They were very serious about this stuff, for obvious reasons. No rework possible in space.
I still use those skills on my home DIY hobbies.
I suddenly started imagining someone trying to strip some wire, twist the strands together, hold a soldering iron and the solder and the wires all while essentially having Mickey Mouse fingers from being in a space suit. If something ever deserved the No User Serviceable Parts Inside sticker...
[0] https://www.wago.com/us/discover-wire-and-splicing-connector...
They’re 8x more expensive and take longer to install than a wire nut, and they take up more space inside the device box. They’re also difficult to unterminate without damaging the lever nut or conductor.
It’s not hard to splice #14 solid to #18 stranded with a wire nut, you just extend the smaller wire a bit beyond the end of the larger wire and twist.
I’d recommend wago lever nuts to homeowners doing their own electrical work because homeowners are terrible at electrical work and the less chances for electrical fires, the better.
I’m a commercial electrical project manager in the US.
sounds like it needs a ground! /s
but seriously, what kind of junction boxes are used outside the US that these would fit?
as far as connecting a larger device wire to a smaller mains line seems odd to me. granted, i'm not an electrician, but it is pretty much opposite of all of my experiences with wiring commercial lighting and home lighting
They make stab Wagos as well which I don't recommend, but the lever ones are great. You can work 'hot' if you need to replace a switch or anything (don't work hot blah blah blah). Much of my existing wiring is crappy 50s era copper and in some areas, aluminum -- so to add GFCIs where useful, I use either the levers to join copper of shitty provenance or the ALCU junction connectors and a bit of the paste.
There are other reasons that may be less apparent, like the fact that materials can have weird properties in space. One example is solder "whiskering"[1]. I believe NASA requires techs to be certified to the IPC-JSTD [2].
There are some elimination methods such as conformal coatings (very hazardous) and plating finishes (nickel/gold/palladium) that have been tested. I got certified by the IPC-J-STD-001H also soldering 201 surface mount components 0.6x0.3x0.25mm 0.05W handling.
Do we now understand why that happens?
(edit: minor side-rant about high definition 16mm films being preserved at 480p mpeg.)