BS 7430:1998 - Code of practice for earthing – BSI British Standards
Maintenance will be taking place for BSI Shop on Saturday 19th September 2020 between 08:00 AM and 14:00 PM UK time. During this period, BSI Shop will have limited functionality. Please do not make any purchases during these works. Please accept our apologies for any inconvenience caused during this essential maintenance.

BS 7430:1998

Code of practice for earthing

Status : Revised, Superseded, Withdrawn   Published : November 1998 Replaced By : BS 7430:2011+A1:2015

*To ask about withdrawn titles contact the
Customer Relations, +44 345 086 9001

Code of practice for earthing

Executive summary

Guidance on the methods for earthing electrical systems.


This British Standard gives guidance on the methods that may be adopted to earth an electrical system for the purpose of limiting the potential (with respect to the general mass of the earth) of current-carrying conductors forming part of the system, and non-current-carrying metalwork associated with equipment, apparatus, and appliances connected to the system.

This standard applies only to land-based installations; it does not apply to ships, aircraft or offshore installations, nor does it deal with the earthing of medical equipment or the special problems encountered with solid state electronic components and equipment due to their sensitivity to static electricity.

This standard does not address electromagnetic compatibility requirements for earthing, nor does it give recommendations for functional earthing.

History and related standards

This British Standard supersedes BS 7430:1991 which is withdrawn.

It includes the following cross references:

BS 729, BS 951, BS 3019-1, BS 3288-1, BS 3535, BS 3571, BS 4293, BS 4727,

BS 5345, BS 6651, BS 7375, BS 7671:1992, BS EN 10025.

Standard NumberBS 7430:1998
TitleCode of practice for earthing
StatusRevised, Superseded, Withdrawn
Publication Date15 November 1998
Withdrawn Date31 December 2011
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Replaced ByBS 7430:2011+A1:2015
ReplacesBS 7430:1991
Draft Superseded By84/21243 DC
DescriptorsElectrical equipment, Electrical protection equipment, Earthing, Electrical safety, Earth electrodes, Legislation, Electric power systems, Classification systems, Electric power networks, Overhead power lines, Electric generators, Low voltage, Electric power stations, Electric substations, Electrical resistance, Soils, Electrical resistivity, Equations, Shape, Selection, Performance, Metals, Grades (quality), Designations, Electrical properties of materials, Corrosion resistance, Corrosion protection, Inspection, Performance testing, Electrical measurement, Resistance measurement, Circuit diagrams, High-voltage equipment, Design, Electric conductors, Electric cables, Cathodic protection, Electric discharges, Lightning protection, Domestic electrical installations, Industrial, Electrical impedance, Scaffolds, Caravans, Mobile, Mining, Fences, Lighting systems, Street furniture, Maritime structures, Occupational safety, Explosive atmospheres, Railway electric traction equipment, Railway equipment, Alternating current, Direct current, Tramway systems, Mathematical calculations Railway applications
Title in FrenchCode de pratique pour mise a la terre
Title in GermanErdung elektrischer Systeme
ISBN0 580 28229 5
File Size2.125 MB

*To ask about withdrawn titles contact the
Customer Relations, +44 345 086 9001
 Your basket
Your basket is empty

Multi-user access to over 3,500 medical device standards, regulations, expert commentaries and other documents

Worldwide Standards
We can source any standard from anywhere in the world

Develop a PAS

Develop a fast-track standardization document in 9-12 months

Tracked Changes

Understand the changes made to a standard with our new Tracked Changes version

Customers who bought this product also bought

  • BS 5266-1:2005
    Emergency lighting Code of practice for the emergency lighting of premises
  • BS 7375:2010
    Distribution of electricity on construction and demolition sites. Code of practice
  • BS EN 1679-1:1998+A1:2011
    Reciprocating internal combustion engines. Safety Compression ignition engines
  • BS EN 12336:2005+A1:2008
    Tunnelling machines. Shield machines, thrust boring machines, auger boring machines, lining erection equipment. Safety requirements