What material is recommended for wire nuts used in high temperature applications?

The recommended material for wire nuts used in high-temperature applications is porcelain. This is because porcelain has superior heat resistance compared to materials like plastic and polystyrene, which can deform or lose structural integrity when exposed to high temperatures. Metal wire nuts might conduct electricity effectively, but they do not provide the same insulation properties needed for electrical connections, especially in environments where heat is a concern. Porcelain, on the other hand, is able to withstand high temperatures and does not suffer from the thermal degradation that can occur in other materials, thus ensuring both reliability and safety in high-temperature electrical installations.