Miele CS 1223-1 Operating And Installation Instructions page 9

Technical safety
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Installation, maintenance and repairs may only be carried out by
a Miele authorised service technician.
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A damaged appliance could be dangerous. Before installation,
check the appliance for visible signs of damage. Do not use a
damaged appliance.
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The electrical safety of this appliance can only be guaranteed if
connected to a correctly installed on-site earthing system which
complies with local and national safety regulations. It is most
important that this basic safety requirement is observed and
regularly tested, and where there is any doubt, the household wiring
system should be inspected by a qualified electrician.
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To avoid the risk of damage to the appliance, make sure that the
connection data (frequency and voltage) on the data plate
corresponds to the household supply, before connecting the
appliance to the mains supply.
Consult a qualified electrician if in any doubt.
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Do not connect the appliance to the mains electrical supply by a
multi-socket adapter or extension lead. These are a fire hazard and
do not guarantee the required safety of the appliance.
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For safety reasons, this appliance may only be used when it has
been built in.
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The wok must not be used in a non-stationary location (e.g. on a
ship).
Warning and Safety instructions
9