<div dir="ltr">I don't know but <a href="https://forum.nachi.org/t/gfcis-code-changes-history-chart/11786">https://forum.nachi.org/t/gfcis-code-changes-history-chart/11786</a> seems to say later than 60's.  </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 17, 2021 at 8:05 AM Stephen Litterst via Stagecraft <<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Early' 60s, I want to say '63.  It was a year or so before aluminum wire was introduced for residential wiring.  <br>
<br>
I learned this when I bought a house from the era and the inspector was pleasantly surprised to find ground wires and copper wiring.<br>
<br>
<br>
Stephen Litterst<br>
ETCP - Certified Entertainment Electrician<br>
<a href="mailto:slitterst@gmail.com" target="_blank">slitterst@gmail.com</a><br>
<br>
<br>
<br>
> On May 15, 2021, at 8:38 PM, Dan Sheehan via Stagecraft <<a href="mailto:stagecraft@theatrical.net" target="_blank">stagecraft@theatrical.net</a>> wrote:<br>
> <br>
> Anybody know when codes started to require<br>
> "Edison" outlets be 3-wire including green wire ground,<br>
> as opposed to the former 2-wire hot&neutral only ?<br>
> -- <br>
> ...Dan Sheehan<br>
> Fixer of things that break<br>
> TD Walpole (MA) Footlighters<br>
> <br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature">Bill Conner Fellow of the ASTC</div>