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[Crissa]

The expensive part is the cable you have in your hand.

-Crissa

[motorrad36]

The expensive part is the cable you have in your hand.

-Crissa

Yeah, and it only set me back $20 and a nice ride 

[ESokoloff]

...............

The heavy-gauge wires (green, white and black) are earth ground and two hot phases of the 240VAC, respectively, ...........

This would not be to code.
White is Neutral & MUST Not be hot!!!!

Of course a roll of black tape will easily remedy that (cover all traces of white insulation).

[Crissa]

They're not both black because they're opposite of each other.

-Crissa

[ESokoloff]

They're not both black because they're opposite of each other.

-Crissa

I’m not aware of any code violation of having both hots black but it is a code violation to have a hot white.
If you have an issue with two black hots, use a different colored tape (other then green which is reserved for ground only).

Note: I’m in the USA.

[Crissa]

It's 250v, you can't use the same color choices as 120v.  They need to be able to be differentiated if they're on different phases in the same wire.

White - inside a wire - may be on the hot side side of a circuit such as when you wire devices on a switch or multi-switch in series.

-Crissa

[ESokoloff]

Done

[ESokoloff]

Done

I lied....

One more/last attempt at this
https://en.m.wikipedia.org/wiki/Electrical_wiring_in_North_America#Wiring_methods

[Crissa]

... In 240-volt applications not requiring a neutral conductor, the white wire may be used as the second hot conductor, but must be recolored with tape or by some other method.[citation needed] Four-wire flexible equipment connection cords have red as the fourth color; ...

Where would you even modify the wire color?  It'll be inside a NEMA plug.  Not a work box.

-Crissa