Electrical inspection, testing and certification : a guide to passing the City and Guilds 2391 exams

✍ Scribed by (Electrician) Michael Drury

• Year: 2019
• Tongue: English
• Leaves: 183
• Edition: Third
• Category: Library

✦ Table of Contents

Cover
Half Title
Title Page
Copyright Page
Table of contents
Introduction
1. Statutory and non-statutory regulations
1.1 Legal responsibilities
1.2 The memorandum of guidance on the electricity at work
regulations 1989
1.3 BS 7671 wiring regulations
1.4 Inspector’s status: differentiating between the terms in law
and legal
1.5 IET guidance note 3 inspection & testing
2. Certification and reports
2.1 Documentation
2.2 Electrical installation certificate (EIC)
2.3 Schedule of inspection
2.4 Minor electrical installation works certificate (minor works
certificate)
2.5 Electrical installation condition report (EICR)
2.6 Condition report inspection schedule (for domestic and
similar premises with up to 100A supply)
2.7 Schedule of test results
3. Electrical safety
3.1 Regulation 12 – means for cutting off the supply and for
isolation
3.2 Regulation 13 – precaution for work on equipment made dead
3.3 Regulation 14 – work on or near live conductors
3.4 Isolation procedure
3.5 Terminology: electrical charge and live
3.6 HSE GS 38: electrical test equipment for use on low voltage
electrical systems
4. Installation Testing
4.1 Initial verification
4.2 Sequence of tests
4.3 Test sequence
4.4 Instrument check
4.5 Safe isolation
4.6 Test 1 i): Continuity of protective conductors
4.7 Continuity of protective conductor: testing methods
4.8 Test 1 ii): Continuity of ring final circuit conductors
4.9 Spurious results
4.10 Test 2: Insulation resistance
4.11 Testing preliminaries
4.12 Test results
4.13 Test 3 i): Confirming SELV or PELV circuits by insulation testing
4.14 Testing procedure
4.15 Test 3 ii): Electrical separation
4.16 Test 4: Insulation resistance/impedance of floors and walls
4.17 Test 5: Polarity testing
4.18 Test 6: Protection by automatic disconnection of supply (ADS)
4.19 Test 7: Earth electrode resistance
4.20 Test 8: Earth fault loop impedance verification
4.21 Measurement of earth fault loop impedance (Zs)
4.22 Measurement of external earth fault loop impedance (Ze)
4.23 Test 9: Prospective fault current (Ipf)
4.24 Reasons for measuring PSCC and PEFC
4.25 Breaking capacities
4.26 Test 10: Additional protection
4.27 Test 11: Phase sequence
4.28 Test 12: Functional testing
4.29 Test 13: Verification of voltage drop
4.30 Verification in medical locations
4.31 Temporary overvoltages due to high voltage systems
4.32 Verification of protection against overvoltages of atmospheric
origin or due to switching
4.33 Selection and erection of surge protective devices
4.34 Verification of measures against electromagnetic disturbance
5. Initial verification
5.1 The purpose of the initial verification
5.2 Departures from BS 7671
5.3 Foremost inspection
5.4 Inspection of installed equipment
5.5 Inspector’s responsibilities
5.6 Required information
6. Periodic inspection
6.1 Purpose of periodic inspection and testing
6.2 Necessity for Periodic inspection and testing
6.3 Required information
6.4 What action should be taken where diagrams, charts or tables
are not available?
6.5 What is a survey?
6.6 Sampling
6.7 Setting the sample size
6.8 Results of sampled inspection and testing
6.9 Frequency of periodic inspections
6.10 Competence
7. Initial verification and periodic inspection questions
8. Further questions
9. Equations and calculations
9.1 Cable resistance
9.2 Voltage drop
9.3 Earth fault loop impedance
9.4 Insulation resistance
9.5 Insulation resistivity
9.6 RCD used fault protection
10. C&G 2391-50, 51 and 52 syllabi
Glossary of terms
Index