Originally Posted by dabrooks
These are photos of a duplex that I had in my electric supply bin. It is a 125 volt 20 amp duplex and could be exchanged for the one at your storage facility.
The horizontal slot is the neutral slot and the vertical one is the hot side. One the horizontal you can see the silver screws. You should have the one in there test as shown in the diagram that "Old-Biscut" posted. If you replaced the one there with one of these it would carry 20amps and could still be used for the original intent because it has both the vertical and horizontal slot on the neutral side.
The plug the OP posted is a NEMA 6-20 it will not fit in a NEMA 5-20R without a BFH. the 6 is rated for 250 Volts
This receptacle will also accept the 15A/125V 2-wire (NEMA 1-15P)
or 3-wire (NEMA 5-15P), male plugs above.
20 amp. 125 volt
Uses include old style window air conditioners, large electric heaters,
certain machines and office equipment in commercial applications.
1 hp rating
Notice that you can plug a standard 15A/125V male plug into this female receptacle but not the
other way around.
Most codes require that this receptacle be used when wiring a single receptacle on a 20 amp. circuit.
This receptacle will also accept the (NEMA 6-15P)
15A/250V male plug above.
20 amp. 250 volt
Most common household 250 volt plug. Used in many larger window air conditioners and some large home use air compressors, certain machines and office equipment in commercial applications. 2 hp rating
Notice that this configuration is the opposite of 20A/125V but can be confusing when looking at the plug. They are mirror images of each other
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