Flickering lights, tripping breakers, and discolored outlets are among the ways one can guess that wiring is overloaded. Add visual access, and you can tell if the sheathing may appear discolored.
But some of us who've been around electricity for a while have also developed an acute sense of smell for wiring trouble. There's a distinctive acrid odor that can be caused by melting components on a PCB, the plastic around a part, or the polyvinyl chloride (PVC) covering on the wire emitting vapor.
That odor on its own, even without visible smoke, is a heads-up to troubleshoot the wiring.
There are, however, flaws in the sniffing method of overloading detection. What happens if the overloading occurs in an overhead crawl space, for example? Or at a remote, non-staffed installation?
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