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Conventional plugs, sockets, connectors, cables, and insulations are not suitable for applications where heat is generated or cabling is run in areas of excessive temperatures. Many connectors and normal cable insulations are made of PVC which will melt and degrade from around 100°C onward.
It should also be noted that copper becomes brittle if subjected to higher temperatures. Many breakdowns in industry are due to copper cabling and plated copper lugs being used to connect heating elements.
In these cases, only nickel wire and nickel lugs should be used, as production machinery generates vibration through motors and movement, leading to failures on copper connections.