Siemens S5-155U System Manual page 40

System Manual
C79000-B8576-C199-03
Installation of Programmable Controllers for EMC
Grounding strips
If there are no large-area metal-to-metal connections, you must
connect inactive metal parts such as cabinet doors and supports
with grounding strips. These should be short and have a large
surface.
Cabinet members
The cabinet members should have a large-area connection to the
cabinet housing (metal-to-metal connection).
Mounting bracket for subrack
There must be a large-area metal-to-metal connection between
cabinet member and mounting bracket.
Signal lines
With shielded signal lines, the shield must be secured to the
protective conductor bar or an additionally fitted shield bar using
large-area cable clamps.
Cable clamp
The cable clamp must enclose and make contact with the shield
braid over a large area.
Shield bar
This bar must have a large-area connection to the cabinet
members (metal-to-metal connection). It serves for grounding the
cable shields.
Protective conductor bar
The protective conductor bar must have a large-area connection to
the cabinet members (metal-to-metal connection). The protective
conductor bar must be connected to the protective conductor
system via an external conductor (at least 10 mm
essential for providing a reliable path to ground for fault currents
and interference currents.
Conductor to the protective conductor system (ground point)
The conductor must have a large-area connection to the protective
conductor system (ground point).
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