Guidelines for Electrical Installation
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8.3
Electromagnetic compatibility (EMC)
BL20 products comply in full with the requirements pertaining to EMC regulations. Nevertheless, an
EMC plan should be made before installation. Hereby, all potential electromechanical sources of
interference should be considered such as galvanic, inductive and capacitive couplings as well as
radiation couplings.
8.3.1
Ensuring electromagnetic compatibility
The EMC of BL20 modules is guaranteed when the following basic rules are adhered to:
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.
8.3.2
Grounding of inactive metal components
All inactive metal components (for example: switchgear cabinets, switchgear cabinet doors, sup
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porting bars, mounting plates, top-hat rails, etc.) must be connected to one another over a large sur
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face area and with a low impedance (grounding). This guarantees a standardized reference poten
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tial area for all control elements and reduces the influence of coupled disturbances.
In the areas of 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, etc.)
by using short bonding straps to large surface areas.
Avoid the use of aluminum components, as its quick oxidizing properties make it unsuitable for
grounding.
8.3.3
PE connection
A central connection must be established between ground and PE connection (protective earth).
8.3.4
Earth-free operation
Observe all relevant safety regulations when operating an earth-free system.
WARNING
Grounding of inactive metal components
Danger to life due to dangerous contact voltage
†
Connect earth to the protective conductor
Summary of Contents for BL20-ECO
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