Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What is the primary voltage level for most Level 2 residential EV
charging stations?
a) 120V
b) 240V
c) 208V
d) 480V
Level 2 chargers typically use 240V to provide faster charging than
standard 120V outlets.
2. Which NEC article primarily governs the installation of EV charging
equipment?
a) Article 210
b) Article 625
c) Article 690
d) Article 250
Article 625 covers electric vehicle charging systems and their installation
requirements.
3. A commercial EV charging station requires a 60-amp circuit. What
is the minimum wire size for copper conductors?
a) 6 AWG
b) 8 AWG
, c) 4 AWG
d) 2 AWG
For a 60-amp circuit, NEC Table 310.16 specifies 4 AWG copper for 75°C
conductors.
4. What is the purpose of a GFCI in an EV charging station?
a) Overcurrent protection
b) Protection against ground faults
c) Surge protection
d) Voltage regulation
GFCI devices protect users from electrical shock due to ground faults.
5. Which type of charging station can deliver up to 350 kW for rapid
charging?
a) Level 1
b) Level 2
c) DC Fast Charging
d) Solar-powered charger
DC fast chargers can provide very high power for rapid EV charging.
6. What is the recommended minimum clearance around an EVSE
for ventilation and safety?
a) 12 inches
b) 18 inches
c) 24 inches
d) 36 inches
NEC and manufacturer guidelines often recommend at least 36 inches of
clearance around EVSE for safety and maintenance.
, 7. What does EVSE stand for?
a) Electric Vehicle Supply Equipment
b) Electric Voltage Safety Equipment
c) Electric Vehicle Supply Equipment
d) Electrical Vehicle Service Entity
EVSE refers to the equipment that delivers electric energy from the grid
to the EV.
8. What is the standard connector type for Level 2 EV charging in the
U.S.?
a) CHAdeMO
b) SAE J1772
c) CCS Type 2
d) Tesla Connector
SAE J1772 is the standard connector for Level 1 and Level 2 AC charging
in North America.
9. Which device is required to disconnect the EVSE from the supply
during maintenance?
a) Circuit breaker
b) Disconnect switch
c) GFCI
d) Transformer
A disconnect switch allows safe isolation of the EVSE from the electrical
supply for maintenance.
10. What is the typical efficiency of a Level 2 EVSE?
a) 70%
b) 80%