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Push-in wiring connections (backstabs) on standard residential receptacles lose spring tension over time due to thermal cycling. The Consumer Product Safety Commission has linked loose connections to arcing faults, a leading cause of residential electrical fires. NEC 2020 Section 406.3 does not prohibit backstabs but commercial-grade receptacles with screw-clamp back-wire connections are the recommended replacement. If you find backstabbed outlets, rewire to side terminal screws.
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