Q1Safety Figure 1 depicts an electric circuit created when a person touches a st
ID: 2315832 • Letter: Q
Question
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/Explanation / Answer
1a. Rg = 0.5 Rf = 1000
1.b Itouch = I/2
= 2.5 A
1.d touch voltage = Rg * Itouch
= 250 V
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