PowrServ® XL Underground Secondary Cable Type USEI-90. USEI-90 Underground Service Entrance Cable consists of two, three, or four compact aluminum conductors individually insulated with black RW90 XLPE insulation, a colored PVC jacket and twisted together. The neutral conductor will be white. The product meets the USEI-90 cable requirements of CSA C22.2 No. 52. The aluminum stranded conductors are Class B compact 1350-H16 (3/4 hard) aluminum. The insulation is a black Cross-linked Polyethylene (XLPE) meeting the requirements of CSA C22.2 No. 52 for Type RW90 insulation. A continuous layer of PVC is extruded over the insulation. The jacket is a weather-resistant, non-sulphide-staining, cut-through-resistant, 90°C/-40°C FT1-rated material.