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  1. whitebear

    NEC Table 9, Effective Z?

    I thought I knew this stuff till someone at work asked me about NEC Table 9. Neglecting Xc (as explained in note 1), Z= R cos theta + X sin theta (as explained in note 2). So why when calculating Z (steel or PVC)for a #10, for example, do you come up with 3.424, not 3.6 ohms? It seems below...

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