NYC HEALTH + HOSPITALS
ELECTRICIAN EXAM PREP QUESTIONS
AND VERIFIED ANSWERS
1. According to NYC Electrical Code and NEC Article 517, which branch of the Essential
Electrical System (EES) is NOT permitted to have an automatic delayed connection to the
alternate power source?
A. Life Safety Branch
B. Critical Branch
C. Equipment Branch
D. Non-essential Branch
Answer: A
Conceptual Explanation: The Life Safety Branch and Critical Branch must be restored
within 10 seconds. However, the Life Safety Branch is prioritized for immediate automatic
restoration to ensure egress lighting and alarm systems operate instantly.
2. In a patient care space, what is the maximum permitted impedance for the equipment
grounding conductor from a receptacle to the reference grounding point?
A. 0.5 ohms
B. 0.1 ohms
,C. 1.0 ohms
D. 0.2 ohms
Answer: D
Conceptual Explanation: NFPA 99 and NEC 517 stipulate that the potential difference and
impedance must be kept very low to prevent microshock hazards; 0.2 ohms is the standard
maximum impedance for grounding in these sensitive areas.
3. What is the minimum size copper equipment grounding conductor for a 400-ampere
feeder, based on NEC Table 250.122?
A. 4 AWG
B. 1 AWG
C. 2 AWG
D. 3 AWG
Answer: D
Conceptual Explanation: According to Table 250.122, for a 400-ampere overcurrent
protective device, a 3 AWG copper conductor is the minimum requirement for grounding.
4. In NYC hospitals, which wiring method is generally prohibited for use in ‘Patient Care
Victinity’ areas?
A. Type NM Cable (Romex)
B. Electrical Metallic Tubing (EMT)
, C. Rigid Metal Conduit (RMC)
D. AC Cable (HCF type)
Answer: A
Conceptual Explanation: NYC Electrical Code strictly prohibits non-metallic sheathed
cables (Type NM) in healthcare facilities and most commercial structures. Only metallic
raceways or specifically listed HCF cables are allowed.
5. Calculate the full-load current for a 50 HP, 460V, 3-phase induction motor using NEC Table
430.250.
A. 52 Amps
B. 65 Amps
C. 75 Amps
D. 96 Amps
Answer: B
Conceptual Explanation: Per NEC Table 430.250, a 50 HP 3-phase motor at 460V has a
rated full-load current of 65 Amps.
6. A 208V, 3-phase heater has a power rating of 15 kW. What is the approximate line current?
A. 41.6 Amps
B. 72.1 Amps
C. 24.0 Amps
ELECTRICIAN EXAM PREP QUESTIONS
AND VERIFIED ANSWERS
1. According to NYC Electrical Code and NEC Article 517, which branch of the Essential
Electrical System (EES) is NOT permitted to have an automatic delayed connection to the
alternate power source?
A. Life Safety Branch
B. Critical Branch
C. Equipment Branch
D. Non-essential Branch
Answer: A
Conceptual Explanation: The Life Safety Branch and Critical Branch must be restored
within 10 seconds. However, the Life Safety Branch is prioritized for immediate automatic
restoration to ensure egress lighting and alarm systems operate instantly.
2. In a patient care space, what is the maximum permitted impedance for the equipment
grounding conductor from a receptacle to the reference grounding point?
A. 0.5 ohms
B. 0.1 ohms
,C. 1.0 ohms
D. 0.2 ohms
Answer: D
Conceptual Explanation: NFPA 99 and NEC 517 stipulate that the potential difference and
impedance must be kept very low to prevent microshock hazards; 0.2 ohms is the standard
maximum impedance for grounding in these sensitive areas.
3. What is the minimum size copper equipment grounding conductor for a 400-ampere
feeder, based on NEC Table 250.122?
A. 4 AWG
B. 1 AWG
C. 2 AWG
D. 3 AWG
Answer: D
Conceptual Explanation: According to Table 250.122, for a 400-ampere overcurrent
protective device, a 3 AWG copper conductor is the minimum requirement for grounding.
4. In NYC hospitals, which wiring method is generally prohibited for use in ‘Patient Care
Victinity’ areas?
A. Type NM Cable (Romex)
B. Electrical Metallic Tubing (EMT)
, C. Rigid Metal Conduit (RMC)
D. AC Cable (HCF type)
Answer: A
Conceptual Explanation: NYC Electrical Code strictly prohibits non-metallic sheathed
cables (Type NM) in healthcare facilities and most commercial structures. Only metallic
raceways or specifically listed HCF cables are allowed.
5. Calculate the full-load current for a 50 HP, 460V, 3-phase induction motor using NEC Table
430.250.
A. 52 Amps
B. 65 Amps
C. 75 Amps
D. 96 Amps
Answer: B
Conceptual Explanation: Per NEC Table 430.250, a 50 HP 3-phase motor at 460V has a
rated full-load current of 65 Amps.
6. A 208V, 3-phase heater has a power rating of 15 kW. What is the approximate line current?
A. 41.6 Amps
B. 72.1 Amps
C. 24.0 Amps
