Latest EVITP Exam FINAL Prep – 150
Questions with Correct Detailed -Answer- s |
Electric Vehicle Installation Training Program
Certification
Which of the following accurately describes the primary function of
Electric Vehicle Supply Equipment (EVSE) according to the NEC?
A) To convert AC power to DC power for charging the vehicle battery
B) To provide a safe, controlled connection between the premises wiring
and the electric vehicle
C) To regulate the charging speed based on the vehicle's battery
management system
D) To monitor and report energy usage to the utility company
Answer & Reasoning:
• Correct Answer: B
• NEC Reference: Article 625.2
• Explanation: The EVSE is fundamentally a safety interlock
system. It communicates with the vehicle (via the control pilot) to
ensure proper connection before energizing, provides overcurrent
protection, and may include ground fault protection. The actual AC-to-
DC conversion happens in the onboard charger within the vehicle.
Understanding this distinction is critical for proper installation and
troubleshooting.
An EVSE has a nameplate rating of 9.6 kW at 208 volts, three-phase.
What is the minimum branch circuit ampacity required for this
installation?
A) 30A
B) 40A
C) 50A
D) 60A
,Answer & Reasoning:
• Correct Answer: C
• Calculation:
1. Power in watts: 9,600W
2. Three-phase formula: Amps = Watts / (Volts × √3)
= 9,600 / (208 × 1.732) = 9,.3 = 26.6A
3. Apply 125% for continuous load: 26.6A × 1.25 = 33.3A
4. Minimum branch circuit ampacity: 40A (next standard size up
from 33.3A)
• Key Point: You must know both single-phase and three-phase
calculations. The 125% multiplier for continuous loads is non-
negotiable.
F
or a Level 2 EVSE installed in a commercial parking garage, the
disconnecting means must be:
A) Located within 50 feet of the EVSE
B) Lockable and within sight of the EVSE
C) A circuit breaker in the main service panel only
D) Integrated into the EVSE unit itself
A
nswer & Reasoning:
• Correct Answer: B
• NEC Reference: 625.43
• Explanation: For non-dwelling installations, the disconnect must
be within sight and readily accessible. It must also be lockable in
the open position. This differs from dwelling unit rules where the
branch circuit breaker can serve as the disconnect if lockable. "Within
sight" means visible and not more than 50 feet away.
When installing an EVSE with a 25-foot charging cable in a
public parking space, the cable management system must be
designed to:
A) Retract the cable fully when not in use
B) Prevent physical damage to the cable and connector
C) Keep the cable at least 18 inches above the pavement
D) Provide strain relief rated for 100 lbs of pull force
, A
nswer & Reasoning:
• Correct Answer: B
• NEC Reference: 625.50
• Explanation: The code emphasizes protection from physical
damage as the primary concern. While strain relief and keeping
cables off the ground are good practices, the NEC specifically
requires protection from damage. Retraction systems are not required
but may be part of the manufacturer's design.
A 48-amp EVSE is being installed on a dedicated circuit. What is the
minimum rating for the overcurrent protective device?
A) 50A
B) 60A
C) 70A
D) 80A
Answer & Reasoning:
• Correct Answer: B
• Calculation:
1. Apply 125%: 48A × 1.25 = 60A
2. NEC 240.6(A) standard sizes: 60A is a standard size
• Common Mistake: Don't use the 48A directly. EV charging is a
continuous load (3+ hours), so the 125% rule applies to both
conductor sizing AND overcurrent protection.
Four EVSE units, each rated at 32A continuous, are to be installed in a
parking lot. Using the optional calculation method for multiple EVSE
loads, what would be the minimum calculated load for the feeder
serving all four units?
A) 80A
B) 96A
C) 128A
D) 160A
Answer & Reasoning:
, • Correct Answer: B
• NEC Reference: 625.42
• Calculation:
1. Total if all at 100%: 32A × 4 = 128A
2. Optional calculation (diversity): First 4 EVSE can be calculated
at 100% of largest plus 0% of the rest? Wait, let's check...
Actually, NEC 625.42 states for multiple EVSE, you can apply
demand factors. For 4 units, it's often calculated as: 100% of
largest (32A) plus demand factor for the rest (check local
codes/standards). But a common industry calculation for 4 is:
32A + (32A × 3 × 0.25) = 32A + 24A = 56A? Let me recalc
carefully...
• Correction: The actual NEC 220.57 demand factors for EVSE: First
4 at 100% each = 128A minimum. However, many AHJs allow
applying Table 220.42 demand factors. The key is knowing that 100%
is always safe. For exam purposes, they might expect 100% × 4 =
128A. But let's check the actual optional method...
Actually, let's simplify: The standard answer for exam purposes is
often: 4 × 32A = 128A, with no demand factor allowed for
commercial.
• Better Answer for Exam: C (128A) - The NEC doesn't provide
specific demand factors for commercial EVSE, so you typically
calculate at 100% unless the AHJ approves otherwise.
Which EVSE installations require ground-fault protection of
equipment (GFPE)?
A) All Level 2 EVSE installations
B) Only EVSE rated over 60A
C) EVSE supplied by single-phase, 120V circuits only
D) EVSE installed in dwelling units with garage locations
Answer & Reasoning:
• Correct Answer: A
• NEC Reference: 625.54
• Explanation: ALL EVSE must have ground-fault protection. This can
be provided by the EVSE itself or by the circuit protection. The level
Questions with Correct Detailed -Answer- s |
Electric Vehicle Installation Training Program
Certification
Which of the following accurately describes the primary function of
Electric Vehicle Supply Equipment (EVSE) according to the NEC?
A) To convert AC power to DC power for charging the vehicle battery
B) To provide a safe, controlled connection between the premises wiring
and the electric vehicle
C) To regulate the charging speed based on the vehicle's battery
management system
D) To monitor and report energy usage to the utility company
Answer & Reasoning:
• Correct Answer: B
• NEC Reference: Article 625.2
• Explanation: The EVSE is fundamentally a safety interlock
system. It communicates with the vehicle (via the control pilot) to
ensure proper connection before energizing, provides overcurrent
protection, and may include ground fault protection. The actual AC-to-
DC conversion happens in the onboard charger within the vehicle.
Understanding this distinction is critical for proper installation and
troubleshooting.
An EVSE has a nameplate rating of 9.6 kW at 208 volts, three-phase.
What is the minimum branch circuit ampacity required for this
installation?
A) 30A
B) 40A
C) 50A
D) 60A
,Answer & Reasoning:
• Correct Answer: C
• Calculation:
1. Power in watts: 9,600W
2. Three-phase formula: Amps = Watts / (Volts × √3)
= 9,600 / (208 × 1.732) = 9,.3 = 26.6A
3. Apply 125% for continuous load: 26.6A × 1.25 = 33.3A
4. Minimum branch circuit ampacity: 40A (next standard size up
from 33.3A)
• Key Point: You must know both single-phase and three-phase
calculations. The 125% multiplier for continuous loads is non-
negotiable.
F
or a Level 2 EVSE installed in a commercial parking garage, the
disconnecting means must be:
A) Located within 50 feet of the EVSE
B) Lockable and within sight of the EVSE
C) A circuit breaker in the main service panel only
D) Integrated into the EVSE unit itself
A
nswer & Reasoning:
• Correct Answer: B
• NEC Reference: 625.43
• Explanation: For non-dwelling installations, the disconnect must
be within sight and readily accessible. It must also be lockable in
the open position. This differs from dwelling unit rules where the
branch circuit breaker can serve as the disconnect if lockable. "Within
sight" means visible and not more than 50 feet away.
When installing an EVSE with a 25-foot charging cable in a
public parking space, the cable management system must be
designed to:
A) Retract the cable fully when not in use
B) Prevent physical damage to the cable and connector
C) Keep the cable at least 18 inches above the pavement
D) Provide strain relief rated for 100 lbs of pull force
, A
nswer & Reasoning:
• Correct Answer: B
• NEC Reference: 625.50
• Explanation: The code emphasizes protection from physical
damage as the primary concern. While strain relief and keeping
cables off the ground are good practices, the NEC specifically
requires protection from damage. Retraction systems are not required
but may be part of the manufacturer's design.
A 48-amp EVSE is being installed on a dedicated circuit. What is the
minimum rating for the overcurrent protective device?
A) 50A
B) 60A
C) 70A
D) 80A
Answer & Reasoning:
• Correct Answer: B
• Calculation:
1. Apply 125%: 48A × 1.25 = 60A
2. NEC 240.6(A) standard sizes: 60A is a standard size
• Common Mistake: Don't use the 48A directly. EV charging is a
continuous load (3+ hours), so the 125% rule applies to both
conductor sizing AND overcurrent protection.
Four EVSE units, each rated at 32A continuous, are to be installed in a
parking lot. Using the optional calculation method for multiple EVSE
loads, what would be the minimum calculated load for the feeder
serving all four units?
A) 80A
B) 96A
C) 128A
D) 160A
Answer & Reasoning:
, • Correct Answer: B
• NEC Reference: 625.42
• Calculation:
1. Total if all at 100%: 32A × 4 = 128A
2. Optional calculation (diversity): First 4 EVSE can be calculated
at 100% of largest plus 0% of the rest? Wait, let's check...
Actually, NEC 625.42 states for multiple EVSE, you can apply
demand factors. For 4 units, it's often calculated as: 100% of
largest (32A) plus demand factor for the rest (check local
codes/standards). But a common industry calculation for 4 is:
32A + (32A × 3 × 0.25) = 32A + 24A = 56A? Let me recalc
carefully...
• Correction: The actual NEC 220.57 demand factors for EVSE: First
4 at 100% each = 128A minimum. However, many AHJs allow
applying Table 220.42 demand factors. The key is knowing that 100%
is always safe. For exam purposes, they might expect 100% × 4 =
128A. But let's check the actual optional method...
Actually, let's simplify: The standard answer for exam purposes is
often: 4 × 32A = 128A, with no demand factor allowed for
commercial.
• Better Answer for Exam: C (128A) - The NEC doesn't provide
specific demand factors for commercial EVSE, so you typically
calculate at 100% unless the AHJ approves otherwise.
Which EVSE installations require ground-fault protection of
equipment (GFPE)?
A) All Level 2 EVSE installations
B) Only EVSE rated over 60A
C) EVSE supplied by single-phase, 120V circuits only
D) EVSE installed in dwelling units with garage locations
Answer & Reasoning:
• Correct Answer: A
• NEC Reference: 625.54
• Explanation: ALL EVSE must have ground-fault protection. This can
be provided by the EVSE itself or by the circuit protection. The level
