I was rearranging stuff in my basement and found a strange looking receptacle. It is on a 15A circuit in an 1950s house. It is in a room that I suspect (for a bunch of reasons) was finished by the owner rather than the builder, probably in the 1960s or 1970s.

strange looking receptacle

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    It's a very naughty one because it can accept plugs now designated for either 120 or 240. – George Anderson Apr 1 '20 at 20:08
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    Can't say for sure, but I imagine this was some kind of... transitional outlet when they were still standardizing outlets for 15A, 20A, and 220v... – JPhi1618 Apr 1 '20 at 20:09
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    That house-incinerator is the ancestor of the house-incinerator I found! – Joseph Sible-Reinstate Monica Apr 1 '20 at 20:31
  • The good news is I got a bunch of stuff - including more 15A duplex receptacles - from Home Depot (I've ordered tons of stuff online for work (computer business) but these last 2 weeks I've started ordering everything personal online too, except groceries (for now)) so I have everything I need to replace it (along with the others I'm replacing to get grounded). – manassehkatz-Moving 2 Codidact Apr 2 '20 at 0:56

It's a plug that accepts Hubbell's 1906 tandem and 1912(?) parallel plugs. Both were rated for a maximum of 250v, but usually wired for 120.

Similar rating to Edison 1" (now called E26), most are rated for up to 250v, but we commonly see them used only for 120v.


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