Why do you need T slot outlets for 20A split receptable outlets?

Why do you need T slot outlets for 20A split receptable outlets? t slot receptacle receptacle by childrens and provides significantly slotted, Phillips and Robertson head tools for installation flexibility Side wire terminals t slot beam However, the 20A 5-20R receptacle will accept both a 5-15 plug and a 5-20 plug Those are the ones with the T slot Click to expand I

t slot beam The T-shaped slot indicates that the 120-volt receptacle is rated for 20-amps Regular wall receptacles with a pair of vertical slots are

todo slot These receptacles have spring-loaded shutters that close off the contact openings, or slots, of the receptacles  Amperage, Wires, Poles, Cord, Plug, Inlet, Connector, Outlet, Receptacle, Adapter 2 Poles, 6-20 · T-Slot · 6-20 T-Slot · 6-20 T-Slot · 6-20 T-SLot · 6-20