Dryer Wall Outlet
#21
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The NEMA 14-30x standard has been around for quite a while, however it only became mandatory within the National Electrical Code within the past 10 years or so. And it's not technically "ungrounded", since the neutral wire in a home is always bonded to ground at the panel. We've just evolved to the point where running safety ground across a current-carrying wire is no longer in vogue. Bonding neutral and ground within large appliances used to be extremely common practice.
By contrast, NEMA 5-15 (120v with separate neutral and ground) receptacles have been mandatory in new construction in the US since 1962. So any home build from the early 1960s until the past 10-15 years or so would be expected to have grounded wiring everywhere except for the appliance outlets. Thus, I wouldn't expect the home to have "no grounds anywhere" unless it's older than 1962.
#23
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One of them has grounded wiring. The more recent one I bought does not (I think it may be a few years older, but not much as its in the same area)
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