PVC is available at various temperature ratings, ie 75°C, 90°C and 90°C-HT. As XLPE is rated at 90°C what's the difference between that and the higher rated PVC?

PVC is available at various temperature ratings, ie 75°C, 90°C and 90°C-HT. As XLPE is rated at 90°C what's the difference between that and the higher rated PVC?

All grades of PVC are nominally rated at a 75°C operating temperature for normal installations however the higher PVC rated cables can operate at higher temperatures under certain conditions. These conditions are outlined in AS/NZ 3000:2000, but generally limit the time at which they can operate at those temperatures and restrict their usage where there is no potential for mechanical damage (PVC softens considerably at these temperatures). XLPE does not soften at 90°C and hence does not have the installation and operation restrictions of PVC.

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