BS 7671:2018+A4:2026
Quick Reference Guide
Essential page references and exam breakdown for electricians, trainees, inspectors and electrical installation professionals using BS 7671.
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BS7671:2018+A4:2026 Quick Reference Guide
the-Regs.co.uk
22Part 1: Scope, Object & Fundamental Principles
25Fundamental Principles Chapter 13
32Part 2: Definitions
52Symbols Used
56Part 3: Assessment of General Characteristics
60TN-C-S (PME) Figure 3.9A
61TN-C-S (PNB) 'NEW' Figure 3.9B
65Safety Services Sources 351.1
66Part 4: Protection for Safety
70Automatic Disconnection of Supply 411
71Maximum Disconnection Times 411.3.2.2
72Additional Protection – Outdoor Sockets 411.3.3
75Maximum Zs for CBs & RCBOs Table 41.3
81Maximum Zs 110V at 5 Seconds Table 41.6
85Sources for SELV & PELV 414.3
86Additional Protection – RCDs 415.1
87Barriers or Enclosures (IP2X, IP4X) 416.2
93Domestic Consumer Units 421.1.201
103Socket Rings 433.1.204
116Rated Impulse Voltages of Equipment 443.6.2
134Isolation 462
136Part 5: Selection & Erection of Equipment
144Periodic Inspection & Testing Notice 514.12.1
152Cables in Walls < 50mm 'NEW TABLE' Table 52.1
157Voltage Drop 525
159Fire Sealing of Penetrations 527.2
167RCD Selection – TT Systems Table 53.1
169AFDDs 532.6
173SPD Types & Locations 534.4.1
197Fire Fighter’s Switch 537.4
207Supply Earthing Arrangements 542.1.2
208Buried Earth Conductor Table 54.1
209Protective Conductor CSA Calculation 543.1.3
211Protective Conductor CSA Table 54.7
215Bonding Conductor Sizes 544.1.1
216Functional Earthing & Bonding 'NEW' 545
235Lighting Symbols Table 55.3
241Stationary Secondary Batteries 'NEW' Chapter 57
245Part 6: Inspection & Testing
249Minimum Insulation Resistance Table 64
256Part 7: Special Installations or Locations
257Bathrooms 701
262Swimming Pools & Fountains 702
271Saunas 703
273Construction & Demolition Sites 704
276Agriculture & Horticultural 705
282Restrictive Movement 706
283Caravan & Camping Parks 708
287Marinas 709
294Medical Locations 710
311Exhibitions, Shows & Stands 711
314Solar Photovoltaic (PV) 712
325Outdoor Lighting Installations 714
327ELV Lighting 715
330Power over Ethernet 'NEW' 716
332Mobile or Transportable Units 717
340Caravans & Motor Caravans 721
350Electric Vehicle Charge Points 722
356Maintenance Gangways 729
361Onshore Unit Connections 730
366Temporary Installations / Fairgrounds 740
371Embedded Heating Systems 753
375Part 8: Functional Requirements
380Types of PEI 824
387Energy Management Systems (EEMS) 825
410Appendices
438Measured Zs – 80% Rule Appendix 3
445Time/Current Type B 60898 & 61009 Fig 3A4
458Voltage Drop Max Table 4Ab
484PVC Twin & Earth Table (Current and VD) Table 4D5
536Model Forms / Certificates Appendix 6
583Rings & Radial Sockets Appendix 15
592Table of Figures
596Table of Tables
City & Guilds exam prep
BS 7671 exam breakdown
| Section | Question No | Total | Exam % |
|---|---|---|---|
| Part 1 | 1–4 | 4 | 7% |
| Part 2 | 5–6 | 2 | 3% |
| Part 3 | 7–12 | 6 | 10% |
| Part 4 | 13–27 | 15 | 25% |
| Part 5 | 28–41 | 14 | 23% |
| Part 6 | 42–45 | 4 | 7% |
| Part 7 | 46–52 | 7 | 12% |
| Part 8 & Appendices | 53–60 | 8 | 13% |