A duplex receptacle has two devices in a composite assembly on one yoke. It is the receptacle that is what you commonly think of as a receptacle [two places to plug in a lamp...] rather than a single receptacle, which has a place to connect one device.
Removing the connecting bar as described in earlier answer merely allows two circuits or separate control of the two devices.
original answer: a duplex receptacle is a normal looking receptacle but the little piece of copper bar between the terminal screws on the power side has been broken off and two different circuits feed the two screws- WRONG!
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A duplex grounded receptacle is a type of electrical outlet that has two sockets, allowing two devices to be plugged in at the same time. It is grounded to help protect against electrical shocks and is commonly used in homes and commercial buildings for safe electrical connections.
The long slot on a duplex receptacle is the neutral pin.
The strap or yoke on a duplex grounding type receptacle is the metal component that connects the two outlets together. It serves as the common connection point for the ground wires in the receptacle to ensure proper grounding.
A parallel duplex receptacle is a type of electrical outlet with two separate plug openings, allowing two devices to be plugged in side by side. This type of outlet is commonly used in homes and commercial buildings to provide multiple power sources in a single location.
The machine screw size that typically comes with a U-ground duplex receptacle to mount it to a 1004 box is usually 6-32 x 1/2". However, it's always best to check the manufacturer's specifications or the installation manual to confirm the exact size needed for your specific receptacle and box.
It is generally not recommended to mount a 20 amp duplex receptacle above a hung ceiling due to accessibility issues for maintenance and safety concerns. It is important for receptacles to be easily accessible for inspection, maintenance, and in case of electrical issues.