The meaning of the ZR-YJY22 cable specification model

For example: ZR-YJY22-8.7/10kV-3×240

①ZR-YJY22 is a material representing the characteristic properties of the cable

Flame Retardant XLPE Insulation Copper Core PE Inner Sheath Double Steel Tape Armor PVC Outer Sheath.

② 8.7/10kV-3×240 describes the voltage and the number of square cores, specifically

The phase voltage U0 of the cable design is 8.7kV; the line voltage U of the cable design is 10kV; three wire cores, each with a nominal cross-section of 240mm2.