A “loose neutral” in a residential location can cause equipment damage and even a house fire. An open neutral may start as a high-resistance connection that shows subtle signs in waveform capture data before becoming more obvious as classic opposing voltage swells and sags in the strip chart. An open or intermittent neutral is a serious problem in single-phase residential services. In a single-phase service, a 240V transformer winding includes a center tap, defined as the ...

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