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. | Chapter F Protection against electric shocks Contents 1 General Electric shock F2 F2 Protection against electric shock F3 Direct and indirect contact F3 2 Protection against direct contact F4 Measures of protection against direct contact F4 Additional measure of protection against direct contact F6 3 Protection against indirect contact F6 Measures of protection two levels F6 Automatic disconnection for TT system F7 Automatic disconnection for TN systems F8 Automatic disconnection on a second fault in an IT system F10 Measures of protection against direct or indirect contact without automatic disconnection of supply F13 4 Protection of goods in case of insulation fault F17 Measures of protection against fire risk with RCDs F17 Ground Fault Protection GFP F17 5 Implementation of the TT system F19 Protective measures F19 Coordination of residual current protective devices F20 6 Implementation of the TN system F23 Preliminary conditions F23 Protection against indirect contact F23 High-sensitivity RCDs F27 Protection in high fire-risk locations F28 When the fault current-loop impedance is particularly high F28 7 Implementation of the IT system F29 Preliminary conditions F29 Protection against indirect contact F30 High-sensitivity RCDs F34 Protection in high fire-risk locations F35 When the fault current-loop impedance is particularly high F35 8 Residual current differential devices RCDs F36 Types of RCDs F36 Description F36 Sensitivity of RDCs to disturbances F39 Schneider Electric - all rights reserved Schneider Electric - Electrical installation guide 2010 1 04 12 2009 12 0 F - Protection against electric shock 1 General F2 When a current exceeding 30 mA passes through a part 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
