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Based on the following contents, what is the answer to the question "How to install the movable charger":

WARNING
Only connect the charging unit to a
grounded electric network.
Connect the Movable Charger to the main
power supply.
CAUTION
The AC plug is an optional part. If
the Movable Charger is delivered
without the AC plug, you must install
the AC plug before taking the
charging unit into use. You must be
an authorized electrician to install
the AC plug to the power cable.
Turn the equipment stop switch to ON
position. Wait until the charging unit is ready
for use. This may take a few seconds. The
status is indicated on the display.
MOVABLE CHARGER OWNER'S MANUAL
12 PUBLIC EN NORTH AMERICA MOVABLE CHARGER OWNER'S MANUAL V2.00 11/2022
The Movable Charger automatically
connects to the mobile data network using
the built-in 3G/4G/Wi-Fi function.
The wireless mobile data network
and the internet connectivity depend
on your local service provider's
network and its settings.
See the product datasheet for
specifications.
When the charging unit is ready to use,
select the input current according to your
main power supply. Push the info button on
the touch screen and select the correct input
current.
The feature for selecting the input
current must first be activated, e.g.
from the ChargEye backend system.
6.1 Fixed installation (optional)
You can install the Movable Charger in place. Remove the wheels and fasten the unit to
a mounting pad or other applicable surface. For installation instructions, see the
maintenance manual
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
No
3. If two experts were independently asked the question, will the final answer be exactly the same?
Yes

--- Answer ---
grounded