Safe Isolation & GS38 (Closed Book)
Essential closed-book memory recall of safe isolation steps, GS38 probe tip dimensions, and safety laws.
Key Learning & Examination Objectives
- ✓ GS38 maximum exposed tip length (4mm or 2mm fused)
- ✓ Sequence of proving dead with an approved indicator
- ✓ EAWR Regulation 14 non-negotiable rules
Overview of Closed: Safe Isolation
The Safe Isolation & GS38 (Closed Book) module evaluates your practical understanding of BS 7671:2018+A4:2026 Part 6 (Inspection and Testing) and IET Guidance Note 3. Candidates preparing for the City & Guilds 2391-52 qualification must demonstrate complete accuracy in both theoretical principles and field test execution.
Important BS 7671 Standard Note
All questions in this module strictly reflect the latest UK wiring regulations BS 7671:2018+A4:2026. Pay special attention to maximum earth fault loop impedance tables, temperature correction factors (0.8 × Zs rule), and RCD trip testing thresholds.
Question Bank Details
Our full mobile app contains 21 practice questions for this topic alone. You can test your knowledge right now using our web quiz player.