Hey....I'm doing some research on how electiricty was used back in the old days....say from it's induction around 1890 up to around 1960.
One of the things I'm still leaning is about the NEMA 2-15/2-20 receptacles and plugs...for those that don't know the NEMA 2-15 receptacle is better known as the "t-slot receptacle...it looks sort of like the typical 5-20 receptacle you can buy at the hardware store except this is an ungrounded receptacle with T-slots on both the neutral and the hot.
So far from what I have gathered the "dual T slot receptacle" could be wired for either 120 volts or 240 volts. The slots look like this: -II- and the tandem slots, or the -- slots were used for the 240 volts while the standard II slots were used for 120.
I'm curious as to what ran off of a 240 volt 10 amp circuit in the old days?
Also I'm curious if anyone knows when these receptacles were made?
