When sourcing 70mm XLPE (Cross-linked Polyethylene) cables, you must verify the conductor material (typically 99.9% oxygen-free copper or electrical grade aluminum). Ensure the insulation thickness meets international standards (e.g., IEC 60502-1) to guarantee dielectric strength. For 70mm² cross-sections, confirm the current-carrying capacity (ampacity) matches your specific installation environment, whether in-air, underground, or in-conduit, as XLPE allows for a maximum conductor temperature of 90°C.