CDD3000-HF Operation Manual
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Minimum cross-section of the grounding lead to DIN VDE 0100 
Part 540
Cross-section PE mains connection
Mains power cable
<10 mm²
Grounding lead (PE) cross section of at least 10 mm² or lay a 
second electrical conductor parallel to the existing grounding 
lead, because the operational leakage current is > 3.5 mA.
Mains power cable
>10 mm²
PE conductor with cross-section of mains power cable - see 
VDE 0100 Part 540
Table A.5 Minimum cross-section of the grounding lead