Guidance Note 1 Amendment 4
The guidance note 1 amendment 4 is the fully updated 10th Edition of the IET’s essential Selection & Erection publication, aligned with BS 7671:2018+A4:2026.
This fundamental guide supports specifiers, installers and professionals responsible for inspection and testing, providing clear explanation on how to correctly apply the relevant sections of BS 7671 in practical installations.
Key Amendment 4 Updates Include:
- Notices and identification labels required by BS 7671
- Bidirectional and unidirectional protective devices
- Insulation Monitoring Devices (IMDs)
- Co-ordination between RCD types connected in series
- Guidance for protected escape routes
- Conductor classes
- Updated requirements for cables concealed in walls or partitions
- Functional earthing and equipotential bonding for ICT systems
- Stationary Secondary Batteries
- Rating of distribution boards with multiple sources (with examples)
- Power over Ethernet (PoE)
Structured for practical use, the guidance note 1 amendment 4 is ideal for ensuring installations are compliant, safe and correctly specified under the latest Wiring Regulations.
Product Details
- Publication Year: 2026
- Pages: 246
- ISBN-13: 978-1-83724-042-5
- Format: Paperback (PBK)
- Subject: Electrical Regulations
An essential reference for electricians, designers and consultants working to the latest BS 7671 Amendment 4 requirements.
