INSTALLATION RULES PAPER 2 STUDY GUIDE

Transcription

1 INSTALLATION RULES PAPER 2 STUDY GUIDE Compiled By: Leonard Fikani Ndlovu info@installationrulesstudymate.co.za Website:

2 INSTALLATION RULES PAPER 2 STUDY GUIDE Leornard Fikani Ndlovu PO Box 4367 Durban 4000 Kwazulu Natal Province South Africa E mail: info@installationrulesstudymate.co.za Website: By Leornard FikaniNdlovu Ndlovu, Author All rights reserved. No part of this Study Guide may be reproduced or transmitted in any form or by any means without written permission from the Author.

3 TABLE OF CONTENTS Page No. Introduction 11 Syllabus 12 Important Tables 13 Important Formulas 14 Resistance Touch Voltage Voltage Drop Neutral Current Load Moment AC PSCC DC PSCC Power Example 1 24 General Knowledge Example 2 27 Calculating The Volt Drop Of A Cable Sixth Method Seventh Method Example 3 34 Determine The Minimum Main Cable Size

4 Page No. Determine The Actual % Volt Drop Determine The Main Protection Tripping Rating Determine The Current Unbalanced Factor Determine The Resistance Of The ECC Example 4 47 SIX Different Methods To Determine Volt Drop Determine Using Monogram Model The Specific Resistance Specific Resistance Of Copper Specific Resistance Of Aluminum Practical Example Of How The Monogram Is Used In Volt Drop Calculations Example 5 55 Calculate The Three Phase Prospective Fault Current Calculate The Phase To Phase Prospective Fault Current Calculate The Volt Drop At The Load Calculate The Minimum ECC Size Calculate The Touch Voltage Example 6 68 Determine The Minimum Cable Size

5 Calculate The Volt Drop DB To A Calculate The Volt Drop DB To B Page No. Calculate The % Volt Drop Worst Case Determine The Main Protection Level Determine The Specific Value Of Copper Cable Used Example 7 91 Calculate The Connected Load Determine The Minimum Cable Size From DB To Load

6 Determine The Minimum Main Cable Size Calculate The % Volt Drop At The Load Page No. Give The Maximum Allowable Touch Voltage According To The Code Example Calculate The Maximum Volt Drop DB To Circuit A Test Your Answer By making Use Of Table E.1 Methods 2 To 5 Calculate The Maximum Volt Drop DB To Circuit B First Mthd Method Calculate The Minimum Copper Cable Size For A 3 Phase Motor Is Your Cable Size Suitable (Correct) Explain? Example Determine The Total Volt Drop Of The Supply Calculate The Total Resistance Of The Supply Cable

7 Page No. Test The Total Volt Drop Of The Supply Using Any Other Method By Making Use Of TABLE E.1 Only, Calculate The Length Of ECC Example Calculate The % Volt Drop Of A Single Phase Motor Sixth Method Determine The Resistance Of The ECC First Mthd Method Calculate The Touch Voltage At The Motor Example Calculate The PSCC For A Three Phase Fault Calculate The Touch Voltage At The Load Determine The Total Loop Impedance Example Calculate The PSCC For A Three Phase Fault Calculate The Touch Voltage At The Load Determine The Total Loop Impedance

8 Page No. Example Calculate The PSCC Of A DC Supply Example Calculate The PSCC Of A DC Supply Example Determine How Many PVC Conductors May Be Added To The Given Conduit Example Determine How Many PVC Conductors May Be Added To The Given Conduit Example Determine The Conduit Size For The Given Installation Example Derive From Basic Principles The Approximate Resistance Value Exercise 172 Derive From Basic Principles The Approximate Resistance Value Example Calculate The Maximum Value Of The Protection Device Calculate Maximum Value Of The Protection Device Calculate The Maximum Length Of The ECC Determine The Actual Resistance Value For The Above Length Calculate The Actual Length Of The ECC Determine The Actual Touch Voltage For This Conductor Calculate The Aerial Area Of The ECC

9 Application Of Table 6.28 Calculate The Minimum Size Of The ECC Page No. Example Loop Impedance Test And PSCC Test Example Earth Electrode Test Accuracy And Resolution Verification Of Test Instrument Example Insulation Resistance Test Verification Of Test Instruments Example How The Touch Voltage Is Determined Module Module Module Module Module Module 6 207

10 Page No. Module Module Module Module Module Important Annexures 221 Paper 2 Checklist 222 Module 6 Answers 224

11 WELCOME We would like to welcome you to the Installation Rules Paper 2 Study Guide and we thank you for investing in our study material. If you have never taken this Exam or have attempted it before, this Study Guide together with the accompanying Software will give you some idea of what to expect the actual Exam session to be like and to sharpen your skills on how to answer such Exam questions. Our Study Tools are designed to facilitate your Exam preparation process and to shorten your preparation time. The main objective of our Study Tools is to give you the knowledge, practice and confidence necessary to pass the Exams with flying colours on the first try. This objective is achieved by providing excellent Study Tools packed with detailed, step by step examples and many Exam Style Questions. The Installation Rules Study Tools ensures that your understanding of the material covered in the Regulation Standards is solidified and also ensures that all the objectives and aims of the Installation Rules Course are satisfied keep in mind that for the Installation Rules Exams you are required to demonstrate sufficient knowledge, understanding and application of the regulation standards. The latest standards (Books) that will be required for the Installation Rules Paper 2 are: SANS and SANS The information provided in this guide is divided into two sections: Section 1 gives you worked out examples of calculations and some theory questions for Paper Two. Most of the examples are taken from Past Exam Papers. Section 2 is divided into Modules 1 to 11 make sure to answer ALL the questions in these Modules. For ease of use each question in the Modules have Page numbers next to them indicating where you can get the answer to that particular question in the Regulation Book. We have included answers to Module 6, and for answers to calculation questions please refer to Examples. First, work with the Study Guide and for revision and practice run the Exam Simulator. We have also included 10 Revision Questions in a separate file as well, you may use this as the final preparation for your Exam. We wish you all the best. Installation Rules Study Mate Team Page 11

12 INSTALLATION RULES PAPER 2 SYLLABUS SANS LATEST EDITION: The Wiring Of Premises Part 1 [LV Installations] Section 6: Section 8: Annexure B: Annexure C: Annexure E: Annexure G: Annexure K: Annexure L: Annexure N: Annexure 0: Installation Requirements Verification And Certification Limits of arm s reach Installation Components Calculation Of Voltage Drop Conductors In Conduits Notification Of A Potential Danger Installations Of Surge Protection Devices (SPDs) Into Low Voltage Systems Earthing Arrangements And Equipotential Bonding Of IT Installations For Functional Purposes Classification Of Safety Services Necessary For Medical Locations SANS 1973 LATEST EDITION: Low Voltage Switch Gear, Control Gear Assemblies Safety Of Assemblies With A Rated Prospective Short Circuit Current Of Up To & Including 10 ka Page 12

13 IMPORTANT TABLES FOR PAPER 2 You have to be able to apply the following Tables in solving many of paper 2 calculations: Page Tbl Table 63(b) Table 6.4 (b) 107 Table Table Table Table Table Table Table Table E Table E Page 13