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What does the RHZ1 AL / OL (TRIPLEX) designation mean?

The RHZ1 AL / OL designation breaks down as follows: ‘R’ indicates XLPE (cross-linked polyethylene) insulation, ‘H’ denotes a halogen-free compound for the outer sheath, ‘Z1’ refers to the longitudinal water-tightness feature, ‘AL’ specifies stranded aluminium conductors, and ‘OL’ identifies the special oil-resistant and flame-retardant outer layer. This combination ensures safe, moisture-protected performance in industrial and urban networks, compliant with UNE 21123-2 and IEC 60502-2.