Siemens SIMATIC Panel PC 870 Equipment Manual page 23

230 V supply voltages outside the U.S.A. and Canada
Use flexible cable featuring the following design properties: conductor cross
section at least 18 to AWG and grounding–type plug 15 A / 250 V. Make sure that
the cable set complies with the safety standards of the country where the devices
will be installed and that they bear the relevant markings.
Equipotential bonding
Low-resistance grounding connections ensure that the user of the installation is
protected against electric shock (for example, if a short-circuit occurs or if there are
defects in the system). Moreover, they discharge interference transmitted by
external power supply cables, signal cables or cables to I/O devices.
You should therefore create a low-resistance connection (a large surface acting as
the contact) between the grounding point on the system housing and the central
grounding point of the cabinet or the installation in which the computer is to be
installed. The minimum cross-section should not be less than 5 mm
The grounding terminal is located on the side of the device and is identified by a
symbol.
Turning off the computing unit
The computing unit does not have a mains switch and is isolated from the mains
supply only by detaching the mains supply plug.
Panel PC 870 Computing Unit Equipment Manual
Edition 12/01
Starting Up the Computing Unit
2
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2-5