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Electrical Installation
60
11/01 AWB2700-1426GB
Ensuring Electromagnetic Compatibility
The EMC of XI/ON modules is guaranteed if the following
basic rules are adhered to during installation:
• Correct and large surface grounding of inactive metal
components
• Correct shielding of cables and devices
• Proper cable routing - correct wiring
• Creation of a standard reference potential and grounding
of all electrically operated devices.
• Special EMC measures for special applications
Grounding of Inactive Metal Components
All inactive metal components (for example: switchgear
cabinets, switchgear cabinet doors, supporting bars, moun-
ting plates, top-hat rails and so forth) must be connected to
one another over a large surface area and with a low impe-
dance (grounding). This guarantees a standardized reference
potential area for all control elements. The influence of
coupled disturbances is reduced.
• In the areas around screw connections, the painted
anodized or isolated metal components must be freed of
the isolating layer. Protect the points of contact against
rust.
• Connect all free moving groundable components (cabinet
doors, separate mounting plates and so forth) by using
short bonding straps to large surface areas.
• Avoid the use of aluminum components, because its quick
oxidizing properties make it unsuitable for grounding.
PE Connection
A central connection must be established between ground
and PE connection (protective earth).
The grounding must never - even inadvertently - take on a
dangerous touch potential. Therefore, always protect the
ground potential with a protective cable.
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