Wow- even in flyover country in southern Indiana, 3-wire circuits were
standard practice, and I assume required, by the early to mid 60s. My
Grandmother's 1961 house was 100-amp 2-wire, my Fathers 1966 folly just down
the street was 200-amp 3-wire. This SW Michigan 1960 cookie cutter was wired
with 3-wire and grounded metal boxes, but 2-hole outlets, which I have since
switched. (Yes, I assume current code requires a ground pigtail to the
outlet, but the test meter is happy, so I'm happy. That old wire is way too
stiff, and there is no slack, so I wasn't about to try fishing the copper
from under the clamps. At least I got the polarity right, unlike the last
guy on half of them.)
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