NAPIT Guide to Initial Verification & Periodic Testing
Specialist guidance for carrying out electrical inspection and testing with confidence, accuracy and consistency.
The NAPIT Guide to Initial Verification & Periodic Testing has been developed specifically for the needs of electrical inspectors and testers, drawing on the combined knowledge and experience of NAPIT technical experts.
Fully updated to BS 7671:2018+A4:2026 – 18th Edition Wiring Regulations, this comprehensive guide covers the essential processes involved in initial verification and periodic inspection and testing, including the required tests and the production of relevant certificates and reports.
From understanding test instruments and safe isolation procedures to completing standard electrical tests and producing EICRs, the guide brings together the practical and regulatory information inspectors and testers need in one focused publication.
Whether you are verifying a new electrical installation, carrying out periodic inspection of an existing installation or studying towards an inspection and testing qualification, this guide provides practical support through a technically demanding area of electrical work.
What This Guide Covers
- Legal requirements relating to electrical inspection and testing
- BS 7671 requirements for verification and reporting
- Identification of electrical installation components
- Protective earthing and bonding requirements
- Safe isolation procedures
- Selection and use of test instruments
- Use of thermal evaluation equipment
- Standard electrical tests and testing sequences
- Initial verification procedures
- Periodic inspection and testing processes
- Production of relevant certificates and reports, including EICRs
Why Choose This NAPIT Guide?
- Fully updated to BS 7671:2018+A4:2026
- Developed specifically for electrical inspectors and testers
- Provides comprehensive guidance on initial verification and periodic inspection and testing
- Explains different test equipment, its purpose and how required tests are carried out
- Supports accurate production of certificates, reports and EICRs
- Provides practical guidance on safe isolation and testing procedures
- Suitable for anyone undertaking an inspection and testing qualification
- Draws on the combined knowledge and experience of NAPIT technical experts
Who is This Guide For?
The NAPIT Guide to Initial Verification & Periodic Testing is designed for electrical inspectors and testers carrying out verification, inspection and testing of electrical installations.
It is also ideal for anyone taking an inspection and testing qualification, providing guidance on test equipment, testing procedures and the BS 7671 tests required as part of initial verification and periodic inspection.
Contractors and duty holders involved with electrical inspection, testing, certification and reporting can also use the guide as a practical reference.
From Test Equipment to Final Certification
Electrical inspection and testing involves much more than simply taking measurements. Inspectors need to understand the installation, select and use the correct equipment, follow safe procedures, carry out the required tests and accurately record the results.
This NAPIT guide brings those areas together, covering the complete process from safe isolation and test instrument selection through to initial verification, periodic inspection and production of the relevant certificates or reports.
For professionals working in this specialist area, it provides a focused reference designed around the practical needs of inspectors and testers.
Updated for BS 7671:2018+A4:2026
The guide has been fully updated to the 18th Edition Wiring Regulations, BS 7671:2018+A4:2026 and provides guidance on carrying out the required inspection and testing processes in accordance with the Standard.