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Interrupt) is related to the station’s upstream breaker.
Transformer Configuration
Refer to the following tables to configure electrical service.
*Delta (floating or grounded) is not supported
AC Disconnect Switch
A local AC disconnect switch, separate from the shunt trip wiring, is recommended to be installed
between each charging station and the electrical panel. This is especially important if the main
electrical panel or utility room is distant, out of line of sight, or has restricted access. For North
America installations, refer to disconnect switch requirements per NEC Article 625, “Electric Vehicle
Charging and Supply Equipment Systems”.
Do not install a DC disconnect between Paired charging stations.
RCD Use
The use of an RCD is not recommended. RCD use can create nuisance tripping, especially during
transient conditions such as power restoration, line surge, line dips, or phase loss.
To reduce the risk of shock, the Express 250 provides:
• Galvanic (reinforced) isolation between the AC input and DC output. Current does not flow to
earth ground, even in cases such as charge cable damage.
• An output isolation monitor interrupter (IMI).
If the isolation level is compromised, charging is halted or prevented from starting, and the output
CAUTION: The Express 250 charging station is tested to IEC 61000-4-5, Level 5
(6 kV @ 3000 A) standards. In geographic areas that experience frequent thunderstorms,
supplemental surge protection must be installed at the service panel to guard against
product damage.
North America Europe
Input Rating 480 VAC, 3-phase, 80 A, 60 Hz 400 VAC, 3-phase, 96 A, 50 Hz
Electrical Service
Configuration
277/480 4 wire WYE* 230/400 Y, L1, L2, L3, N, Ground
Product Connection 3-phase 480 plus ground
(neutral not required)
3-phase 400 plus protective earth
(neutral not required)
WARNING: If service is performed on either Paired charging station, both stations must be
powered off at their AC disconnect switch(es) and locked out/tagged out for safety.
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