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Polyjim, It is common for power connections to use black wire for 'ground' or low voltage (negative) and red wire for positive or high voltage when wiring DC circuits. For AC circuits, green is usually used for ground and white, black and/or red wire for the other voltage connections. Having said that, I use black insulated wire for the common rail and red wires for the other rail. I use green wire for the common (ground) wire on AC powered switch machines and other colored wire (like blue and yellow) for other switch machines. This leaves white wire for other future applications like block detection. You can also purchase wire with two color insulation like white wire with a grey stripe. I also tag the red wire with the block number and the blue and yellow wire with switch machine numbers. It also helps if you dedicate one color (either blue or yellow) to the 'normal' switch machine position. I hope this helps. - Ed
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