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Earthing & Bonding Conductor Sizing
Size the earthing conductor (Table 54.7 or adiabatic), main protective bonding (Table 54.8 / PME) and supplementary bonding to BS 7671.
The Ensign ToolboxEarthing & Bonding Conductor SizingSize the earthing conductor (Table 54.7 or adiabatic), main protective bonding (Table 54.8 / PME) and supplementary bonding to BS 7671.
Supply
PME main bonding sizes from the supply neutral (Table 54.8); TN-S / TT from the earthing conductor
mm²
Copper-equivalent csa — confirm with the DNO
Earthing conductor
mm²
Keys Table 54.7: S ≤ 16 → S; 16 < S ≤ 35 → 16; S > 35 → S/2
Supplementary bonding
mm²
The smaller CPC when connecting two exposed-conductive-parts
Enter the line conductor and CPC csa to size the conductors