Sunday, August 7, 2016

A Two-Prong To Three-Prong Adapter Cord




This short (under four feet) extension cord has a two-prong plug, and a three-prong receptacle. Why would anyone make such a thing?

The answer to that question lies in an obsolete form of house wiring known as 'knob-and-tube'. My dad's house had that type of wiring, and the outlets that accompany knob-and-tube wiring are two-prong outlets, not three-prong as with modern wiring.

So, to plug in a three-prong cord, one would need an adapter such as the one pictured here.

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