IEC publication updated in defines four zones of current- magnitude /time-duration, in each of which the pathophysiological. IEC TS Effects of current on human beings and livestock -. Part 1: General aspects. • IEC TS Effects of current on. IEC/TR Edition TECHNICAL. REPORT. RAPPORT. TECHNIQUE. Effects of current on human beings and livestock –. Part 5: Touch.
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Contact with live part Direct contact.
The values of body impedance depend on a number of factors and, in particular, on current path, on touch voltage, duration of current flow, frequency, degree of moisture of the skin, surface area of contact, pressure exerted and temperature. It has the status 604479 a horizontal standard in accordance with IEC Guide Its passage affects essentially the muscular, circulatory and respiratory functions and sometimes results in serious burns.
Contents 1 – Introduction 1. Contact with parts in fault conditions Indirect contact.
Views Page Talk View source History. The necessary criterion is the admissible limit of 600479 voltage i. The degree of danger for the victim is a function of the magnitude of the current, the parts of the body through which the current passes, and the duration of current flow.
The different parts of the humanbody such as the skin, blood, muscles, other tissues and joints present to the electric current a certain impedance composed of resistive and capacitive components. When a current exceeding 30 mA passes near the heart of a human body, the person concerned is in serious danger if the current ie not interrupted in a very short time.
Characteristics of particular sources and loads. The protection of persons against electric shock in LV installations must be provided in conformity with appropriate national standards, statutory regulations, codes of practice, official guides and circulars etc.
How to contribute Play with sandbox Recent changes 64079. Main page How to browse and search Random page. Retrieved from ” http: Ventricular fibrillation unlikely to happen C 2 curve: Sizing and protection of conductors. Our prices are in Swiss francs CHF. Hazardous-live-parts shall not be accessible, and accessible conductive parts shall not be hazardous.
Standards and regulations distinguish two kinds of dangerous contact: The relationship between current and voltage is not linear because the impedance of the human body varies with the touch voltage, and data on this relationship is therefore required.
Residential premises and other special locations. The impedance values indicated in this technical specification result from a close examination of the experimental results available from measurements carried out principally on corpses and on some living persons.
The fault current raises the exposed-conductive-part to a voltage liable to be hazardous as it generates a touch current through a person coming into contact with this exposed-conductive-part see Fig.
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This refers to a person coming into contact with an exposed conductive-part which is not normally live, but has become live accidentally due to insulation failure or some other cause. Basic protection Fault protection. The following test report forms are related: Electrical fires are caused by overloads, short circuits and earth leakage currents, but also by electric arcs in cables and connections. This page was last modified on 23 Aprilat Chapter – Protection against electric shocks and electric fires.
MV and LV architecture selection guide for buildings.
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The contents of the corrigenda of October and June have been included in this copy. Energy Efficiency in electrical distribution.
Threshold of muscular reactions C 1 curve: Preview Abstract IEC Connection to the MV utility distribution network. TC 64 – Electrical installations and protection against electric shock rss.