Q1Safety Figure 1 depicts an electric circuit created when a

Q1Safety Figure 1 depicts an electric circuit created when a person touches a steel structure that is live d a fault in the electrical installation. The structure is grounded by a metal rod 6 cm in diameter. rod is driven 2 m into the ground. The surrounding soil is dry earth. Assume that the resistance the person\'s body is 2000 tg man 0.5 R Figure 1 1.aDraw a full circuit diagram corresponding to the circuit shown in Figure 1 Include a current source for the current markS 1.b Calculate the ground resistance Ro of the earth electrode marks Assuming that I-5 A: Find the touch current Itouch marks 1.d Calculate the touch voltage [2 marks/ I time of the person by using Dalziel\'s formula person\'s weight is 80 kg Comment on the person\'s chance on survival f the earth electrode was anchored in wet soil, would the person\'s chance at [2 marks/ 1.f [2 marks/ 1.f survival improve? [4 marks/

Solution

1a. Rg = 0.5 Rf = 1000

1.b Itouch = I/2

= 2.5 A

1.d touch voltage = Rg * Itouch

= 250 V