NAPIT
EICR Codebreakers Book

NAPIT EICR Codebreakers BS 7671 A4:2026

Confident EICR coding starts with clear, reliable guidance.

The NAPIT EICR Codebreakers book has been fully updated to align with BS 7671:2018+A4:2026 – 18th Edition Amendment 4 of the IET Wiring Regulations, providing contractors, inspectors and clients with purpose-written guidance on correctly coding observations during Electrical Installation Condition Reports.

For anyone carrying out EICR inspections, accurate classification matters. This updated edition helps support consistent, compliant and defensible coding decisions while guiding users through what can be a highly technical area of electrical inspection and reporting.

Existing observation codes have been updated for Amendment 4, previous amendments have been incorporated, and the technical guidance has been expanded to provide additional support for contractors, inspectors, clients and duty holders.

Whether working across domestic, commercial or industrial inspections, NAPIT EICR Codebreakers provides a focused technical reference for applying the latest requirements of BS 7671 when assessing and recording observations.

Why Choose NAPIT EICR Codebreakers?

• Fully updated to BS 7671:2018+A4:2026
• Supports accurate C1, C2, C3 and FI coding decisions
• Helps contractors and inspectors apply the latest 18th Edition Wiring Regulations
• Provides purpose-written guidance for contractors, inspectors and clients
• Helps reduce the risk of incorrect classification during EICR inspections
• Includes expanded technical guidance for contractors and inspectors
• Provides clear support for clients and duty holders
• Includes enhanced guidance designed to reduce coding errors and compliance risks
• Suitable for domestic, commercial and industrial inspections

Fully Updated for Amendment 4 (2026)

This latest edition has been updated to reflect BS 7671:2018+A4:2026, bringing the EICR coding guidance into line with Amendment 4 of the 18th Edition Wiring Regulations.

• Existing EICR observation codes updated to BS 7671:2018+A4:2026
• Previous amendments incorporated into the updated guidance
• Expanded technical information for contractors and inspectors
• Additional guidance for clients and duty holders
• New sections providing specific advice for clients and inspectors
• Guidance relating to risk assessments

New Inclusions Under BS 7671:2018+A4:2026

The updated edition reflects important additions within BS 7671:2018+A4:2026, including:

• Stationary Secondary Batteries where the purpose is electrical energy storage and supply of electrical installations
• Functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems
• Inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors

Who is NAPIT EICR Codebreakers For?

NAPIT EICR Codebreakers is purpose-written to support electrical contractors, inspectors and clients involved with Electrical Installation Condition Reports.

It is particularly valuable for those carrying out EICR inspections who need practical guidance when making and recording observation coding decisions under BS 7671:2018+A4:2026.

The publication can be used across domestic, commercial and industrial inspections, providing guidance through the technical considerations involved in EICR observation coding.

A Practical Reference for EICR Coding

Correctly coding observations is a critical part of the EICR process. NAPIT EICR Codebreakers focuses specifically on this area, helping inspectors navigate coding decisions with clearer guidance aligned to the latest Wiring Regulations.

With updated codes, expanded technical information and additional guidance for inspectors, contractors, clients and duty holders, this edition provides a dedicated reference for professionals looking to maintain consistent EICR inspection and reporting practices under Amendment 4.

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