3 Electrical Design
3
The default Express 280 installation requires service wiring to be installed underground. If a site requires
surface mounting, contact ChargePoint before beginning work, to obtain an approved surface installation
method. Conduit and wire size are determined based on the length of runs from the electrical panel to the
station location. Service wiring must be run through conduit or ducting to comply with local electrical
codes. Consult national and local codes or a project engineer to determine the grade, quality, and size of
the conduit or cable. The ChargePoint Concrete Mounting Template (CMT) accommodates service wiring
through the flare, conduit, or locally appropriate wiring method.
Note: All wiring and conduit is supplied by the contractor unless otherwise indicated.
Note: It is possible to pre-install Express 280 charging stations as standalone initially and pair them at a
later date, if desired. In this case, install the DC and Ethernet conduit and run a pull rope through the
conduit before landing the charging stations. Contact ChargePoint for instructions to pair two charging
stations when ready.
Upstream Components
Charging stations are considered continuous load devices (EVs draw maximum load for long durations).
Therefore, electrical branch circuits to EV chargers must be sized at 125% of the load on each leg of a 3-
phase panel for North America installations in accordance with National Electric Code requirements. For
other regions, refer to local code.
When planning multiple EV charging stations, it is best practice to segment non-continuous and
continuous loads, with all branch circuits for EV charging on a dedicated electrical panel assembly with
adequate circuit breakers. When sizing new electrical panels dedicated for EV charging, all branch circuits
must support continuous load.
Each Express 280 requires a service panel breaker as follows:
Nominal Voltage Max AC Current Circuit Breaker Size
480 VAC (NA) 100 A 125 A (125% continuous load required for North America)
The Express 280 does not contain an internal breaker but recommeded Kilo Amps Interrupt Current (KAIC)
rating is not to exceed 65 kA.
CAUTION: The Express 280 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.
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