They have four screws so that you can run power to another receptacle off the second set. It makes no difference which set you connect your wires to. For the switched outlet, you need to break the little brass tab off that runs in between the upper and lower screw sets.
Does it matter if you use top or bottom screw on outlet?
You only need to connect to (1) screw on either side. This allows for a separate circuit to be wired to the other screw and allow the upper and lower receptacles to work independently of each other. This circuit allows for the bottom receptacle to be switched while the top receptacle will remain hot at all times.
Why do you pigtail outlets?
Use Pigtails on Outlets There are two reasons for this. First, connecting the wires leading to downstream outlets with wire connectors creates a more secure connection. And second, its easier to press the outlet back into the box if fewer of its screws are connected to wires.
What are the screws on the side of an electrical outlet for?
Screw terminals are capable of making a tighter connection with the wires, which not only prevents the wires from coming loose; it also creates a better electrical connection.
Do you need special screws for outlets?
Receptacle screws are used to fasten outlet boxes or other receptacles to existing construction. Long screws are useful when mounting switch covers to thick surfaces, such as those with paneling. These receptacle screws feature a truss head, which is wider than both round and pan head screws.
How many wires can you pigtail?
The only appropriate way to wire a receptacle in a box with three cables is to use pigtails to connect the receptacles. Never connect more than one wire under a single screw terminal.
How do you pigtail 3 wires?
1:106:21How To Make An Electrical Pigtail - YouTubeYouTube
What size screws are used in outlets?
The standard screw gauge for home electrical outlets, boxes, switches and cover plates is #6. The gauge size is the diameter of the screw.
What size screw goes in outlet?
TLDR: outlet boxes are typically provided with 6-32 or 8-32 machine screws for mounting the cover into similarly threaded holes in the box. Electrical boxes are provided with means for securely fastening covers, and in device boxes, for mounting wiring devices, such as snap switches and receptacle outlets.
Can a 4-wire dryer cord be 3?
Answer: You dont. It is not possible to install a four prong outlet using only three wires either legally or safely. Put the three prong outlet back and install a new three-prong cord on the dryer.