Introduction to Electrical Engineering

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Pro: ČEKO IMPORT a.s.
Vydal: České vysoké učení technické Praha Autor: Vladimír Kůla, Michal Kříž

Strana 26 z 112

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.g. Conventional touch voltage limit The highest permissible touch voltages (conventional touch voltage limits) are given in Table 4.1 (according the draft ČSN 2000-4-41). 4. Regarding all these conditions the safety limits the touch voltage were stated. The current, which flows through the human body, depends not only the touch voltage and body impedance but also the impedance the surface which the human being stands which touched, and also the conditions the surface. The impedance the surface, which touched man, much lower when the surface damp wet and also the impedance the human body lower when wet (e. Figure 4. consequence perspiration).4.EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY 27 population.4.3.1 Statistical values total body impedance valid for live human beings for the current path hand hand hand foot, for touch voltage 700 V