Earth Conductor Size Table Jun 2026

Exposed metal parts could remain energized at dangerous voltages. How to Determine Size: Two Main Methods

The tables above apply to circuit protective conductors (the ground wire inside your cables). However, the (the wire connecting your consumer unit/switchboard to the ground rod/plate outside) has different requirements. earth conductor size table

This uses a pre-calculated ratio based on the size of the "Line" or Phase conductor. It is the safest "rule of thumb" for most installers. If the phase wire is ≤16mm2is less than or equal to 16 m m squared , the earth wire should match it. If the phase wire is between 16mm216 m m squared 35mm235 m m squared , the earth wire can be 16mm216 m m squared If the phase wire is >35mm2is greater than 35 m m squared , the earth wire should be at least half the size. 2. The Adiabatic Equation (Calculated) Exposed metal parts could remain energized at dangerous