@kitten I think stuff just does not conduct heat as well as it does power.
A „normal“ German 16A Socket uses 3 copper wires with at least 2,5 mm² of copper per wire to deliver 3,68kW of power.
If your oven is 160K warmer then your wall and is connected to your wall with 3 (thermally parallel) 1m long wires having a cross-sectional area of 2,5mm² each they will transfer about 0,5W of heat into your wall. (If you shorten the wire to 30cm the energy transferred rises to 1.6W) (Source of the formula and Source of the properties of copper)
@kitten Transferring electricity is way easier than transferring heat, you need much less cross-sectional area. So a few cms close to the heating element do get hot, but the temperature falls pretty quickly. Those few cms are usually inside the appliance and made from heat-resistant wire, at the end of which you clamp your regular wire and at that point it's just warm.
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