PD IEC/TS 60479-1:2005+A1:2016 - Effects of current on human beings and livestock. General aspects

PD IEC/TS 60479-1:2005+A1:2016

Effects of current on human beings and livestock. General aspects

Status : Superseded, Withdrawn   Published : January 2006 Replaced By : BS IEC 60479-1:2018

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For a given current path through the human body, the danger to persons depends mainly on the magnitude and duration of the current flow. However, the time/current zones specified in the following clauses are, in many cases, not directly applicable in practice for designing measures of protection against electrical shock. The necessary criterion is the admissible limit of touch voltage (i.e. the product of the current through the body called touch current and the body impedance) as a function of time. 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. The different parts of the human body (such as the skin, blood, muscles, other tissues and joints) present to the electric current a certain impedance composed of resistive and capacitive components.

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.

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.

Knowledge of the effects of alternating current is primarily based on the findings related to the effects of current at frequencies of 50 Hz or 60 Hz which are the most common in electrical installations. The values given are, however, deemed applicable over the frequency range from 15 Hz to 100 Hz, threshold values at the limits of this range being higher than those at 50 Hz or 60 Hz. Principally the risk of ventricular fibrillation is considered to be the main mechanism of death of fatal electrical accidents.

Accidents with direct current are much less frequent than would be expected from the number of d.c. applications, and fatal electrical accidents occur only under very unfavourable conditions, for example, in mines. This is partly due to the fact that with direct current, the letgo of parts gripped is less difficult and that for shock durations longer than the period of the cardiac cycle, the threshold of ventricular fibrillation is considerably higher than for alternating current.

NOTE

The IEC 60479 series contains information about body impedance and body current thresholds for various physiological effects. This information can be combined to derive estimates of a.c. and d.c. touch voltage thresholds for certain body current pathways, contact moisture conditions, and skin contact areas. Information about touch voltage thresholds for physiological effects is contained in IEC 61201.




Standard NumberPD IEC/TS 60479-1:2005+A1:2016
TitleEffects of current on human beings and livestock. General aspects
StatusSuperseded, Withdrawn
Publication Date12 January 2006
Withdrawn Date07 January 2019
Normative References(Required to achieve compliance to this standard)IEC 61201:1992, IEC Guide 104:1997
Informative References(Provided for Information)IEC TR 60479-3:1998, IEC 60990, IEC 60479-2:1987, IEC/TS 61201, IEC 60601-1
Replaced ByBS IEC 60479-1:2018
ReplacesPD 6519-1:1995, IEC 60479-1:1994
International RelationshipsIEC TS 60479-1:2005/AMD1:2016
Amended ByAmendment, August 2016; Corrigendum, September 2013
DescriptorsPhysiological effects (human body), Electric shocks, Electrical resistance, Testing conditions, Test equipment, Electrical safety, Safety, Direct current, Alternating current, Time, Electrical measurement, Electrical impedance, Electric current, Heart, Livestock, Skin (body), Human body
ICS13.200
29.020
Title in FrenchEffets du courant sur l'homme et les animaux domestique. Aspects generaux
Title in GermanWirkungen des elektrischen Stromes auf Menschen und Nutztiere. Allgemeine Gesichtspunkte
CommitteeJPEL/64
ISBN978 0 580 90939 9
PublisherBSI
FormatA4
DeliveryYes
Pages70
File Size2.496 MB
Price£254.00


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