In one room of the apartment we rent, there's recessed 12v MR16 halogen lighting. There are 3 different circuits with dimmers.
I noticed that two of the bulbs were humming loudly even when dimmed all the way up. One light was constantly going off and on and flickering.
I took a closer look and I saw that the connections between the incoming 12v wires and the short wires going to the socket were in bad shape. Those connections were apparently made using wire nuts, and the plastic from the nuts had melted away completely. On one lamp, there was no plastic left at all, the naked wires enclosed by the wire nuts' metal spirals were sticking out. On the other lamp, one wire looked the same, and on the other one half a plastic cover was left. See the photos.
What's the proper, heat-safe way to connect the wires in this case? There's not much room in there, see the fourth photo below. I usually use WAGO lever connectors instead of wire nuts when I connect something and I was going to do the same here when I re-do the connections, but I'm not sure they'll perform any better in heat.
I'm also investigating replacing the halogen bulbs with LED ones anyway, so there might be a bit less heat in the future (BTW, any tips for MR12 LED bulbs?).
How is this usually done? I imagine there is often a need to connect the incoming wires in close proximity to the (hot) bulb in ceiling installations like this?