NYC ELECTRICIAN (NYC HEALTH +
HOSPITALS - H+H) PROFESSIONAL
EXAM PREP QUESTIONS AND
VERIFIED ANSWERS
1. According to NEC Article 517 (Health Care Facilities), what is the maximum allowable
potential difference between any two exposed conductive surfaces in the patient care vicinity
of a Category 1 space?
A. 10 mV
B. 100 mV
C. 20 mV
D. 500 mV
Answer: C
Conceptual Explanation: NEC 517.14 and related standards for Critical Care (Category 1)
spaces specify that the potential difference between two conductive surfaces in the patient
care vicinity shall not exceed 20 mV under normal conditions to prevent micro-shock
hazards.
,2. In NYC Health + Hospitals facilities, which branch of the Essential Electrical System (EES) is
strictly reserved for functions like exit signs, fire alarm systems, and emergency
communication?
A. Critical Branch
B. Life Safety Branch
C. Equipment Branch
D. Normal Power Branch
Answer: B
Conceptual Explanation: The Life Safety Branch (NEC 517.32) is limited to systems
necessary for the safety of life and evacuation, such as egress lighting and fire alarms.
3. What is the minimum number of branch circuits required for each patient bed location in a
Category 1 (Critical Care) space?
A. One circuit
B. Two circuits (one from the normal system and one from the EES)
C. Six circuits
D. Eight circuits
Answer: B
Conceptual Explanation: NEC 517.18(B) and 517.19 require that each patient bed
location be supplied by at least two branch circuits, one of which must be from the
, emergency system and one from the normal system (or both from the emergency system if
fed from separate transfer switches).
4. Isolated Power Systems (IPS) are primarily installed in anesthetizing locations and
operating rooms to:
A. Provide higher voltage for surgical lasers
B. Ensure the circuit breaker trips instantly on a first ground fault
C. Maintain continuity of power even if a single ground fault occurs
D. Reduce the load on the hospital’s main transformer
Answer: C
Conceptual Explanation: An IPS uses an isolation transformer to prevent a single line-to-
ground fault from tripping the breaker, ensuring life-support equipment continues to
function while alerting staff via a Line Isolation Monitor.
5. A Line Isolation Monitor (LIM) must be designed to trigger an alarm when the total hazard
current (leakage) from the isolated system reaches:
A. 5 mA
B. 2 mA
C. 10 mA
D. 20 mA
Answer: A
HOSPITALS - H+H) PROFESSIONAL
EXAM PREP QUESTIONS AND
VERIFIED ANSWERS
1. According to NEC Article 517 (Health Care Facilities), what is the maximum allowable
potential difference between any two exposed conductive surfaces in the patient care vicinity
of a Category 1 space?
A. 10 mV
B. 100 mV
C. 20 mV
D. 500 mV
Answer: C
Conceptual Explanation: NEC 517.14 and related standards for Critical Care (Category 1)
spaces specify that the potential difference between two conductive surfaces in the patient
care vicinity shall not exceed 20 mV under normal conditions to prevent micro-shock
hazards.
,2. In NYC Health + Hospitals facilities, which branch of the Essential Electrical System (EES) is
strictly reserved for functions like exit signs, fire alarm systems, and emergency
communication?
A. Critical Branch
B. Life Safety Branch
C. Equipment Branch
D. Normal Power Branch
Answer: B
Conceptual Explanation: The Life Safety Branch (NEC 517.32) is limited to systems
necessary for the safety of life and evacuation, such as egress lighting and fire alarms.
3. What is the minimum number of branch circuits required for each patient bed location in a
Category 1 (Critical Care) space?
A. One circuit
B. Two circuits (one from the normal system and one from the EES)
C. Six circuits
D. Eight circuits
Answer: B
Conceptual Explanation: NEC 517.18(B) and 517.19 require that each patient bed
location be supplied by at least two branch circuits, one of which must be from the
, emergency system and one from the normal system (or both from the emergency system if
fed from separate transfer switches).
4. Isolated Power Systems (IPS) are primarily installed in anesthetizing locations and
operating rooms to:
A. Provide higher voltage for surgical lasers
B. Ensure the circuit breaker trips instantly on a first ground fault
C. Maintain continuity of power even if a single ground fault occurs
D. Reduce the load on the hospital’s main transformer
Answer: C
Conceptual Explanation: An IPS uses an isolation transformer to prevent a single line-to-
ground fault from tripping the breaker, ensuring life-support equipment continues to
function while alerting staff via a Line Isolation Monitor.
5. A Line Isolation Monitor (LIM) must be designed to trigger an alarm when the total hazard
current (leakage) from the isolated system reaches:
A. 5 mA
B. 2 mA
C. 10 mA
D. 20 mA
Answer: A
