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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

​Staffordshire (/ˈstæfərdˌʃɪər, -ʃər/;[2] postal abbreviation Staffs.) is a landlocked county in the West Midlands of England. It borders Cheshire to the northwest, Derbyshire and Leicestershire to the east, Warwickshire to the southeast, West Midlands and Worcestershire to the south, and Shropshire to the west.

The largest settlement in Staffordshire is Stoke-on-Trent, which is administered as an independent unitary authority, separately from the rest of the county. Lichfield, a smaller settlement, is a cathedral city. Other major settlements include Stafford, Burton upon Trent, Cannock, Newcastle-under-Lyme, Rugeley, Leek, and Tamworth.

Smaller towns include Stone, Cheadle, Uttoxeter, Burntwood/Chasetown, Eccleshall, Biddulph, Penkridge and the large villages of Wombourne, Kinver, Tutbury, Alrewas, Barton-under-Needwood, Stretton and Abbots Bromley. Cannock Chase AONB is within the county as well as parts of the National Forest and the Peak District national park.

Wolverhampton, Walsall, West Bromwich and Smethwick are within the historic county boundaries of Staffordshire, but since 1974 have been part of the West Midlands county.

Apart from Stoke-on-Trent, Staffordshire is divided into the districts of Cannock Chase, East Staffordshire, Lichfield, Newcastle-under-Lyme, South Staffordshire, Stafford, Staffordshire Moorlands, and Tamworth.

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