This part of IEC provides basic guidance on the effects of shock current on human beings and livestock. For a given current path through the human body, the danger to persons depends mainly on the magnitude and duration of the current flow. The necessary criterion is the admissible limit of touch voltage i. 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.
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Protection against electric shocks and electrical fires. 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. 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. 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 and circulars etc.
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.
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 normal 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.
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Collaboration to this wiki is also open to all. Toggle navigation. About About this wiki How to browse and search How to contribute Help View source History. Protection against electric shock From Electrical Installation Guide. Home Protection against electric shocks and electrical fires Protection against electric shock. Jump to: navigation , search. Standards and regulations distinguish two kinds of dangerous contact: contact with live parts contact with conductive parts in fault conditions and corresponding protective measures: Basic protection Fault protection.
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