I was going by Figure 2.3 in OSG.
Table 4.2 shows that earthing conductors as small as 2.5mm² can be used for local earth not less than 1Ω for a TT supply. With such a local earth, surely the maximum fault current is less than 230A.
Consumer Unit Main Switch
- Thread starter jcapes
- Start date
Table 4.2 shows that earthing conductors as small as 2.5mm² can be used for local earth not less than 1Ω for a TT supply. With such a local earth, surely the maximum fault current is less than 230A.
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