Discuss No R1 on ring main? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

I understand it is a TT system. If the main earth cable is not buried it need only be 4mm
If buried should be 16mm.

Table 10c OSG.
 

Reply to No R1 on ring main? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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