[SML] ground history

[Bruce Bennett]

In the early 1960s in residences in North America. It was not introduced all at once, but first in kitchens and bathrooms (1961 in the NEC I believe).

Bruce

"A society grows great when old people plant trees whose shade they know they shall never sit in." - Greek proverb

> On May 15, 2021, at 20:41, Dan Sheehan via Stagecraft <stagecraft at theatrical.net> wrote:
> 
> 
> Anybody know when codes started to require
> "Edison" outlets be 3-wire including green wire ground,
> as opposed to the former 2-wire hot&neutral only ?
> -- 
> ...Dan Sheehan
> Fixer of things that break
> TD Walpole (MA) Footlighters
> 
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