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Page Domestic protective equipotential bonding layouts

Domestic protective equipotential bonding layouts
This section provides diagrams of typical protective equipotential bonding layouts. It has been added to provide further guidance on typical layouts of bonding conductors, and also assists with recognizing earthing arrangements. Many other layouts are, of course, possible.
Figure 1. shows the main earthing terminal connected via the earthing conductor to the utility cut-out stud terminal (TN-C-S).
Figure 2. shows the main earthing terminal connected via the earthing conductor to the sheath of the utility supply cable (TN-S).
Figure 3. shows the main earthing terminal connected via the earthing conductor to the installation earth electrode (TT). The earthing conductor in a TT installation may only need to be 6 mm2 although it is shown as 16 mm2 in this diagram.
Figure 1. Figure 2.


KEY
1 >Earthing conductor
2 >CPCs
3 >Main protective bonding conductor
4 >Metal water pipe
5 >Metal gas pipe
6 >Cut-out earth terminal
7 >Main earthing terminal

Supplementary equipotential bonding :
Supplementary bonding is additional protection to fault protection, and may be required where the disconnection standard time cannot be achieved. However, the use of supplementary bonding does not exclude the need to disconnect the supply for other reasons, for example, for protection against overcurrent.
Supplementary bonding may also be required for special locations such as:
* locations with a bath or shower;
* swimming pools and other basins;
* locations with livestock;
* conducting locations with restricted movement
Figure 3.