High-voltage cables exist even under the ground.

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(News material)
The underground construction of high-voltage lines in downtown Seoul is 341km long with 152 sections in total.
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As a result of selecting seven of them and measuring them, electromagnetic waves exceeding 10mG were measured in most sections.
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KEPCO explains that it is less than 833mG, the domestic electromagnetic risk standard.
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[KEPCO official: I told you to comply with ?833mG, but it is a very small value, so you don't have to worry.]
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However, this is a risk criterion for temporary exposure only, there is no criterion for long-term exposure. .
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The Netherlands and Switzerland set standards for long-term exposure to electromagnetic waves of 4mG and 10mG.
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Where children live, such as schools or day care centers, can be a problem.
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If you look a little bit
Underground high voltage lines are really, really dangerous. .
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833mG is safe
Do you understand?
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Power is nothing without Control!