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IET Guidance Note 8 Earthing and Bonding 4th Edition 2019 (PDF)

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About the book

4th Edition 2019 (incorporating BS 7671:2018)
Pages: 213
Publisher: IET
Language: English;
Size: 124 Mb;

This Guidance Note is part of a series issued by the Institution of Engineering and Technology to enlarge upon and simplify some of the requirements in BS 7671 2018, the 18th Edition of the Wiring Regulations.

This Guidance Note is principally concerned with the electrical installation aspects of earthing, protective bonding and the principal protective measure of fault protection against electric shock (automatic disconnection of supply). lt draws from the requirements embodied in the relevant parts, chapters and sections of BS 7671.


Cooperating organizations
Chapter 1 Protective earthing
Protective earthing
Source earthing
The purpose of source earthing
The purpose of electrical equipment earthing
Chapter 2 The means of earthing
The means of earthing
Distributors' facilities
Earth electrodes
Rod electrodes
Tape and wire electrodes
Plate electrodes
Structural metalwork electrodes
Lead sheaths and other metal coverings of cables for electrodes
Location of the installation earth electrode
Resistance of the earth electrode
Calculating the resistance of a rod electrode
Calculating the resistance of a plate electrode
Calculating the resistance of a tape electrode
Limiting values of the electrode resistance for TT systems
Electrode installation
Electrode loading capacity
Earth electrode resistance testing
Determination of the external earth fault loop impedance, Ze
Responsibility for providing a means of earthing
Chapter 3 The earthing conductor
The earthing conductor
The cross-sectional area of an earthing conductor
The csa of a buried earthing conductor
Minimum csa of an earthing conductor
Impedance contribution of an earthing conductor
Colour identification of an earthing conductor
Protection of an earthing conductor against external influences
Disconnection of the earthing conductor
Connection of the earthing conductor to the means of earthing
Chapter 4 System types and earthing arrangements
A system
TN-C system
TN-S system
TN-C-S system
TT system
IT system
Chapter 5 Protective equipotential bonding
The purpose of protective equipotential bonding
Main protective bonding conductors
Cross-sectional area
Additions and alterations
Earth-free local equipotential bonding
Bonding of lightning protection systems
Extraneous-conductive-parts common to a number of buildings
Installations serving more than one building
Multi-occupancy premises
Chapter 6 Extraneous-conductive-parts and their connections
Definition of an extraneous-conductive-part
Some examples of extraneous-conductive-parts
An example of a conductive part which is not an extraneous-conductive-part
Connection to pipework
Connections to structural steelwork and buried steel grids
Chapter 7 Automatic disconnection
Automatic disconnection of supply (ADS)
TN systems
Earth fault loop impedance
Automatic disconnection using an RCD in
TT systems
IT systems
Additional protection
RCDs in series
Automatic; disconnection for reduced low voltage system
Automatic disconnection and alternative supplies
Separated extra-low voltage systems (SELV)
Protective extra-low voltage systems (PELV)
Functional extra-low voltage systems (FELV)
Overvoltages imposed on the low voltage (LV)
system due to high voltage (HV) system earth faults
Chapter 8 Supplementary protective equipotential bonding
The purpose of supplementary protective equipotential bonding
Supplementary bonding conductor types
Csa of supplementary bonding conductors
Limitations on resistance of supplementary bonding conductors
Supports for supplementary bonding conductors
Locations containing a bath or shower
Shower cabinet located in a bedroom
Swimming pools and other basins
Agricultural and horticultural premises
Conducting locations with restricted movement
Medical locations
Temporary electrical installations for structures, amusement devices and  booths at fairgrounds, amusement parks and circuses
Static convertors
Other locations of increased risk
Where automatic disconnection is not feasible
Chapter 9 Circuit protective conductors
Circuit protective conductors
Cross-sectional area
Calculation of csa - general case
Selection of csa - general case
Non-copper cpcs
Evaluation of k
Calculation of csa - armoured cable
Selection of csa - armoured cable
Contribution to earth fault loop impedance
Armouring inadequate for a cpc
Termination of armoured cables
Steel conduit
Calculation of csa - steel conduit
Selection of csa - steel conduit
Maintaining protective conductor continuity
Steel trunking and ducting
Maintaining protective conductor continuity
Other metal enclosures
Terminations in accessories
Cpc for protective and functional purposes
Significant protective conductor currents
Labellings at distribution boards
Ring final circuits
Radial final circuits
Busbar systems
Connection of an item of equipment (protective
conductor current exceeding 10 mA)
TT systems
Earth monitoring
Proving continuity
Chapter 10 Particular issues of earthing and bonding
Clean earths
PME for caravan parks
Exterior semi-concealed gas meters
Small-scale embedded generators
Statutory regulations
Engineering Recommendation 683
Means of isolation
Warning notices
Up-to-date information
Solar Photovoltaic (PV) power supply systems
Mobile and transportable units
The term 'mobile or transportable unit'
Examples of mobile or transportable units
The risks
Reduction of risks
TN-C-S with PME
Protective measures
Additional protection
Highway power supplies and street furniture
Street furniture
Street furniture access doors
10.6.5 Earthing of Class l equipment within street furniture
10.6.4 Distribution circuits
Suspended ceilings
Exhibitions, shows and stands
Protection by ADS
Distribution circuits
Installations incorporating a generator
Final circuits
Medical locations
Type of system earthing
Fault protection
TT systems
Medical IT systems
Transformers for a medical IT system
Supplementary protective equipotential bonding
Marinas and similar locations
The risks
Minimizing the risks
Protection against electric shock
TN system
Cable tray and cable basket
EMC earthing and bonding
Electric vehicle charging installations
Appendix A Values of k for various forms of protective conductor
Appendix B Data for armoured cables

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