A new requirement for grouping parallel conductors was added. 376.20 Conductors Connected in Parallel. Where conductors are installed in parallel as permitted in 310.10(H), the parallel conductor sets must be installed in groups consisting of not more than one conductor per phase, or neutral conductor to prevent current imbalance in the paralleled conductors due to inductive reactance (Fig. 10). Analysis: The concept of grouping the ungrounded and grounded conductors of a circuit ...

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