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tion, thermoplastic PE was very popular, compared to paper insulation, as insulation for cables because of its low cost, electrical properties, processability, moisture and chemical resistance, and low temperature flexibility. A significant design issue with PE [5], in its thermoplastic state, was that its temperature of operation was limited to 70°C. Consequently, it could not match the temperature rating of paper-oil insulated cables. This problem was solved with the advent of crosslinked polyethylene (XLPE), which had the ability to match the thermal rating of paper-oil insulated cables and provide the freedom from the

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