IEC TS 60479-1:2005
Effects of current on human beings and livestock - Part 1: General aspects

Standard No.

IEC TS 60479-1:2005

Release Date

2005

Published By

International Electrotechnical Commission (IEC)

Status

Be replaced

Replace By

IEC TS 60479-1:2005/COR1:2006

Latest

IEC TS 60479-1:2005/AMD1:2016

Replace

IEC/TR2 60479-1:1994

Scope

For a given current path through the human body, the risk to humans depends primarily on the value of the current and the time it is energized. However, in many cases, the time/current areas specified in the following clauses are not actually directly used in the design of electric shock protection. The allowable limit value of the contact voltage (that is, the product of the current passing through the human body and the impedance of the human body) as a function of time must be used as the criterion. Because the impedance of the human body changes with the contact voltage. Therefore, the relationship between current and voltage is not linear, so the relationship data needs to be given. The resistive and capacitive components presented by different parts of the human body, such as skin, blood, muscles, other tissues and joints to electric current, constitute human body impedance. The value of the body's impedance depends on several factors, in particular the path of the current, the contact voltage, the duration and frequency of the current, the degree of moisture of the skin, the contact surface area, the applied pressure and the temperature. The impedance values listed in this standard are mainly obtained by careful review of data obtained from measurements on corpses and a small number of living people. The effect of alternating current on the human body is basically based on the relevant research results on the effect of alternating current at the most commonly used frequency in electrical installations, 50 Hz or 60 Hz, but the data given are considered applicable to 15 Hz to 100 Hz Primarily, this chapter considers the risk of ventricular fibrillation as a major mechanism of fatal accidents. Judging from the number of DC applications, there are far fewer accidents with DC than expected, and fatal accidents only occur in very adverse situations, such as in mines; this is partly because the number of DC charged objects caught is relatively small. The ventricular fibrillation threshold for DC current is much higher than for AC when the shock duration is greater than the cardiac cycle. Note: GB/T 13870 includes information on human body impedance and human body current thresholds for various physiological effects. This information may be combined to allow for the assessment of AC and DC contact voltage thresholds for reference to certain human body current pathways, moist conditions of contact and skin contact area. Information on the physiological effects of contact voltage thresholds is included in GB/T 3805 Standard.

IEC TS 60479-1:2005 Referenced Document

• GB/T 3805-1993 Extra-low voltage (ELV) limit values
• IEC Guide 104:1997 The preparation of safety publications and the use of basic safety publications and group safety publications

IEC TS 60479-1:2005 history

• 2016 IEC TS 60479-1:2005/AMD1:2016 Amendment 1 - Effects of current on human beings and livestock - Part 1: General aspects
• 2013 IEC TS 60479-1:2005/COR2:2013 Effects of current on human beings and livestock - Part 1: General aspects; Corrigendum 2
• 2006 IEC TS 60479-1:2005/COR1:2006 Effects of current on human beings and livestock - Part 1: General aspects; Corrigendum 1
• 2005 IEC TS 60479-1:2005 Effects of current on human beings and livestock - Part 1: General aspects
• 1970 IEC TS 60479-1:1994 Effects of current on human beings and livestock - Part 1: General aspects
• 1970 IEC TS 60479-1:1984 Effects of current passing through the human body - Part 1: General aspects - Chapter 1: Electrical impedance of the human body - Chapter 2: Effects of alternating current in the range of 15 Hz to 100 Hz - Chapter 3: Effects of direct current