EVITP: Load calculation
Feeders and services
Level 4 Module 1
1. What is the first step when performing a feeder or service load calculation for an
EVSE installation?
A. Determine feeder conductor size
B. Identify branch circuit protection
C. Determine the total connected load
D. Choose grounding method
✅ Answer: C. Determine the total connected load
Explanation: The total connected load, including all continuous and noncontinuous
loads, is the foundation for calculating feeders and services.
2. According to NEC 220.87, demand factors can be applied to which type of loads?
A. Noncontinuous only
B. Continuous only
C. Both continuous and noncontinuous
D. None of the above
✅ Answer: C. Both continuous and noncontinuous
Explanation: Demand factors reduce the calculated load by recognizing that not all
loads operate simultaneously.
,3. When calculating feeder or service loads, continuous loads are multiplied by what
factor?
A. 100%
B. 125%
C. 80%
D. 115%
✅ Answer: B. 125%
Explanation: NEC Article 215 and Article 230 require continuous loads to be
calculated at 125% for feeder and service sizing.
4. A 240 V Level 2 EVSE draws 32 A continuously. What is the minimum ampacity of
the branch circuit conductor?
A. 32 A
B. 35 A
C. 40 A
D. 50 A
✅ Answer: C. 40 A
Explanation: 32 A × 125% = 40 A minimum circuit rating per NEC 625.42.
5. Which NEC article governs Electric Vehicle Power Transfer Systems?
A. Article 220
B. Article 430
C. Article 625
D. Article 310
✅ Answer: C. Article 625
Explanation: NEC Article 625 covers installation requirements for EVSE including
wiring methods and load calculations.
, 6. What demand factor applies when calculating a dwelling unit feeder load per NEC
Table 220.42?
A. 100% of all loads
B. 100% for first 3000 VA and 35% thereafter
C. 125% of continuous loads
D. 80% for all receptacles
✅ Answer: B. 100% for first 3000 VA and 35% thereafter
Explanation: This table provides general lighting demand factors for dwellings.
7. An EVSE rated at 7.2 kW is to be connected to a 240 V single-phase feeder. What is
the current draw?
A. 15 A
B. 20 A
C. 30 A
D. 40 A
✅ Answer: C. 30 A
Explanation:
𝐼
=
𝑃
/
𝑉
=
7200
𝑊
/
240
𝑉
=
30
Feeders and services
Level 4 Module 1
1. What is the first step when performing a feeder or service load calculation for an
EVSE installation?
A. Determine feeder conductor size
B. Identify branch circuit protection
C. Determine the total connected load
D. Choose grounding method
✅ Answer: C. Determine the total connected load
Explanation: The total connected load, including all continuous and noncontinuous
loads, is the foundation for calculating feeders and services.
2. According to NEC 220.87, demand factors can be applied to which type of loads?
A. Noncontinuous only
B. Continuous only
C. Both continuous and noncontinuous
D. None of the above
✅ Answer: C. Both continuous and noncontinuous
Explanation: Demand factors reduce the calculated load by recognizing that not all
loads operate simultaneously.
,3. When calculating feeder or service loads, continuous loads are multiplied by what
factor?
A. 100%
B. 125%
C. 80%
D. 115%
✅ Answer: B. 125%
Explanation: NEC Article 215 and Article 230 require continuous loads to be
calculated at 125% for feeder and service sizing.
4. A 240 V Level 2 EVSE draws 32 A continuously. What is the minimum ampacity of
the branch circuit conductor?
A. 32 A
B. 35 A
C. 40 A
D. 50 A
✅ Answer: C. 40 A
Explanation: 32 A × 125% = 40 A minimum circuit rating per NEC 625.42.
5. Which NEC article governs Electric Vehicle Power Transfer Systems?
A. Article 220
B. Article 430
C. Article 625
D. Article 310
✅ Answer: C. Article 625
Explanation: NEC Article 625 covers installation requirements for EVSE including
wiring methods and load calculations.
, 6. What demand factor applies when calculating a dwelling unit feeder load per NEC
Table 220.42?
A. 100% of all loads
B. 100% for first 3000 VA and 35% thereafter
C. 125% of continuous loads
D. 80% for all receptacles
✅ Answer: B. 100% for first 3000 VA and 35% thereafter
Explanation: This table provides general lighting demand factors for dwellings.
7. An EVSE rated at 7.2 kW is to be connected to a 240 V single-phase feeder. What is
the current draw?
A. 15 A
B. 20 A
C. 30 A
D. 40 A
✅ Answer: C. 30 A
Explanation:
𝐼
=
𝑃
/
𝑉
=
7200
𝑊
/
240
𝑉
=
30
