4. A load, 100 m from a 415 V Supply Authority point is connected by a35 mm2 pvc/swa/pvc copper...

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4. A load, 100 m from a 415 V Supply Authority point is connected by a35 mm2 pvc/swa/pvc copper cable. The current rating is 119 A and thevolt drop per ampere metre is 1.1 mV. If the load current is 90 A,determine whether the volt drop at the load is within the 17th Edition ofthe IEE Wiring Regulations 5% limit. Using TABLE 1, calculate theearth loop impedance, minimum fault current (neglect the supply/earthimpedance) and select an appropriate fuse for the circuit with reference toB.S. 88 part 2 (see FIGURE 3, Lesson 4 - 4).

David · Accepted Answer

for 35mm2 pvc/swa copper cable volt drop per ampere meter is 1.1mV 
first we need to find voltage drop in cable so we should not take actual current rating to calculate 
actual current rating=119A load current=90A 
length of cable=100m 
voltage drop in cable=1.

4. A load, 100 m from a 415 V Supply Authority point is connected by a35 mm2 pvc/swa/pvc copper cable. The current rating is 119 A and thevolt drop per ampere metre is 1.1 mV. If the load current is...

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