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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The fundamental rule of protection against electric shock is provided by the document IEC “Protection against electric shock — Common aspects for installations and equipment” which covers both electrical installations and electrical equipment. Electrical fires kec caused by overloads, short circuits and earth leakage currents, but also by electric arcs in cables and connections.
The different parts of the ie such as the skin, blood, muscles, other tissues and joints present to the electric current a certain impedance composed of resistive and capacitive components.
Characteristics of particular sources and loads.
Protection against electric shocks and electrical fires. The following test report forms are related: 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.
Residential premises and other special locations. Ventricular fibrillation unlikely to happen C 2 curve: 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.
TC 64 – Electrical installations and protection against electric shock rss. Preview Abstract IEC This page has been accessed 21, times. Threshold of muscular reactions C 1 curve: Do you need a multi-user copy? This page was last modified on 23 Aprilat How to contribute Play with sandbox Recent changes Help. Standards and regulations distinguish two kinds of dangerous contact: Threshold of perception of current B curve: Sizing and protection of conductors.
Connection to the MV utility distribution network.
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Personal tools Create account Log in. Relevant IEC standards include: This refers to a person coming into contact with an exposed conductive-part which is not normally live, but has become jec accidentally due to insulation failure or some other cause.
Chapter – Protection against electric shocks and electric fires. When a current exceeding 30 mA passes 6079 the heart of a human body, the person concerned is in serious danger if the current is not interrupted in a very short time.
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.
Contact with live part Direct contact.
Contact with parts in fault conditions Indirect contact. It has the status of a horizontal standard in accordance with IEC Guide 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.
Views Page Talk View source History. MV and LV architecture selection guide for buildings. Possibility of irreversible effects AC zone: 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.
Connection to the LV utility distribution network.