... -2-1, EN 50267, EN 50265, IEC 603323. Construction: Conductor: Plain copper conductors to BS EN 60228:2005 (previously BS6360) Class ... ², 1.5mm², 2.5mm², 4mm² and 6mm² Class 2 stranded plain copper conductor: 10mm² and 16mm²Insulation: XLPE (Cross-linked Polyethylene ... : 15 x overall diameter Core Identification: 2 Cores: Blue, Brown + Plain 3 Cores: Brown, Black, Grey + Plain PVC insulated earth wire