Practical Guide to Inspection Testing and Certification of Electrical Installations pdf-1.pdf
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| Practical Guide to Inspection Testing and Certification of Electrical Installations pdf-1.pdf |
| Introduction |
Inspection and testing of electrical installations
Chapter 1 The legal requirements
| BS 7671 | |
| Building Regulation Part P Section 1. Design, installation, inspection and testing Section 2. Extensions, material alterations and material changes of use | |
| Section 3. Information about other legislation Compliance with Building Regulations Part P | |
| Earthing and bonding to comply with Part P | |
| Registered domestic installer | |
| Unregistered competent person | |
| DIY installer | |
| Summary |
Chapter 2 Types of certifi cation required for the
inspecting and testing of electrical
installations 13
| Certification required for domestic installers (Part P) Minor electrical installation works certificate Part P domestic electrical installation certifi cate Periodic inspection, testing and reporting Certifi cation required for the inspecting and testing of installations other than domestic | |
| 15 | |
| Minor electrical installation works certifi cate Electrical installation certifi cate |
Chapter 3 Initial verification inspection
| Initial verification testing | |
| Sequence of tests | |
| Periodic inspection | |
| Extent and limitations | |
| Visual inspection |
What are we looking for during a periodic
| inspection? Three phase circuits/systems |
Chapter 4 Periodic testing
| Voltage drop in conductors | |
| Testing of electrical installations | |
| Safe isolation | |
| Safe isolation procedure | |
| Testing of protective bonding conductors | |
| Main protective bonding Continuity of protective supplementary bonding conductors Determining if a metal part is extraneous or just a piece of metal | |
| Continuity of circuit protective conductors Method 1 | |
| Method 2 | |
| Ring fi nal circuit test | |
| Broken conductor in a ring circuit | |
| Interconnections | |
| Polarity Insulation resistance test | |
| Low insulation resistance | |
| Testing the whole installation | |
| Testing of individual circuits | |
| Surge protection Insulation resistance testing of a 3 phase installation Polarity test Polarity test on a radial circuit such as a cooker or immersion heater circuit | |
| Polarity test on a lighting circuit | |
| Live polarity |
Chapter 5 Earth electrode testing 105
| Measurement using an earth electrode tester Performing the test | |
| Testing with an earth loop resistance tester Earth fault path for a TT system | |
| Earth fault path for a TN-S system | |
| Earth fault path for a TN-C-S system | |
| Performing a Ze test | |
| Circuit earth fault loop impedance Zs | |
| Verification of Zs values Method using tables from GN3 or the On-site Guide | |
| Direct measurement A circuit incorporating a socket outlet on a ring or a radial Performing the test on a radial circuit other than a socket outlet Earth loop impedance using a high current loop test instrument without tripping an RCD | |
| Prospective fault current test (Ipf) Enquiry | |
| Calculation | |
| Measurement Three wire text | |
| Functional testing | |
| Residual current device | |
| Types of RCD | |
| RCDs and supply systems | |
| Testing of RCDs | |
| Voltage operated (ELCBs) | |
| BS 4293 RCDs | |
| BS EN 610081 | |
| BS 4293 type S | |
| BS EN 61008 type S | |
| BS 7288 RCD protected socket | |
| BS EN 61009 RCBOs |
Chapter 6 Completion of test certificates
| Minor electrical installation works certificate Part 1 Description of minor works | |
| Part 2 Details of the installation | |
| Part 3 Essential tests | |
| Part 4 Declaration | |
| Electrical installation certifi cate | |
| Information required | |
| Next inspection Supply characteristics and earthing arrangements Nature of supply parameters | |
| Frequency Prospective fault current (Ipf) External earth loop impedance (Ze) Supply protective device Particulars of the installation referred to in the certificate | |
| Main protective conductors | |
| Main switch or circuit breaker | |
| Comments on the existing installation |
| Schedules Schedule of test results | |
| Information required | |
| Test results | |
| Schedule of inspections | |
| Description of items to be checked | |
| Basic protection | |
| Fault protection | |
| Prevention of mutual detrimental infl uence Identifi cation | |
| Cables and conductors | |
| General Electrical installation condition report | |
| Completing the form | |
| Summary on the condition of the installation Recommendations | |
| Declaration | |
| Schedules Supply characteristics and earthing arrangements. Particulars of the installation referred to in the certifi cate | |
| Main protective conductors | |
| Main switch/switch fuse/circuit breaker Observations Condition report inspection schedule |
Chapter 7 Correct selection of protective devices
| Why are they installed? What type of device is it? Is it a fuse or circuit breaker? Is the device being used for protection against indirect contact? What type of circuit is the device protecting, is it supplying fixed equipment only, or could it supply hand held equipment? If it is a circuit breaker is it the correct type? Will the device be able to safely interrupt the prospective fault current which could fl ow in the event of a fault? Is the device correctly coordinated with the load and the cable? | |
| Additional information regarding circuit breakers Overload current Maximum earth fault loop impedance values (Zs) for circuit breakers | |
| 188 |
Calculation of the maximum Z
| breakers Comparing maximum Zs and measured Zs | |
| Testing transformers | |
| Step up or down double wound transformer | |
| Isolation transformer Separated extra low voltage transformers (SELV and PELV) | |
| Testing a 3 phase motor |
Chapter 8 Test equipment 195
| Instruments required | |
| Low resistance ohm meter | |
| Insulation resistance tester | |
| Earth fault loop impedance tester Prospective short circuit current test instrument Earth electrode resistance tester | |
| Residual current device tester | |
| Phase rotation | |
| Thermographic equipment | |
| Calibration of test instruments | |
| Volt stick |
Chapter 9 Electric shock 201
Ingress protection 203
Chapter 10 Testing photovoltaic systems
| Testing and commissioning | |
| Visual inspection | |
| Testing the d.c. side of the installation | |
| Insulation resistance test | |
| Testing the a.c. side of the installation |
| Chapter 11 Exercises and questions | |
| Chapter 12 Answers | |
| Glossary | |
| Index |
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