For a new California residence with electric vehicle supply equipment (EVSE) installation, what is the minimum branch circuit rating required for a Level 2 charging station under Title 24 Part 6?
Correct Answer
D) 40 amperes
California Title 24, Part 6, Section 110.12 mandates that electric vehicle charging circuits must be rated for at least 40 amperes to support Level 2 charging requirements. This ensures adequate charging capacity for electric vehicles as part of California's zero-emission vehicle goals and building electrification standards for reducing greenhouse gas emissions.
Why This Is the Correct Answer
California Title 24, Part 6, Section 110.12 mandates a minimum 40-ampere branch circuit for Level 2 EVSE installations. This rating supports the 240-volt, 7.2 kW charging capacity typical of Level 2 stations, aligning with California's zero-emission vehicle initiatives and building electrification standards.
Why the Other Options Are Wrong
Option A: 20 amperes
20 amperes is the standard rating for many household circuits and Level 1 EV charging (120V trickle charge), not Level 2. A 20A circuit cannot safely support the higher power demands of a Level 2 charger.
Option B: 50 amperes
50 amperes is above the minimum requirement. While a 50A circuit would work electrically, the code specifies a minimum of 40A — not 50A. Oversizing is permissible but 50A is not the minimum.
Option C: 30 amperes
30 amperes is insufficient for Level 2 charging per Title 24. This rating is associated with dryer circuits and some older EV charger configurations but does not meet California's current minimum for Level 2 EVSE.
Memory Technique
Level 2 = 240V = 40 amps minimum. Think of the number '2' in Level 2: 2 × 20 = 40. California's Title 24 requires 40A to future-proof homes for EV adoption.
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