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Wire size and power supply for control panel LEDs
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I am newcomer about to embark on wiring up a DDC layout of about 7 x 10 feet. I think that I have the DCC wiring part figured out, but have questions related to the control panels. I plan on using low voltage 20 mA red/green 3-lead LEDs for turnout indication on my control panels (one for each route). These LEDs will be controlled by SPDT accessory switches mounted on my PECO switch machines. Most of the runs from my DC power supply should be 10 feet or less, though a few could be longer where I will have separate control from two panels. What would be the appropiate wire size for the wires running between the panels/power supply and the accessory switches? The charts that I have seen show recommendations for wires routing 1A currents and above, but nothing for the low amperage that these LEDs will use. Can I get by with 22 or 24 AWG for the runs, or do I need something larger? Also, I have seen it recommended to use stranded wire in control panels because the greater flexibility makes it easier to route the wire. Will this be a problem for soldering to the LED leads? I am planning to use terminal blocks at the panel and can change gauges and wire type there if needed. Also, I plan to use a simple DC converter (12V; 500 mA) as the power supply for the LEDs with approprately sized resisters in series. Is there any reason to go with a lower voltage or different type of power supply? Thanks for your help.
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