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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An electric shock is the pathophysiological effect of an electric current through the human body. Its passage affects essentially the muscular, circulatory and respiratory functions and sometimes results in serious burns.
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The degree of eic 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. Electrical fires are caused by overloads, short circuits and earth leakage currents, but also by electric arcs in cables and connections. Protection measures are described in Protection against electrical fire risks.
When a current exceeding 30 mA passes near 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 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 iex circulars etc.
Relevant IEC standards include: Possibility of irreversible effects AC zone: Threshold of perception of current B curve: Threshold of muscular reactions C 1 curve: Ventricular fibrillation unlikely to happen C 2 curve: The fundamental rule of protection against electric shock is provided by the document IEC “Protection against electric shock — Common aspects for installations and equipment” 604799 covers both electrical installations and electrical equipment.
Hazardous-live-parts shall not be accessible, and accessible conductive parts shall not be hazardous. This refers to a person coming into contact with a conductor which is live in uec circumstances see Fig.
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. 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. Contact with parts in fault conditions Indirect contact.
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Protection against electric shock – Electrical Installation Guide
Contact with live part Direct contact. Retrieved from ” http: Chapter – Protection against electric shocks and electric fires.
This page was last modified on 23 Aprilat This page has been accessed 21, times. Connection to the MV utility distribution network. Connection to the LV utility distribution network. MV and LV architecture selection guide for iwc. Protection against electric shocks and electrical fires. Sizing and protection of conductors. Energy Efficiency in electrical distribution. Characteristics of particular sources and loads. Residential premises and other special locations.
Contents 1 – Introduction 1. Standards and regulations distinguish two kinds of dangerous contact: Basic protection Fault protection.