This interesting article, submitted by Member Larry McCarthy, can be found on Tonystrains.com. Of particular interest are the first few paragraphs of how a decoder tests if it is receiving DC or DCC power.
A second point in the article confirms that almost all operators are bound to cause a short circuit now and then.
CLICK HERE to read the article, which will open in a new tab or window.
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Broken link 4/5/2019