Earth Cable Sizes Page

Note: For motor circuits, sometimes a larger EGC is required.

| Application | Typical Phase Size | Typical Earth Size (Copper) | | :--- | :--- | :--- | | | 1.5 mm² | 1.0 mm² or 1.5 mm² | | Ring Main / Sockets | 2.5 mm² | 1.5 mm² (Standard T&E) | | Shower / Cooker | 6.0 mm² | 2.5 mm² or 4.0 mm² | | Sub-Main Distribution | 16 mm² | 16 mm² | | Main Supply Earth | N/A | 16 mm² to 25 mm² | earth cable sizes

Free Cable Sizing Calculator AS/NZS 3008.1.1 - ELEK Software Note: For motor circuits, sometimes a larger EGC is required

Here’s a concise review of (protective conductor / grounding wire sizing) based on common electrical standards (IEC, BS 7671, and NEC). Note: For motor circuits