When we were building out a factory in Saarbrucken Germany around 2009, we had to bring everything to get the manufacturing equipment installed. This of course, included a massive assortment of wire nuts.
The very first piece of equipment we installed needed a 240v drop so we wired it in. Because of "German safety law" everything requires an inspection by a licensed German electrician. Even basic stuff.
Anyway, he opened the panel and had a heart attack. WIRE NUTS! WIRE NUTS ARE A FIRE HAZARD! I swear if he could have run around with his hands in the air screeching, he would have.
Anyway, one of the local electricians came over, gave us a pile of Wagos and we wired the rest with Wagos. I've been wiring EVERYTHING I touch with Wagos since then. I probably have 500 of the various ones in my van right this moment.
I know how to properly use wirenuts, i.e. the wirenut is really nothing more than a cover and the twisting is the proper connection. That said, when you have a solid and a stranded, it's 100% better to use Wagos. Pretty much every light fixture and fan has stranded, every supply wire is solid.
When pushing them back into a fixture, it may be sometimes prudent to tape the lever down but beyond that, it's a better, more consistent connection.
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