Understanding the 25-Foot Secondary Conductor Rule in the 2023 NEC Understanding the 25-Foot Secondary Conductor Rule in the 2023 NEC: Section 240.21(C)(6) The 25-foot secondary conductor rule, outlined in 240.21(C)(6) of the 2023 National Electrical Code (NEC), allows transformer secondary …
How Are Electrical Transformers Constructed? Transformer Construction The windings of industrial electrical transformers are not placed on separate legs (as shown in Figure 11-1). A more efficient method, which reduces flux leakage, is to place the windings on top of one …