Earth cables are typically identified by their green and yellow insulation. The size you need depends on the cross-sectional area (CSA) of the "line" or "live" conductors in the circuit. 1. Domestic Lighting Circuits (1.0mm² to 1.5mm²)
Long cable runs increase resistance. You may need to "size up" the earth cable to ensure the circuit breaker trips fast enough at the furthest point. earth cable sizes
Based on overcurrent device rating (Table 250.122 NEC): Earth cables are typically identified by their green
Copper is the standard. Aluminum requires a larger cross-section to achieve the same conductivity. earth cable sizes
There are two primary ways to determine the required cross-sectional area (CSA) of an earth conductor: