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Installation Rules Past Exam Papers: Paper 2 Exam Question:

Name FOUR different methods of how the voltage drop of a cable can be determined and give examples for each method.ANSWER: EXAMPLE: Suppose a balanced three phase load of 100A is to be supplied using a 35mm2 copper cable over a distance of 100m. Calculate the Voltage Drop (USING FOUR DIFFERENT METHODS).

Installation Rules Past Exam Papers: Paper 2 Exam Question: QUESTION 1: SANS 10142 PART 1 OF 2008: ANNEXURE E: VOLT DROP (COMPULSORY)

1.1 With reference to FIGURE 1, on the DIAGRAM SHEET (attached), calculate the following: 1.1.1 The total volt drop of the supply (4) 1.1.2 The total resistance of the supply cable (1) 1.1.3 Test the answer in QUESTION 1.1.1 above by making use of any other method. (3) 1.2 By making use of TABLE E1 (attached) only, calculate the actual length of a 10 mm2 copper ECC conductor if the total resistance of the conductor is 0,22 ohm. (2)

Installation Rules Past Exam Papers: Paper 2 Exam Question:

Refer to figure 4 and calculate the following: 1. Calculate the minimum cable size for the loads. 2. Touch voltage at L3. 3. PSCC at L1 NOTE: Use a three core cable and ignore suppliers transformer and mains supply characteristics. FIGURE 4 CIRCUIT DIAGRAM NOT ACCORDING TO SCALE We have Installation Rules Paper 1 study guide as well. The installation rules study guides consists of a selection of questions and answers similar to the ones you will find on the official exam. All you need to do is use your Regulation Book to answer the questions in each study guide and attempt as many questions as you can that will be generated by the Exam Generator software. Then, once that is done you will be ready to take the exam. Why Use This Study Material? The study material is a no-nonsense guide for the Installation Rules Paper 1 exam and Installation Rules Paper 2 exam. It focuses on the areas most likely to be on the exam (9 out of 10 Questions generated by the installation rules Exam Generator Software will be in the actual exam), plus it provides background information to help you understand some of the more complex concepts and detailed, step by step calculation examples. The focus is on preparing you for the exams and to shorten your preparation time for your exams. The study material offers a self-paced method of preparing yourself for the exams. You do not have to guess what to study; every Module gives you an in depth questions, detailed coverage, and review questions (NO GARBAGE). This step-by-step structure identifies what you need to study, gives you all the facts, and rechecks what you know. If you work very hard, you can pass both papers with distinctions.

Installation Rules Past Exam Papers: Paper 2 Exam Question: Question 1 Installation Rules Paper 2

A 1kW single phase electrical motor is used as part of a lift system to hoist and deliver 4 ton of bricks per hour at a building site. If the supply is 230V at the basement of the lift with the dumping floor level 65m higher, calculate the following: 1. The percentage volt drop before the load is dumped. NOTE: Take the motor p.f. as 0.9 with a hoist speed of 100r/min through the reduction gearbox when fully loaded. Use a 3 core PVC armoured copper cable of 4 mm square for the entire installation. 2.The resistance of the ECC 3.The touch voltage at the motor if a 5 amp circiut-breaker is used. ANSWERS 2.1 1.50%, 2.2 0.3575 Ohm, 2.3 3.575V
Installation Rules Paper 2 PAPER 2 QUESTION 1 OF NOVEMBER THREE PHASE AC CIRCUITS: PROSPECTIVE SHORT CIRCUIT CURRENT
1. Calculate the PSCC for a three phase fault if the following information is given: *Transformer capacity 200 kVA at 400/250 volt *Transformer protection 200 amp per phase *70 mm2 4 core copper cable + ECC of 100 meters *Z% of the transformer is 5% ohm 2. Calculate the touch voltage at the load if the ECC is the same size as one of the phase conductors 3. What is the total loop impedance for the circuit? ANSWERS: 1. 2.26 kA, 2. 12.748 V, 3. 0.1037418 Ohm Hint For Question 3: Z(Total) = Z(Transformer) + Z(Phase Conductor) + Z(PEN or PE Conductor) Installation Rules Past Exam Papers: Paper 2 Exam Question: THREE PHASE AC CIRCUITS: PROSPECTIVE SHORT CIRCUIT CURRENT 1. Calculate the PSCC for a three phase fault if the following information is given: *Transformer capacity 200 kVA at 400 volts *Transformer protection 200 amp per phase *70 mm2 4 core copper cable + ECC of 100 meters *Z% of the transformer is 5% ohm (8 Marks) 2. Calculate the touch voltage at the load if the ECC is the same size as one of the phase conductors (1 Mark) 3. What is the total loop impedance for the circuit? (1 Mark) Installation Rules Past Exam Papers: Paper 2 Exam Question: Calculate from basic principles the maximum value of the protection device, if the following is given: the length of ECC (earth continuity conductor) is 69 meters of copper with an area of 6mm2. For questions like this, remember two things: The first is that the maximum allowed touch voltage (T.V.) according to the code is 30V. Use this formula: Touch Voltage = 2 x I(CB) x R(ECC) Where, I(CB) is the value of the protective device (Circuit Breaker or Fuse) = the value to be calculated R(ECC) is the resistance value of the Earth Continuity Conductor = we are given the size of the conductor Touch Voltage (T.V) = 30V The second thing: if you can recall from the previous post (voltage drop calculations) that the resistance in Ohms can also be expressed in the following form:
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