What do the designations RHZ1, AL, OL, and 2OL stand for in the cable name?

The RHZ1 AL / OL / 2OL designation, as supplied by Chinne Electric, defines a halogen-free low-voltage power cable with an aluminium conductor. RHZ1 signifies a halogen-free compound meeting low smoke and corrosive gas emission requirements, AL indicates the stranded aluminium conductor constructed to Class 2 of IEC 60228, and OL denotes a single polyolefin sheath while 2OL specifies a double-sheathed construction for enhanced mechanical protection, all in accordance with IEC 60502-1.