Why Is One Receptacle Outlet Slot Bigger Than the Other?

Outlet Receptacle 1 Pigtail Connector 1 Pin and Sleeve Receptacle 3 in T 1 1 4 in 1 4 1 4-12 x 1-34 x 4-12 in 1 1 x x

T-Slot Mount Window Weatherstrip Seal 516 Bulb Bubble for 316 Slot Receptacle 3 Colors & 5 Length Options : : Home Improvement

tiger claw slot cutter 5-20R T-slot receptacle mounted with the hole for the ground pin at the top The neutral connection is the wider T-shaped slot on the right All NEMA 5

tslot covers Eagle Weatherproof Outlet with Cover Eagle: Type cover for protection against dust, corrosion and wear, suitable for indoor and outdoor use