motor windings.
C. A phase imbalance between the line-to-line voltages.
D. The motor is operating at 110% of its rated nameplate current.
Answer: A
, Rationale: If insulation resistance is acceptable, the trip is likely due to excessive current draw
caused by mechanical resistance rather than a winding fault. B and C would likely show up on
electrical testing or cause operation issues prior to start-up. D is unlikely to trip a properly sized
breaker instantly unless it is a severe short circuit.
CORRECT ANSWER : A
4. You are verifying the continuity of a branch circuit in a critical care unit. Which testing device
provides the most accurate assessment of circuit impedance under actual load conditions?
A. Digital Multimeter (DMM) set to ohms mode.
B. Non-contact voltage tester.
C. Loop impedance tester.
D. Clamp-on ammeter.
Answer: C
Rationale: Loop impedance testers measure the total resistance of the path, including the source
transformer, which is critical for verifying fault current levels. A is only accurate for de-
energized circuits. B is for presence of voltage only. D measures current draw but does not test
the integrity of the ground fault path.
CORRECT ANSWER : C
5. When working on a Class I, Division 2 hazardous location in a hospital laboratory, which wiring
method is permissible under the NEC?
A. Type NM cable (Romex).
B. Electrical Metallic Tubing (EMT) with listed fittings.
C. Flexible metal conduit without a bonding jumper.
D. Open wiring on insulators.
Answer: B
Rationale: EMT is a standard, approved wiring method for Class I, Div 2 locations when
installed with appropriate fittings to maintain the required integrity. A and D are prohibited in
hazardous locations due to the risk of sparking. C is incorrect because a bonding jumper is
explicitly required for flexible conduit in hazardous areas.
CORRECT ANSWER : B
, 6. The primary purpose of a "Separately Derived System" in a facility's electrical distribution is:
A. To increase the total voltage available for heavy equipment.
B. To isolate the load side from the source side via an isolation transformer or generator.
C. To bypass the utility metering for emergency energy usage.
D. To eliminate the need for overcurrent protection on the load side.
Answer: B
Rationale: A separately derived system has no direct electrical connection to the supply
conductors; it is isolated, providing a new reference point. A is incorrect as transformers change
voltage, not capacity. C is incorrect as metering is still required. D is false; overcurrent
protection is strictly required for both sides.
CORRECT ANSWER : B
7. You are inspecting a 120/208V panelboard. You observe that the neutral conductor is bonded to
the equipment ground at a downstream sub-panel. What is the immediate safety consequence?
A. The circuit breaker will not trip on overload.
B. The metallic equipment chassis may become energized during a neutral fault.
C. The voltage between line and neutral will drop to zero.
D. The circuit will fail to deliver the rated power to the load.
Answer: B
Rationale: Bonding the neutral to ground at a sub-panel creates a parallel path for return
current, which can energize metal parts and cause the ground-fault protection to be bypassed. A
is incorrect as the breaker responds to overcurrent. C and D describe different electrical failures
not inherent to improper bonding.
CORRECT ANSWER : B
8. When calculating the load for a hospital lighting circuit, what factor must be applied for
"continuous duty" loads as per the NEC?
A. 100% of the calculated load.
B. 125% of the calculated load.
Questions and Answers/Plus a Rationale Updated 2026
A+/Instant Download PDF
Table of Contents
1. National Electrical Code (NEC) Compliance
2. Electrical Theory and Circuit Analysis
3. Healthcare Facility Wiring (NFPA 99)
4. Motor Controls and Troubleshooting
5. Grounding and Bonding Systems
6. Safety Procedures (OSHA/PPE)
1. A hospital's emergency power system is experiencing intermittent voltage sags during the
transfer from utility to generator. Upon inspection of the Automatic Transfer Switch (ATS), you
notice the transition delay is set to 2 seconds. Which action should be taken to ensure compliance
with NFPA 99 and maintain equipment integrity?
A. Increase the neutral-to-ground bond resistance to dissipate transient energy.
B. Adjust the time delay settings on the ATS to ensure proper motor deceleration before
reconnection.
C. Replace the ATS contactors with solid-state switches to eliminate physical switching delays.
D. Install a secondary grounding electrode system specifically for the emergency power branch.
Answer: B
, Rationale: Adjusting the time delay allows motors connected to the load to cease rotation,
preventing high current inrush or out-of-phase re-energization that causes voltage sags. A is
incorrect as increasing resistance is dangerous and prohibited. C is not the standard procedure
for fixing voltage sags in ATS units. D is unnecessary and does not address the switching
mechanism's timing issue.
CORRECT ANSWER : B
2. During an installation in a surgical suite, you are routing branch circuits. According to the NEC
and NFPA 99, what is the mandatory requirement for the grounding of all metallic raceways and
equipment within the patient care vicinity?
A. Use only rigid metal conduit (RMC) with threaded couplings for all runs.
B. Install an insulated copper equipment grounding conductor in addition to the raceway
grounding.
C. Bond all metallic surfaces to the nearest building structural steel component.
D. Ensure the raceway system provides a continuous low-impedance path to the service entrance
only.
Answer: B
Rationale: In patient care vicinities, NFPA 99 and the NEC require redundant grounding paths
to ensure protection against electrical shock. A is too restrictive as EMT is often used. C is not
sufficient as a standalone grounding method. D fails to account for the specific redundant
copper path requirement mandated for healthcare environments.
CORRECT ANSWER : B
3. A 480V 3-phase motor in the hospital HVAC system trips the circuit breaker upon start-up, even
though the insulation resistance test (megger) showed acceptable levels. What is the most likely
cause?
A. A mechanical binding or seizure within the motor load.
B. Excessive moisture accumulation in the motor windings.
C. A phase imbalance between the line-to-line voltages.
D. The motor is operating at 110% of its rated nameplate current.
Answer: A
, Rationale: If insulation resistance is acceptable, the trip is likely due to excessive current draw
caused by mechanical resistance rather than a winding fault. B and C would likely show up on
electrical testing or cause operation issues prior to start-up. D is unlikely to trip a properly sized
breaker instantly unless it is a severe short circuit.
CORRECT ANSWER : A
4. You are verifying the continuity of a branch circuit in a critical care unit. Which testing device
provides the most accurate assessment of circuit impedance under actual load conditions?
A. Digital Multimeter (DMM) set to ohms mode.
B. Non-contact voltage tester.
C. Loop impedance tester.
D. Clamp-on ammeter.
Answer: C
Rationale: Loop impedance testers measure the total resistance of the path, including the source
transformer, which is critical for verifying fault current levels. A is only accurate for de-
energized circuits. B is for presence of voltage only. D measures current draw but does not test
the integrity of the ground fault path.
CORRECT ANSWER : C
5. When working on a Class I, Division 2 hazardous location in a hospital laboratory, which wiring
method is permissible under the NEC?
A. Type NM cable (Romex).
B. Electrical Metallic Tubing (EMT) with listed fittings.
C. Flexible metal conduit without a bonding jumper.
D. Open wiring on insulators.
Answer: B
Rationale: EMT is a standard, approved wiring method for Class I, Div 2 locations when
installed with appropriate fittings to maintain the required integrity. A and D are prohibited in
hazardous locations due to the risk of sparking. C is incorrect because a bonding jumper is
explicitly required for flexible conduit in hazardous areas.
CORRECT ANSWER : B
, 6. The primary purpose of a "Separately Derived System" in a facility's electrical distribution is:
A. To increase the total voltage available for heavy equipment.
B. To isolate the load side from the source side via an isolation transformer or generator.
C. To bypass the utility metering for emergency energy usage.
D. To eliminate the need for overcurrent protection on the load side.
Answer: B
Rationale: A separately derived system has no direct electrical connection to the supply
conductors; it is isolated, providing a new reference point. A is incorrect as transformers change
voltage, not capacity. C is incorrect as metering is still required. D is false; overcurrent
protection is strictly required for both sides.
CORRECT ANSWER : B
7. You are inspecting a 120/208V panelboard. You observe that the neutral conductor is bonded to
the equipment ground at a downstream sub-panel. What is the immediate safety consequence?
A. The circuit breaker will not trip on overload.
B. The metallic equipment chassis may become energized during a neutral fault.
C. The voltage between line and neutral will drop to zero.
D. The circuit will fail to deliver the rated power to the load.
Answer: B
Rationale: Bonding the neutral to ground at a sub-panel creates a parallel path for return
current, which can energize metal parts and cause the ground-fault protection to be bypassed. A
is incorrect as the breaker responds to overcurrent. C and D describe different electrical failures
not inherent to improper bonding.
CORRECT ANSWER : B
8. When calculating the load for a hospital lighting circuit, what factor must be applied for
"continuous duty" loads as per the NEC?
A. 100% of the calculated load.
B. 125% of the calculated load.
