If the EVSE nameplate rating is 6800 VA, which value is used for service/feeder calculations?

If the EVSE nameplate rating is 6800 VA, which value is used for service/feeder calculations?

• A. 6800 VA
• B. 7200 VA
• C. 3000 VA
• D. 1200 VA

Answer: (B)

For service and feeder sizing of EV charging equipment, you don’t use the raw nameplate VA directly. You convert the rating to a circuit current and then round up to the next standard circuit size used in protective devices. Here, 6800 VA at 240 V is about 28.3 A. The next standard circuit rating is 30 A, which yields 30 A × 240 V = 7200 VA. That rounded value — 7200 VA — is the value used for service/feeder calculations. Using 6800 VA would understate the required feeder sizing, while 3000 VA or 1200 VA are far below what the EVSE could draw and wouldn’t meet protection/ conductor sizing requirements.

For service and feeder sizing of EV charging equipment, you don’t use the raw nameplate VA directly. You convert the rating to a circuit current and then round up to the next standard circuit size used in protective devices.

Here, 6800 VA at 240 V is about 28.3 A. The next standard circuit rating is 30 A, which yields 30 A × 240 V = 7200 VA. That rounded value — 7200 VA — is the value used for service/feeder calculations.

Using 6800 VA would understate the required feeder sizing, while 3000 VA or 1200 VA are far below what the EVSE could draw and wouldn’t meet protection/ conductor sizing requirements.