ERATH WIRE STANDARDS: IEC, DIN, BS, ASTM, JIS, CSA ... Standards: BS7211, EN 50268, BS EN 50267-2-1, EN 50267, EN 50265, IEC 603323. Construction: ... BS EN 60228:2005 (previously BS6360) Class 1 solid: 1.5mm² and 2.5mm² Class 2 stranded: ... 0mm² Circuit Protection Conductor (Earth): Class 1 solid plain copper conductor: 1.0mm², 1.5mm², 2.5mm², 4mm² and ... Brown, Black, Grey + Plain PVC insulated earth wire