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Inductance coupling.
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Electromagnetic wave radiation.
Common impedance (including the grounding system) coupling.
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To prevent EMI, use the following guidelines:
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE) to
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filter interference from the power grid.
Keep the switch far away from radio transmitting stations, radar stations, and high-frequency
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devices.
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Use electromagnetic shielding when necessary. For example, use shielded interface cables.
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