In article ,
toller wrote:

To answer your other question, the hots are interchangable; there is no
reason to distinquish between them.

In theory, true. But for my own house, I don't like it. On all the
240V circuits, I have checked that black and red are not mixed up.
This is really easy to do when wiring the house, and makes everything
look neater.

Here's another thing that worked out good. When we built the house,
the local electrical distributor had a sale on strange-colored wire.
So I used quite a bit of blue, purple, red, and such. This makes a
complicated box with multiple switches easier to understand. For
example: Black is the hot feed going in; red is the output to the
light, and blue and purple are the switch legs between three-way
switches.

You might want to think about using 4wire so your hots will be
black and red. You will have the white available as a neutral if you ever
need it. I didn't do that when I ran 240v to my shop and I regret it.

Absolutely. All of my 240V outlet circuits are run with 4-wire cable
(but not the dedicated 240V circuits for pump motors, where a neutral
will never be needed). Sadly, all but two of the neutrals remain
unused. The two used ones a The dryer (which uses the currently
code-legal 4-pin connector), and the drill press (where rewiring the
motor to 240V will require a neutral conductor so the work light on it
can stay at 120V).

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Ralph Becker-Szendy