NAPIT Guide to Initial Verification and Periodic Inspection and Testing, is ideal for anyone taking an inspection and testing qualification; it explains the different test equipment, what they're used for, and how to carry out all of the required BS 7671:2018+A4:2026 tests. 

Fully updated to 18th Edition Wiring Regulations, BS 7671:2018+A24:2026.

For 18th Edition training courses, visit: NAPIT Training

The NAPIT EXPO Roadshow is back for 2026, and this year, we’re hitting the road with a brand-new series of events to cover the impact of the release of the BS 7671:2018+A4:2026 book.

Event Date & Time: 21st April, 8AM - 1PM

Event Location: Utilita Bowl, Botley Rd, Southampton SO30 3XH

Price includes: IET Wiring Regulations 18th Edition A4:2026 Book (which is to be collected at the NAPIT EXPO Southampton, at the NAPIT stand)*, complimentary breakfast rolls and drinks at the event.

The full and comprehensive IET Wiring Regulations 18th Edition A4:2026 On-Site Solutions updated to BS 7671:2018 A4:2026 & NAPIT Guide to Initial Verification and Periodic Inspection and Testing updated to BS 7671:2018+A4:2026

 We have update the guide to assist electricians and renewable contractors with a practical understanding of Solar PV systems including design, selection, installation and commissioning of solar photovoltaic (PV) systems.

The guide provides practical guidance of maintenance and fault finding of Solar PV systems, using a simple approach to finding the faults that may occur and how to rectify them.

The NAPIT EXPO Roadshow is back for 2026, and this year, we’re hitting the road with a brand-new series of events to cover the impact of the release of the BS 7671:2018+A4:2026 book.

Event Date & Time: 8th May, 8AM - 1PM

Event Location: Ashton Gate Football Stadium, Ashton Rd, Bristol BS3 2EJ

Price includes: IET Wiring Regulations 18th Edition A4:2026 Book (which is to be collected at the NAPIT EXPO Bristol, at the NAPIT stand)*, complimentary breakfast rolls and drinks at the event.