I have one! However i loaned out the crimper, it's never been returned.
Mine however cost $15 at Harbor Freight about 30 years ago. Works great for splicing barbed wire.
They've gone up considerably.
AFAIK, every AC/high-voltage electrical wiring connection must be inside a junction box.
"In the United States, the
American National Standards Institute (ANSI) establishes nominal voltage ratings for
60 Hz electric power systems over 100 V. Specifically, ANSI C84.1-2020 defines
high voltage as 115 kV to 230 kV,
extra-high voltage as 345 kV to 765 kV, and
ultra-high voltage as 1,100 kV.
[2]"
source_
Wikipedia
While not mentioned there, anything over 48VDC is also considered high-voltage, as it can kill.