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The nicely shaped plug is now a more organic shape.
The sides have melted in and cover the internals.
The protective sleeves on the lower 2 pins no longer exist.
The socket has a nice new black mark on them (where the plug melted itself into the socket and bonded).
The cable was hot to touch.
I'm glad I was able to get the plug out, and that I was here in case a fire occurred. I will not be charging off of my mains now.
Oooh... I had a 1.5mm flex cable and an all-weather shield.
Had is past tense as the plug that goes into the wall here just melted.
I've been advised by a forum of electricians that home charging from mains:
https://www.electriciansforums.net/threads/3kw-constant-load-on-a-standard-plug-socket.196136/
Yup... I melted my plug 😂
So I now won't charge at home unless I use a dedicated circuit, because the chance of fire is fairly high. The 13A plug and 1.5mm flex I was using, very much like you are using, were hot to touch.
I'm going to be investigating a Pod Point in my front garden against the wall, even though I still will need to run the cable to the road: https://pod-point.com/solutions/driver/home-charging
The problem with the cable you've purchased, the capabilities are based on spikes rather than constant load. You need to go bigger, but then your home circuit is the problem.