Earth Cable Sizes ((exclusive))

If the live wire is , a 16mm² earth is often sufficient.

Electrical regulations vary by country and region. Always consult a qualified electrician or your local wiring codes (such as BS 7671, NEC, or AS/NZS 3000) before performing electrical work. earth cable sizes

Example: 10 mm² phase → 10 mm² earth. 25 mm² phase → 16 mm² earth. If the live wire is , a 16mm² earth is often sufficient

| Breaker / Fuse Rating | Minimum Earth Size (Copper) | Minimum Earth Size (Aluminum) | | :--- | :--- | :--- | | | 14 AWG | 12 AWG | | 20 Amps | 12 AWG | 10 AWG | | 30 Amps | 10 AWG | 8 AWG | | 40 Amps | 10 AWG | 8 AWG | | 60 Amps | 10 AWG | 8 AWG | | 100 Amps | 8 AWG | 6 AWG | | 200 Amps | 6 AWG | 4 AWG | Example: 10 mm² phase → 10 mm² earth

In certain environments, the standard earth size must be increased for safety. This is common in locations with high shock risk or where equipment is connected via a plug and socket.

For standard 13A or 20A power circuits (ring or radial), a 2.5mm² live/neutral wire is standard, usually accompanied by a 1.5mm² or 2.5mm² earth wire. 3. High-Load Appliances (4.0mm² to 6.0mm²)