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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[1]

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.[2]

The current version is BS 7671:2018 (the 18th Edition) issued in 2018 and came into effect from 1 January 2019.[3]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.[4]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

​Birmingham (/ˈbɜːrmɪŋəm/ (About this soundlisten)[3][4] BUR-ming-əm) is a city and metropolitan borough in the West Midlands, England. It is the second-largest city, urban area and metropolitan area in England and the United Kingdom,[b] with roughly 1.1 million inhabitants within the city area, 2.9 million inhabitants within the urban area and 4.3 million inhabitants within the metropolitan area and lies within the most populated English district.[5][6][7][8][9][10][10][11] Birmingham is commonly referred to as the second city of the United Kingdom.[12][13]

Located in the West Midlands county and region in England, approximately 100 miles (160 km) from Central London, Birmingham, as one of the United Kingdom's major cities, is considered to be the social, cultural, financial, and commercial centre of both the East and West Midlands. Distinctively, Birmingham only has small rivers flowing through it, mainly the River Tame and its tributaries River Rea and River Cole – one of the closest main rivers is the Severn, approximately 20 miles (32 km) west of the city centre.

A market town of Warwickshire in the medieval period, Birmingham grew in the 18th-century Midlands Enlightenment and subsequent Industrial Revolution, which saw advances in science, technology, and economic development, producing a series of innovations that laid many of the foundations of modern industrial society.[14] By 1791, it was being hailed as "the first manufacturing town in the world".[15] Birmingham's distinctive economic profile, with thousands of small workshops practising a wide variety of specialised and highly skilled trades, encouraged exceptional levels of creativity and innovation and provided an economic base for prosperity that was to last into the final quarter of the 20th century. The Watt steam engine was invented in Birmingham.[16]

The resulting high level of social mobility also fostered a culture of political radicalism which, under leaders from Thomas Attwood to Joseph Chamberlain, was to give it a political influence unparalleled in Britain outside London, and a pivotal role in the development of British democracy.[17] From the summer of 1940 to the spring of 1943, Birmingham was bombed heavily by the German Luftwaffe in what is known as the Birmingham Blitz. The damage done to the city's infrastructure, in addition to a deliberate policy of demolition and new building by planners, led to extensive urban regeneration in subsequent decades.

Birmingham's economy is now dominated by the service sector.[18] The city is a major international commercial centre and an important transport, retail, events and conference hub. Its metropolitan economy is the second largest in the United Kingdom with a GDP of $121.1bn (2014),[2] and its six universities make it the largest centre of higher education in the country outside London.[19] Birmingham's major cultural institutions – the City of Birmingham Symphony Orchestra, the Birmingham Royal Ballet, the Birmingham Repertory Theatre, the Library of Birmingham and the Barber Institute of Fine Arts – enjoy international reputations,[20] and the city has vibrant and influential grassroots art, music, literary and culinary scenes.[21] The city will host the 2022 Commonwealth Games.[22] Birmingham is the fourth-most visited city in the UK by foreign visitors.[23]