Why Does My Electrical Outlet Have 4 Wires at How1

Why Does My Electrical Outlet Have 4 Wires. 2 circuits in out outlet, 3 white wires on one side of outlet. Does this pose any problems as far as safety in my home.

Reversed polarity creates a potential shock hazard , but it’s usually an easy repair. If the power is cut by the first gfci, the otherwire won't reset. Duplex receptacles have (4) screws for termination points along with a green screw dedicated for ground.

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Also asked, why does light switch have 2 black wires? An outlet may have two hot wires so that one wire may function as an ‘always on’ transmutation from the power supply, feeding the other wire. Does this pose any problems as far as safety in my home. Actually, to be clear, it would be 4 wires under each wirenut.