BS 7430:2011+A1:2015 Code of practice for protective earthing of electrical installations

BS 7430:2011+A1:2015

Code of practice for protective earthing of electrical installations

Status : Confirmed, Current   Published : December 2011



What is this standard about?

This is a 2015 amendment to a 2011 British Standard on how to meet UK electrical installation earthing requirements.

Who is this standard for?

The standard is relevant in the following sectors: transport, aerospace, auto, railway, built environment, education and training, finance, healthcare, ICT, industrial (engineering services, electrical equipment, chemical, materials, food and agriculture, mechanical equipment, R&D, testing, textiles), services, oil/gas/energy.

It is of particular relevance to:

  • Electricians and electrical engineers
  • Engineering service providers
  • Designers, specifiers, installers and maintainers of earthing and lightning protection equipment
  • Built environment specialists (architectural and surveying services, building contractors, construction products providers)
  • Librarians at colleges and technical institutes
  • Councils and housing associations
  • ICT service providers
  • Electrical/electronic appliance manufacturers

Why should you use this standard?

Effective earthing safeguards people from the risk of electric shock. To design, specify, inspect and periodically test and maintain earthing systems without endangering those who come into contact with them, users need to follow the guidelines and recommendations outlined in this standard.

It covers earthing system design parameters for structures, electrical equipment and systems.

It also defines selection parameters for the earthing arrangements and makes clear the need for careful consideration of various site conditions such as soil composition and resistivity.

What’s changed since the last update?

Since BS 7430 was last revised in 2011 a number of queries, errors and inaccuracies were brought to BSI’s attention by users. This amendment tackles these issues and provides clarification on a number of points in the standard in order to eliminate any ambiguity. It includes a number of editorial changes which clarify the meaning of the text and corrects values and symbols. It also includes some technical changes to correct and clarify formulae and equations.

Standard NumberBS 7430:2011+A1:2015
TitleCode of practice for protective earthing of electrical installations
StatusConfirmed, Current
Publication Date31 December 2011
Confirm Date30 October 2020
Normative References(Required to achieve compliance to this standard)BS 1562:1997, BS 2871-1:1971, IEC 61557, BS 7375, BS 2873:1969, BS EN 1011-4, IEC 60050-604, IEC 60309, BS EN 62035-4, ER S36-1, BS 3288-1, BS 215-2:1970, BS EN 62305-2, BS IEC 60050-195, BS 2871-2:1972, BS EN 60309, BS EN 50522:2011, BS 1449:1991, BS EN 10263-4:2001, BS EN 1780-1:2002, BS EN 12163:2011, BS EN 10025-2:2004, BS EN 12165:2011, BS 2874:1986, BS EN 12167:2011, BS EN 50122-1, BS EN 50122-2, BS EN 61936-1:2010+A1:2014, ER G83, BS EN 10088-1:2005, BS EN 13601:2002, BS EN 1652:1998, BS EN 485-2:2008, BS EN 1982:2008, PD 970:2005, BS EN 12420:1999, BS EN 60228:2005, BS EN 12449:1999, BS 7671:2008+A3:2015, BS EN 586-2:1994, BS 1377-3:2018, IEC Guide 104, BS EN 755-2:2008, BS EN 61557, BS 1561:1997, BS 1400, ER G84, BS 951, BS 729, BS EN 62305-3, BS 2871-3:1972, ISO/IEC Guide 51, BS EN 61140, ER G59, BS EN 61010, BS 1473:1972, BS 1474:1987
Informative References(Provided for Information)BS EN 14505, BS EN 61140, BS 7454, BS EN ISO 1460, IEC 60909, Electricity Safety, Quality & Continuity Regulations (Northern Ireland) 2012, BS EN 88528-11, BS EN 60601, The Electricity at Work Regulations 1989, PD 6484, BS EN 62040-1-2, BS EN 50173, Electricity Safety, Quality and Continuity Regulations 2002, IEC 61140
ReplacesBS 7430:1998
Amended ByAmendment, August 2015; Corrigendum, May 2012
Draft Superseded By15/30322343 DC
DescriptorsEarthing, Electrical equipment, Domestic electrical installations, Classification systems, Explosive atmospheres, Railway electric traction equipment, Tramway systems, Maritime structures, Resistance measurement, Alternating current, Design, Performance, Electric conductors, Overhead power lines, Fences, Cathodic protection, Corrosion protection, Lighting systems, Metals, Equations, Low voltage, Grades (quality), Soils, Electrical safety, Corrosion resistance, Designations, Electric power stations, Shape, Earth electrodes, Railway equipment, Electric discharges, Electric generators, Selection, Industrial, Electrical protection equipment, Electric power networks, Circuit diagrams, Mathematical calculations, Electric substations, Electric power systems, Caravans, Occupational safety, High-voltage equipment, Mining, Electrical impedance, Electrical resistivity, Inspection, Electric cables, Mobile, Electrical properties of materials, Scaffolds, Direct current, Electrical resistance, Street furniture, Electrical measurement, Lightning protection, Performance testing, Legislation
ISBN978 0 580 90007 5
File Size1.073 MB

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