Siemens S5-135U/155U - Manual (Page 36)

3-10
System Manual
C79000-G8576-C199-06
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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.
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Cabinet members
The cabinet members should have a large-area connection to the
cabinet housing (metal-to-metal connection).
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Mounting bracket for subrack
There must be a large-area metal-to-metal connection between
cabinet member and mounting bracket.
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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.
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Cable clamp
The cable clamp must enclose and make contact with the shield braid
over a large area.
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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.
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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
2 ). This is essential for
providing a reliable path to ground for fault currents and interference
currents.
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Conductor to the protective conductor system (ground point)
The conductor must have a large-area connection to the protective
conductor system (ground point).
Installation Guidelines