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A comment on Why does the USA use 110V and UK use 230-240V?. Parent comment

Re:Why does the USA use 110V and UK use 230-240V? by mindslight on Tuesday August 29, 2023 @01:13PM (#37310911)
12-2 NM/Romex is fine for 240V (120V+120V), and is commonly used for things like large ACs, heaters, etc. Mark the white wire with red electrical tape at both ends.
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