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Electrical Design
The default Express 250 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, or
use armored cable, as required 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 (CPE250-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 250 charging stations as Standalone initially and pair them
at a later date, if desired. In this case, install the DC and Ethernet conduit per Pairing Previously
Installed Charging Stations (page 14), 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 250 requires a service panel breaker as follows:
The Express 250 does not contain an internal breaker. Therefore, its KAIC rating (KiloAmps
Nominal Voltage Max AC Current Circuit Breaker Size
400 VAC (EU) 96 A 125 A
480 VAC (NA) 80 A 100 A (125% continuous load required for N. America)
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