BS 7671
British Standard BS 7671 "Requirements for Electrical Installations. IET Wiring Regulations", informally called in the UK electrical community "The Regs", is the national standard in the United Kingdom for electrical installation and the safety of electrical wiring in domestic, commercial, industrial, and other buildings, also in special installations and locations, such as marinas or caravan parks and medical locations
| Electrical installations |
|---|
| Wiring practice by region or country |
| Regulation of electrical installations |
| Cabling and accessories |
| Switching and protection devices |
In general, BS 7671 applies to circuits supplied at nominal voltages (U0) up to and including 1000 volts AC or 1500 volts DC. The standard therefore covers the Extra Low Voltage (ELV) range (0-50V AC, 0-120V DC), and the Low Voltage (LV) range (50-1000V AC, 120-1500V DC). The frequencies covered for AC are 50 Hz, used widely in the UK for the public supply to dwellings, offices, and commerce, along with 60 Hz, and 400 Hz found in certain commercial and industrial applications. It did not become a recognized British Standard until after the publication of the 16th edition in 1992. The standard takes account of the technical substance of agreements reached in CENELEC.
The current version is BS 7671:2018+A2:2022 (the 18th Edition) issued in 2022, and came into effect from 28 March 2022 (the previous version BS 7671:2018+A1:2020 being withdrawn on 27 September 2022). BS 7671 is also used as a national standard by Mauritius, St Lucia, Saint Vincent and the Grenadines, Sierra Leone, Singapore, Sri Lanka, Trinidad and Tobago, Uganda, Cyprus, and several other countries, which base their wiring regulations on BS 7671.