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Do not use Black & White as the colors for this wiring. In 120 volt AC circuits, Black is the hot, ungrounded wire and white is the neutral, grounded wire. Red and black are the old code wire colors for DC (yes, the DCC buss carries AC). To simplify, I would go with red and black (or whatever color the current DC negative is now)! I would twist about a half turn per foot.
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