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IET Guidance Note 3: Inspection and Testing (BS 7671:2018+A4:2026)

IET
SKU: IETGN39TH
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Key Features
  • Practical inspection and testing guidance aligned with BS 7671:2018+A4:2026
  • Supports correct testing, interpretation and recording of results
  • Updated for modern installations including batteries and prosumers

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Description

IET Guidance Note 3: Inspection and Testing (BS 7671:2018+A4:2026)

Iet Guidance Note 3: Inspection and Testing (BS 7671:2018+14:2026) is a core reference for anyone responsible for the inspection, testing and verification of electrical installation. It provides clear, practical guidance to support safe, compliant work, and it is also widely used by those studying for inspection and testing qualifications.

Fully updated to align with BS 7671:2018+A4:2026, this edition reflects current requirements and good practice for modern installations. It helps users apply consistent methods, interpret results correctly, and record outcomes in a way that supports compliance and ongoing maintenance.

Updates include guidance on identification of conductors, stationary secondary batteries, prosumers’ electrical installations, recommended initial frequencies of inspection, and maximum permissible measured earth fault loop impedance (EFLI) – making it a useful day-to-day book for both working professionals and learners.

Key Features

  • Essential guidance for inspection and testing of electrical installations
  • Useful for practising professionals and those studying inspection and testing qualifications
  • Updated to align with BS 7671:2018+A4:2026
  • Guidance on identification of conductors
  • Includes coverage of stationary secondary batteries
  • Includes guidance for prosumers’ electrical installations
  • Recommended initial frequencies of inspection for electrical installations
  • Maximum permissible measured earth fault loop impedance (EFLI) guidance
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Accessories

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