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12
3.2 Electrical Design
3.2.1 Upstream Wiring
Charging stations are considered continuous load devices (EVs draw maximum load for long
durations); therefore, electrical branch circuits must be sized at 125% of the load for North
American installations, in accordance with National Electric Code (NEC) requirements. (For
other regions, refer to local code.) This means that for a maximum 50 A load at 208/240 V
output to an electric vehicle, 65 or 70 A breakers are required.
Wiring must be sized in accordance with NEC code for continuous load devices. Typically, 16
mm
2
or 10 mm
2
(6 AWG or 8 AWG) insulated electrical wire is used, depending upon the
rating of the circuit and the distance between the electrical panel and the charging station.
The terminal block accepts a maximum of 16 mm
2
(6 AWG).
3.2.2 Upstream Wiring
240 VAC Panel
1. Main Breaker
2. PE Bus
3. L1
4. L2
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