• Title/Summary/Keyword: Permissible Touch Voltage

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Grounding Electrode Design for the Reduction of Hazardous Voltage in Lightning Protection (위험전압 저감을 위한 피뢰설비용 접지전극의 설계)

  • Lee, B.H.;Lee, S.C.;Eom, J.H.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2071-2073
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    • 2000
  • Grounding electrode design is an important part in lightning protection, and the limit of hazardous voltages (step and touch voltages) below the permissible voltage for human body has been the main goal of grounding electrode design. In this paper, the grounding electrode for the reduction of hazardous voltages was designed and evaluated newly. It was known that the inclined auxiliary grounding conductors installed outside the grounding mesh grid are very effective to reduce the step and touch voltages.

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Hazard Assessment by Electric Shock both on the Ground and in the Water (지상과 수중에서 전격에 의한 위험성 평가)

  • Kim, Doo-Hyun;Kang, Dong-Kyu;Lee, Jong-Ho
    • Journal of the Korean Society of Safety
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    • v.19 no.2
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    • pp.26-33
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    • 2004
  • This study presents a hazard assessment of the human body exposed to electic shock considering various parameters which affect severity of the electric shock. The present study has two research objectives; one is no analyze hazards of the human body by the elctric shock both on the ground and in the water. The other is to understand the mechnism of the electric shock. In order to achieve these objectives the hazard of shock is estimated by comparing with physiological effects of electric curren througn the human body according to variation of shock parameters of shock circuits. The shock parameters adopted in this paper consist of body resistance, resistance of protective equipment, ground resistance, shock duration, depth of gound surface layer, relection factor, permissible touch voltage, body current and body voltage. Besides, safety standard determining hazard degree of the human body is introduced. And hazard of the human body due to the electric shock is quantitatibely assessed in consideration of data obtained by the method suggested herein, and final results are presented and discussed.

The Design Flowchart of Earthing System for Building Electrical Installations in Accordance with International Standards (국제표준에 따른 건축전기설비의 접지시스템 설계순서)

  • Lee, Ju-Cheol;Yeom, Jin-Geun;Jeong, Seung-Hyun;Byeon, Cheol-Gyun;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.8
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    • pp.113-120
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    • 2014
  • In this paper, designing of an earthing system in accordance with international standards with regard to 22.9kV-y multi-grounded neutral system is discussed and confirmed that the consumer's earthing system can be a part of a global earthing system by interconnecting its earthing system with the neutral conductor of 22.9kV-y multi-grounded system. Further, it is proposed that some modification of the earthing system design flowchart given in the international standards are necessary when considering the equipotential bonding, lightning protection, and telecommunications facilities as well as the basic safety requirements.