Identifying reverse polarity in a standard household electrical outlet requires using a relatively inexpensive plug-in circuit analyzer or GFCI outlet tester, which features a combination of indicator lights that instantly illuminate to reveal wiring errors. If the tester lights show an open neutral or swapped hot/neutral configuration, reverse polarity is present. In automotive or DC electrical systems, reverse polarity is typically detected when equipment fails to power on, sparks fly upon connection, or digital multimeters read negative voltage values.
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