[Boatanchors] Article on changing from 2 to 3 wire power cords
drossetti at comcast.net
Wed Aug 7 13:51:14 EDT 2019
According to Wikipedia, on a subject entitled Cheater Plugs, "In 1969 Underwriters Laboratories mandated three-prong plugs on major appliances for safety", and "At that time, only half of the receptacles in US homes were three-prong." Additionally, "In 1971, the US National Electrical Code (NEC) required grounded receptacles in all locations of the home (effective January 1, 1974)."
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On Aug 7, 2019 1:29 PM, David Rossetti <drossetti at comcast.net> wrote:
> Just as a data point, the house I grew up in was built around 1952 and used the two equally sized outlets. Seems the addition, added on in or about 1961 used the three pronged outlets. I also remember buying lamps in 1977 that had two equally sized prongs, something you won't see today.
> Dave Rossetti
> Sent from my Verizon Motorola Droid
> On Aug 7, 2019 11:42 AM, LARRY PICARD <lmpicard at rogers.com> wrote:
> > I live in an older home.
> > Before the knob and tube wiring was replaced a number of years ago, the original electrical outlets had only two slots and they were both the same size.
> > Does anyone know when three prong plugs and polarized plugs and their respective receptacles came into use?
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