ERATH WIRE STANDARDS: IEC, DIN, BS, ASTM, JIS, CSA, NFC, AS ETC. ... : 16.0mm² Circuit Protection Conductor (Earth): Class 1 solid plain copper conductor: 1.0mm², 1.5mm², 2.5mm², 4mm² and 6mm² Class 2 stranded plain ... , Brown + Plain 3 Cores: Brown, Black, Grey + Plain PVC insulated earth wire