Another question made me curious, does the NEC allow copper wire to be joined to aluminum wire by soldering?
Electrical Wiring – Is Soldering Copper to Aluminum Wire Allowed Under NEC
aluminum-wiringelectrical
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Best Answer
You mean like a rattail or Western Union splice, Al-Cu?
Your first problem is that soldering in general is so alien that an AHJ is likely to reject it out of hand, even if it were all Cu. The ruling would likely be "You can solder if you can show how every other splicing method is impracticable".
But when it comes to Cu-Al splicing...
The sections I put in bold are in contradiction with each other. 110.14(B) requires direct contact between the Cu and Al wires, yet 110.14 forbids it.
The path to soldering is plainly identified in 110.14 with "soldering lugs".