Per the National Electrical Code (NEC), electrical equipment must be rated for voltage and ampacity, and it is required to carry normal current and the amount of available fault current during ground-fault or short-circuit conditions. Warnings also must be on equipment that is likely to need examination, adjustment, servicing or maintenance while energized.
Created by: Michael Johnston
1. Service equipment rated at 1,000 volts or less shall be ______.
A. Listed
B. Identified as suitable for use as service equipment
C. Rated for the voltage and ampacity of service
D. All of the above
2. Arc-flash hazard warnings are required on electrical equipment to warn ______ of potential hazards.
A. Building owners
B. Property managers
C. Qualified people
D. Unqualified people
3. For service equipment rated at 1,600 amperes (A) in other than industrial installations, what information is required to be included on an arc-flash hazard warning label to ensure qualified people service this installation and existing arc-flash warning labels meeting NFPA 70E are applied?
A. Nominal system voltage and available fault current
B. Service overcurrent device clearing time
C. Date the warning label was applied
4. If the maximum amount of fault current served by the utility company is 90,500A, ______ service equipment short-circuit current ratings (SCCR) are not in compliance with the NEC.
A. 65,000
B. 100,000
C. 150,000
D. 200,000
5. Section 110.24 is required to be applied when determining the amount of available fault current on an arc-flash hazard warning label that is required to be applied to service equipment.
A. True
B. False
6. The ______ of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices to work without extensive damage to the circuit’s electrical equipment.
A. Overcurrent protective devices
B. Total impedance
C. Equipment short-circuit current ratings and other characteristics
7. Which is not required to have an arc-flash hazard warning?
A. Dwelling unit service equipment
B. A service for an office building
C. A motor control center that is also the service for a pumping station
D. An industrial control panel installed in a restaurant for a sump pump
8. The documented maximum available fault current (calculation or published value) required by 110.24(A) shall be available to all but which of the following?
A. Those authorized to inspect the system
B. Those authorized to manage the property
C. Those authorized to design and install the system
D. Those authorized to maintain and operate the system
9. If modifications to the electrical installation occur that affect the maximum available fault current at the service, the maximum available fault current shall be ______ as necessary to ensure the service equipment ratings are sufficient.
A. Increased
B. Verified or recalculated
C. Decreased to within 10 percent of the maximum service equipment rating
D. Permitted in existing equipment
10. If a panelboard is listed and required to have a SCCR of 22,000A, and the equipment is not installed as a listed series-rated system, the installed breakers must have a minimum SCCR of ______ kAIC.
A. 10
B. 14
C. 22
D. 42
