[SML] ground history

[NODEraser]

On Mon, May 17, 2021 at 9:25 AM Joe via Stagecraft
<stagecraft at theatrical.net> wrote:
>
> It was only a few years ago that Pennsylvania enacted a statewide building code.  So I imagine electrical codes have varied considerably over time and location.
>

Even today, it is up to each state (and in some states, each county)
to specify which version of the NEC to adhere to. So yes, I imagine
that it would be pretty difficult for home inspectors and the like to
know which version a structure should have been built to, without some
local knowledge.

https://www.nema.org/docs/default-source/technical-document-library/nec-adoption-map.pdf

1962 sounded right to me, but as noted above it may have been some
years before it was standard across the country.

https://activerain.com/blogsview/5316746/the-history-of-grounded-receptacle-in-residential


[Greg Bennett]
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