FLEX-SOL-XL is single-pole, double insulated cable that has been developed for heavy-duty, low-voltage, outdoor or indoor wiring and has expected usable lifetime in photovoltaic applications of 25 years or more. Use of chemical cross-linking in insulation produces greater reproducibility and increased material homogeneity, as well as giving cable improved long-term temperature stability in high-humidity environments. Insulation also provides higher mechanical strength, improved abrasion resistance and greater flexibility in cold conditions.