British StandardBS 7671"Requirements for Electrical Installations. IET Wiring Regulations", informally called in the electrical communityThe "Regs", is the national standard in theUnited Kingdomfor electrical installation and the safety ofelectrical wiringin domestic, commercial, industrial, and other buildings, also in special installations and locations, such as marinas or caravan parks and medical locations
In general, BS 7671 applies to circuits supplied at nominal voltages (Uo) up to and including 1000 volts AC or 1500 volts DC. The standard therefore covers the Extra Low Voltage (ELV) range (0-50V AC, 0-125V DC), and the Low Voltage (LV) range (50-1000V AC, 125-1500V DC). The frequencies covered for AC are 50 Hz, 60 Hz, and 400 Hz, used in the UK for houses, offices, and commerce. It did not become a recognizedBritish Standarduntil the publication of the 16th edition in 1992. The standard takes account of the technical substance of agreements reached inCENELEC.
The current version is BS 7671:2018 (the 18th Edition) issued in 2018 and came into effect from 1 January 2019.Amendment 1 to the 18th Edition was published in February 2020 but the only changes were to section 722 (Electric Vehicle Charging Installations). These changes came into immediate effect upon publication release, unlike previous amendments where 6 months elapsed before changes became compliant.BS 7671 is also used as a national standard byMauritius,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
Worcester (/ˈwʊstər/ (About this soundlisten) WUUS-tər) is a cathedral city in Worcestershire, England, 30 miles (48 km) south-west of Birmingham, 101 miles (163 km) west-north-west of London, 27 miles (43 km) north of Gloucester and 23 miles (37 km) north-east of Hereford. The population is about 100,000. The River Severn flanks the western side of the city centre, which is overlooked by Worcester Cathedral. The Battle of Worcester in 1651 was the final one in the English Civil War, where Oliver Cromwell's New Model Army defeated King Charles I's Royalists. Worcester is the home of Royal Worcester Porcelain, composer Edward Elgar, Lea & Perrins, makers of traditional Worcestershire sauce, University of Worcester, and Berrow's Worcester Journal, claimed as the world's oldest newspaper.