IEC TR 60479-3:1998

FOREWORD
INTRODUCTION
1 General
      1.1 Scope
      1.2 General remarks
      1.3 Normative references
      1.4 Definitions
2 Characteristics of the impedance of the body of
      livestock
      2.1 Internal impedance of animals (Zi)
      2.2 Impedance of the hide and skin (Zp)
      2.3 Impedance (resistance) of the hoof (Zh, Rh)
      2.4 Total body impedance (ZT)
      2.5 Initial body resistance (Ro)
3 Values of the total body impedance (ZT)
4 Values of the initial resistance of the body (Ro)
5 Effects of livestock of sinusoidal alternating
      current in the range from 15 Hz to 100 Hz
      5.1 Threshold of reaction
      5.2 Threshold of immobilization
      5.3 Threshold of ventricular fibrillation
Bibliography
Figure 1 - Current flow and impedances of the relevant
           parts of the body of a cow for current path from
           the nose to the legs
Figure 2 - Diagrams for an animal, for a current path from
           the nose to the four legs (path A) and from the
           forelegs to the hindleys (path B)
Figure 3 - Diagram for the total body impedance for cattle
           for a percentage of 5 % of the population
Figure 4 - Ventricular fibrillation for sheep
Figure 5 - Minimum fibrillating currents of sheep as a
           function of weight for a shock duration of 3 s
Figure 6 - Minimum fibrillating currents (average) of
           various species of livestock as a function of
           weight for a shock duration of 3 s
Table 1 - Impedance (resistance) of the hooves of cattle
          (Zh, Rh) for a.c. voltages up to 230 V, 50/60 Hz
Table 2 - Total body impedances ZT for a.c. 50/60 Hz for
          cattle for touch voltages up to 230 V
Table 3 - Initial body resistance Ro for cattle
Table 4 - Threshold of ventricular fibrillation for a.c.
          50/60 Hz for different species of livestock, for
          a shock duration of 3 s

IEC TR 60479-3:1998 Provides basic guidance on the effects of electric currents on livestock for use in the establishment of electrical safety requirements. Indicates values for the electrical impedance of the body of livestock as a function of touch voltage, the degree of moisture of the hide or skin and the current path. Values are only available for cattle. Describes the effects of sinusoidal alternating current within the frequency range from 15Hz to 100 Hz pass through the body of livestock. It has the status of a horizontal standard in accordance with IEC Guide 104.