ChargePoint Express 250 User manual

Express 250
DC Fast Charging Station
Site Design Guide
for Standalone and Paired Stations

ii
IMPORTANT SAFETY INSTRUCTIONS:
SAVE THESE INSTRUCTIONS
Product Disposal
To comply with Directive 2012/19/EU of the European Parliament and of the Council of 4 July
2012 on waste electrical and electronic equipment (WEEE), devices marked with this symbol
may not be disposed of as part of unsorted domestic waste inside the European Union. Enquire
with local authorities regarding proper disposal. Product materials are recyclable as marked.
No Accuracy Guarantee
Commercially reasonable efforts were made to ensure that the specifications and other information in this
manual are accurate and complete at the time of its publication. However, the specifications and other
information in this manual are subject to change at any time without prior notice.
WARNING:
1. Read and follow all warnings and instructions before installing and operating the ChargePoint®
Charging Station. Install and operate only as instructed. Failure to do so may lead to death, injury,
or property damage, and will void the Limited Warranty.
2. Only use licensed professionals to install your ChargePoint charging station and adhere to all
national and local building codes and standards. Before installing the ChargePoint® charging
station, consult with a licensed contractor, such as a licensed electrician, and use a trained
installation expert to ensure compliance with local building and electrical codes and standards,
climate conditions, safety standards, and all applicable codes and ordinances. Inspect the charging
station for proper installation before use.
3. Always ground the ChargePoint charging station. Failure to ground the charging station can
lead to risk of electrocution or fire. The charging station must be connected to a grounded, metal,
permanent wiring system, or an equipment grounding conductor shall be run with circuit
conductors and connected to the equipment grounding terminal or lead on the Electric Vehicle
Supply Equipment (EVSE). Connections to the EVSE shall comply with all applicable codes and
ordinances.
4. Install the ChargePoint charging station on a concrete pad using a ChargePoint approved
method. Failure to install on a surface that can support the full weight of the charging station can
result in death, personal injury, or property damage. Inspect the charging station for proper
installation before use.
5. This charging station is not suitable for use in or around hazardous locations, such as near
flammable, explosive, or combustible materials.
6. Do not use this product if the enclosure, EV cable, or the EV connector is broken, cracked,
open, or shows any other indication of damage.
7. Do not put fingers into the electric vehicle connector.
Important: Under no circumstances will compliance with the information in this manual relieve the
user of his/her responsibility to comply with all applicable codes or safety standards. This document
describes the most commonly-used installation and mounting scenarios. If situations arise in which
it is not possible to perform an installation following the procedures provided in this document,
contact ChargePoint, Inc. ChargePoint, Inc. is not responsible for any damages that may result
from custom installations that are not described in this document or for any failure to adhere to
installation recommendations.

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Copyright and Trademarks
©2013-2019 ChargePoint, Inc. All rights reserved. This material is protected by the copyright laws of the United
States and other countries. It may not be modified, reproduced or distributed without the prior, express written
consent of ChargePoint, Inc. CHARGEPOINT is a U.S. and European Union registered trademark and service
mark of ChargePoint, Inc. and cannot be used without the prior written consent of ChargePoint.
Symbols Used in This Document
This guide and product use the following symbols:
DANGER: Risk of electric shock.
WARNING: Risk of personal harm or death.
CAUTION: Risk of equipment or property damage.
Important: Crucial step for installation success.
Read the manual for instructions.
Ground/protective earth.

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Contents
1 Site Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pairing Two Express 250s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Initial Site Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Plan for Future Charging Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Charging Station Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Civil and Mechanical Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Drainage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Wheel Stops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Bollards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Pairing Previously Installed Charging Stations . . . . . . . . . . . . . . . . . . 14
Accessibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Signage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Electrical Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Upstream Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Transformer Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
AC Disconnect Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
RCD Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Grounding/Earthing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Shunt Trip Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Conduit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Wiring Requirements for Standalone Stations . . . . . . . . . . . . . . . . . . 22
Additional Wiring Requirements for Paired Stations . . . . . . . . . . . . . 22
Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cellular Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4 The Express 250 Concrete Mounting Template . . . . . . . . . . . . . . . . 27
Bring Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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CPE250-CMT Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Assemble the CPE250-CMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Install the CPE250-CMT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Appendix A Examples of Express 250 Paired Wire Sizing. . . . . . . . . . 33

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Site Design Guidelines
This document describes how to design an installation site for the ChargePoint® Express 250 DC fast
charging station, and install the Concrete Mounting Template, before station installation.
The Express 250 is a DC fast charging station for electric vehicles. Each charging station
communicates with ChargePoint using a cellular network. This connectivity is required for
diagnostics and reporting, as well as communication with the online dashboard that allows the
station owner to control its settings and commands. See the section Cellular Connectivity (page 26)
for detailed information.
Access ChargePoint documents online at chargepoint.com/guides or chargepoint.com/eu/guides
for each phase of the project:
Installing the Express 250 requires two people and takes approximately 3-4 hours. This time
estimate does not include the time needed to pull DC and Ethernet cable for a Paired installation if
it is not already done. Paired installation might also require contacting a ChargePoint support
technician to perform any required software updates and configuration if a station is being
Important: Always follow all applicable local and national codes and requirements. A site
drawing should be engineered for your specific site to reduce installation costs and
ensure compliance with local codes. Local authorities might not allow a unit to operate if
it is not installed to code.
Document Content Audiences
Express 250 Data Sheet Full station specifications Site designer, installer, and
station owner
This document Civil, mechanical, and electrical
guidelines to scope and construct the site
Site designer or engineer
of record
Concrete Mounting Template
Guide
Onsite instructions for installing the CMT
with anchor bolts and conduit placement
Site construction
contractor
Express 250 Installation Guide Anchoring, wiring, and powering on Installer
Express 250 Operations and
Maintenance Guide
Operation and preventative maintenance Station owner or facility
manager
Full set of Field Replacement
Guides
Component replacement procedures Station owner or third
party servicer

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retrofitted from Standalone to Paired.
Pairing Two Express 250s
The Express 250 can be installed either as a standalone system, or paired with another Express 250
using a DC connection to more flexibly share load. The two Power Modules in the base of each
charging station can be shared in any combination according to charging need. This allows high
power output in sites with space constraints.
To pair two Express 250 charging stations, all of the following are required:
•Additional conduit, ducting, or armored cable (according to region) correctly installed between
the two charging stations for DC conductors and Ethernet wiring
•Both Express 250s must have 62.5 kW power enabled (not allowed on stations only enabled for
50 kW)
•Both Express 250s must be provisioned for full power back to the panel (not allowed on “power
select” stations)
Initial Site Guidelines
An onsite evaluation is needed to determine conduit and wiring requirements from the panel to the
proposed parking spaces, as well as to measure cellular signal levels and identify suitable locations
for any necessary cellular signal booster equipment.
If you have pre-existing infrastructure or are using your own preferred electrical contractor to
prepare your site, a completed Construction Signoff Form is required to certify compliance with
electrical specification requirements, and to ensure everything was prepared to ChargePoint
specifications.
Plan for Future Charging Capacity
ChargePoint recommends that you plan to install charging stations for 5-10% of parking spaces, or
Important: All installers must be licensed electricians and complete an online training
course to become a ChargePoint certified installer. Installers who do not complete
installation training cannot access the ChargePoint Network to complete pinpointing and
station setup.To complete online training and become a certified installer, refer to
ChargePoint University at: chargepoint.com/installers or chargepoint.com/eu/installers
Important: Always check local codes or consult an engineer to ensure the site is prepared in
compliance with all applicable regulations. Local authorities might not allow a unit to
operate if it is not installed to code.

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10-15% for high EV adoption areas like California. Designing electrical infrastructure to support
current and future needs for EV charging helps avoid costly upgrades later as demand for EV
charging grows.
Consider these methods to prepare a site for future charging stations in a later phase of work:
•Add extra capacity if electrical panels are being upgraded now
•Use sub-panels as a way to shorten electrical paths
•Oversize the conduit between the main electrical panel and future stations
•Install pull or junction boxes at the end of an existing row of charging stations, to ease cable
pulls for future stations
•If a junction box or disconnect will be installed between rows of stations, oversize the wiring
between the main panel and the junction box to prevent needing to re-pull wire later
Charging Station Placement
To help minimize costs, choose station locations that are as close as possible to the available
electrical infrastructure. Selecting these types of locations helps minimize long conduit and wire
runs, as well as any trenching work.
Layout considerations:
•Determine appropriate ground anchoring locations where concrete exists or can be installed (no
asphalt surfaces).
•Consider locations where it will be easy to add future stations.
•Determine optimum conduit layout to minimize linear conduit costs to multiple parking spaces.
If possible, avoid or minimize trenching requirements, especially more costly trenching to run
conduit under asphalt surfaces.
•Evaluate existing electrical infrastructure to determine if the existing utility service and electrical
panel capacity is sufficient. Identify costs for any necessary upgrades and/or a new dedicated
electrical panel. ChargePoint recommends using a certified electrician to evaluate available
capacity and identify any upgrades that may be required.
•If a dedicated EV electrical panel is required, choose a panel location in close proximity to the
existing electrical supply.
•Measure cellular signal levels to ensure adequate cellular coverage at the station installation
location. To ensure adequate signal strength in underground or enclosed parking structures,
cellular repeaters may be required. For more information, see Cellular Connectivity (page 26).
•ChargePoint recommends to avoid locations under trees where sap, pollen, or leaves would fall
on the charging station and increase the station owner’s site upkeep workload.
WARNING: The ChargePoint charging station must be installed on a level concrete base.
Asphalt cannot support the full weight of the charging station. Failure to install the
ChargePoint charging station on a level concrete base may cause the charging station to
tip over, resulting in death, personal injury, or property damage.

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•For stall parking, ChargePoint recommends using
perpendicular parking stalls that allow a vehicle to
enter either front-first or rear-first, to better
accommodate the varied charge port locations on
different EVs. Diagonal stall parking is not advised.
Note: While ChargePoint tests charging stations
with a majority of upcoming vehicles, ChargePoint
cannot guarantee the port locations of future
vehicles and cannot warrant the configurations
proposed will work for all vehicles.
•Choose adjacent parking spaces in an area with
adequate lighting.
•Consider how easily drivers can find the stations
they need to access.
•Check local requirements for accessibility and pathway width, sometimes called “path of
travel”, to ensure station placement does not restrict sidewalk use.
•Building a pad into the head of a parking space (instead of on the sidewalk) is allowed if a) local
code allows it compared to the minimum parking space length, and b) the pad meets all pad
requirements listed in this document.
•Note that the Express 250’s two charge cables are different types of connectors to maximize
usability across EV models. The cables cannot both be used at the same time. Therefore, do not
position an Express 250 to share two parking spots.
•Pull-through parking (gas station model) is not recommended. If pull-through parking is used,
ChargePoint recommends placing at least one charging station on each side of the island. This
avoids situations where the charging station is on the opposite side of the vehicle from the
charge port. Guidance for station placement in island or curbside parking is shown below.
Important: Place each
charging station centered at
the head of its parking space,
with the touchscreen facing
the vehicle. This placement
maximizes cable reach for
the varied charge port
locations on different EVs.
a. 3.76 m (148 in)
b. 609 mm (24 in)

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a. Distance from left space marking: 3048 mm (120 in) maximum
b. Distance from right space marking: 4876.8 mm (192 in)
c. Distance from curb: 457.2 mm (18 in)
d. Cable reach radius: 3.76 m (148 in)
e. Example EV length: 4978.4 mm (196 in)
f. Recommended parking space length: 7924.8 mm (312 in)
g. Recommended parking space width: 2743.2 mm (108 in)

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Civil and Mechanical Design
Use the guidance below to design the civil and mechanical aspects of the site.
Component Dimensions and Weights
The Express 250 is a vertical enclosure with
the dimensions shown here.
Component Weight
Each Power Module 44 kg
(97 lb)
Crated Power Module as
shipped
49.9 kg
(110 lbs)
Express 250 with two Power
Modules, installed
339 kg
(746 lb)
Crated Express 250 as
shipped
494 kg
(1089 lb)
712 mm (28 in)
2230 mm
(87.8 in)
420 mm (16.5 in)
~ 1118 mm (44 in)

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Pad
The station can be installed on either a newly poured pad or an existing concrete surface. The
mounting surface must be smooth and cannot exceed a slope of 6.35 mm per 304.8 mm (0.25 inches
per foot).
The concrete pad must either be designed to be site-specific, or must meet these specifications:
•At least 305 mm (12 in) deep (or deep enough to be 305 mm (12 in) below the frost line)
•At least 1296 mm (51 in) on each side
•Contains #4 rebar or larger, top and bottom, 305 mm (12 in) on center
•Concrete 2500 PSI minimum
The above pad specifications are designed to meet these conditions:
•170 mph wind speed
•Wind Risk Category I
•Wind Exposure D
•Seismic Importance Factor 1.0
•Hayward Fault with mapped spectral response accelerations Ss=2.45 S1=1.019
•Seismic Design Category E
•Foundation of Sandy Soil with allowable stress = 1500 psf, Cd = 1.33
In some extreme conditions, a larger pad would be required. For sites with less stringent seismic,
soil, or wind conditions, a smaller pad might be possible.
If the existing pad does not meet the specifications above, it must be inspected and approved by a
structural engineer for the Express 250’s dimensions and weight. If needed, give these structural
design specifications to the structural engineer for verification:
Product Weight 340 kg (750 lbs)
Product Height from Ground 2.230 m (7.317 ft)
Product Width 0.71 m (2.33 ft)
Product Frontal Area Height * Width
CG Height 1.12 m (3.66 ft)
Number of Anchor Bolts 4
Bolt Pattern See dimensioned images in this section
Anchor Bolt Size M16 (5/8 in)
Anchor Bolt Embedment 229 mm (9 in)

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Drainage
Ensure any site slopes, walls, or fencing do not trap water around the charging station installation
site. The system is only built to withstand 457.2 mm (18 in) of standing water.
Mounting Specifications
The Express 250 is installed on a concrete
pad. Details on how to prepare this pad are
described later in this guide.
All installations require four anchor bolts
(a). Standalone installations only require
the two conduit stub-ups on the left side,
for AC wiring and shunt trip wiring (b).
Paired installations also require the wiring
shown on the right: DC wiring and Ethernet
communication (c). For more detail, see
Conduit (page 21).
WARNING: If not installed correctly, the ChargePoint® charging station may pose a fall
hazard, leading to death, personal injury, or property damage. Always use the provided
Concrete Mounting Template or a ChargePoint-approved surface mounting solution to
install the ChargePoint® charging station and install in accordance with applicable codes
and standards using licensed professionals. Non-approved installation methods are
performed at the risk of the contractor and void the Limited Warranty.
WARNING: Exposing the ChargePoint® charging station to over 18 inches (457 mm) of
standing water could create an electrocution, shock, or fire hazard. Cut power to the
charging station if it has been exposed to standing water and contact ChargePoint before
the charging station is powered on.
Important: Although the Concrete Mounting Template was originally designed for six
anchor bolts, only the four corner anchor bolts are required for station stability. Newer
charging stations are designed to only use the four corner anchor bolts. If older sites were
already designed with six anchor bolts, removing the middle bolts is not required.
WARNING: If not installed correctly, the ChargePoint® charging station may pose a fall
hazard, leading to death, personal injury, or property damage. Always use the provided
Concrete Mounting Template shown pre-installed in the Introduction, or a ChargePoint-
approved surface mounting solution, to install the ChargePoint® charging station. Always
install in accordance with applicable codes and standards using licensed professionals.
Non-approved installation methods are performed at the risk of the contractor and void
the Limited One-Year Parts Exchange Warranty.

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Clearances
The Express 250 requires minimum functional and service clearances as listed in the table below.
* Side clearance is measured from extrusion to extrusion.
** Side clearance can be shared between two charging stations. However, if the charge handles of
both stations are facing each other, add an extra 254 mm (10 in).
Measurements are provided in millimeters (inches).
a. Service clearance of open space (not necessarily at system grade)
b. Power Module service clearance at grade from the front right anchor, extending 1700 mm (67
in) to the left, without any permanent obstructions (fencing, bollards, wheel stops, etc.)
Note: Listed side clearances are the minimum required for operation and service. For paired
charging stations, the bend radius of the DC cable and conduit might require spacing them further
apart.
Rear clearance, and the front and side clearance for Power Module service, must be at grade level
+/- 25 mm (1 in).
Refer to the “Ventilation” section, and check local and regional code, for any additional clearance
requirements.
Front Clearance 330.2 mm (13 in) at grade; 609.6mm (24 in) minimum open space
Side Clearance* 711.2 mm (28 in) required; 863.6 mm (34 in) recommended**
Rear Clearance 304.8 mm (12 in) required; 609.6 mm (24 in) recommended
Top Clearance 304.8 mm (12 in)
280
(11)
352
(14)
1305
(51.4)
610
(24)
63 (2.5)
666
(26)
1700
(67)
851
(33.5)
271
(10.7)
454
(17.9)

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Ventilation
Ensure that any installation, especially an indoor installation, has adequate airflow to dissipate the
charging station’s heat at maximum operation. Each Express 250 charging station emits
approximately 3.3 kW of waste heat at maximum operation.
The charging station location must allow fresh ambient airflow. Restriction of airflow might result in
reduced maximum performance. Do not install a station where it is exposed to air that is heated
above ambient temperatures.
In addition to the service clearances listed in the “Clearances” section, consider these figures for site
layout:
•If a charging station will have a wall directly behind it, minimum rear clearance is 305 mm
(12 in).
•If two Express 250 charging stations will be positioned back to back, increase the rear clearance
to a shared 610 mm (24 in) for both stations to reduce exhaust recirculation.
Wheel Stops
Bollards and wheel stops are not explicitly required by ChargePoint. However, ChargePoint
recommends these best practices and considerations when designing the site:
•Permanent bollards or wheel stops must not encroach upon the Power Module clearance listed
in the clearance diagram above. Removable bollards are allowed if service personnel have the
ability to move them as needed.
•Where permitted by code, wheel stops are preferred over bollards for head-in or back-in
spaces.
•When using wheel stops, consider the average vehicle overhang distance from tire to bumper
(passenger, bus, etc.), as well as leaving space for the driver to walk up and access the
touchscreen. General recommended distances are shown in the wheel stop image below.
•Position wheel stops to actively block at least one wheel, without presenting a trip hazard to
pedestrians walking between vehicles.

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a. Wheel stop, positioned to actively block at least one wheel
b. Cable reach radius: 3.76 m (148 in)
c. Recommended distance for walk-up access: 609 mm (24 in)
d. Recommended distance between wheel stop and Express 250: 1371 mm (54 in) for passenger
vehicles
Note: For fleet or commercial use, measure the rear or front overhang of the largest vehicle in use,
depending on charge port location.
Bollards
Bollards and wheel stops are not explicitly required by ChargePoint. However, ChargePoint
recommends these best practices and considerations when designing the site:
•Permanent bollards or wheel stops must not encroach upon the Power Module clearance listed
in the clearance diagram above. Removable bollards are allowed if service personnel have the
ability to move them as needed.
CAUTION: Shorter wheel stops that are installed in the center of a parking spot can fit
between the wheels of a larger vehicle and not prevent forward motion.

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•Where permitted by code, wheel stops are preferred over bollards for head-in or back-in
spaces.
•When bollards are required by code, needed for snowy areas, or needed for curbside spaces,
ensure bollard placement does not interfere with removing and replacing charge cables in the
station’s side holsters. General recommended distances are shown in the bollard images below.
•Try to minimize bollard interference with the movement of charge cables between the station
and the vehicle. Bollards are recommended to be no taller than 914 mm (36 in) where needed.
•No bollard can be placed within 457 mm (18 in) of the station, as measured on-center.
Curbside bollard installation:
a. Use and service clearance of open space (not necessarily at grade)
b. Unobstructed front service clearance at grade

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Head-in or back-in space bollard installation:
Pairing Previously Installed Charging Stations
If all site construction for paired charging is completed in advance, Express 250 stations can be
initially installed as Standalone and paired at a later date. In that case, follow these additional steps:
•During initial site construction, install DC and communication conduit or ducting (as applicable
by region) in advance.
•Extend side clearance at both DC conduit stub-up locations to 1.2 m (4 ft) to allow space for
cable pulling equipment.
•Run a pull rope through the larger DC conduit before landing the charging stations. Do not pull
DC cable in advance, as it is too thick to hide inside the cover panels without risking damage or
unwanted electrical contact.
•Install a fishing tape in the smaller communication conduit to assist with routing the Ethernet
cable later. If Ethernet is pulled in advance, leave 317.5 cm (125 in) of wire above grade at each
end.
•Use duct seal compound to seal the ends of the DC and communications conduit stub-ups. Seal
the ends of the fishing tape to hang outside the conduit.
•Install the cover panels and extrusions on the Express 250 stations over the stub-ups as normal.
By only connecting AC wiring (and shunt trip if applicable), each Express 250 can perform as a
Standalone station until the station owner is ready to pair them. At a later time, the stations can be
paired by installing DC conductors, connecting Ethernet communication, and performing a firmware
update if required. Refer to the Express 250 Installation Guide for further details.
Once two Express 250s are correctly paired, operation of both stations is inhibited if Ethernet