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7
3
Installation
3.1 Electrical Design
3.1.1 Upstream Wiring
Chargers 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 40 A load at 208/240 V output to an electric vehicle, 50 A breaker is 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 charger. The terminal block accepts a maximum of 16 mm
2
(6 AWG).
240 VAC Panel
1. Main Breaker
2. PE Bus
3. L1
4. L2
5. Local Service or Sub Panel
6. L1
7. L2
8. PE
9. Input Terminal Block
10. Output Terminal Block
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