Because it is for situations where the conductors are mostly used as feeders to supply larger amounts of current .In smaller conductors it just makes sense to go to the proper size conductors. In a large feeder situation there are limits to what can fit into conduit and still supply the amperage . There commonly is not EMT larger than 4" and space limitations in crowded ceiling and mechanical rooms have limits.Parrallel runs must be kept close to the same length and terminated at the same bus to avoid overheating one set the current is favoring. In smaller circuits what is called for is one set per circuit of correct size wires. How overcomplicated would it get if everyone started paralleling 12s and 10s etc. Junction boxes would be a nightmare.Terminations would have to be equal and when not landing on large bus that would get complicated too.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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