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The 2017 National Electrical Estimator has a complete cross-referenced index. Find the subject you need in the left column. Then click on the subject link in the right column to jump to the costbook page.

2017 National Electrical Estimator

Subject Subject links
Copper feeder 
  bus ductCopper feeder bus duct, 600 volt, 3-wire   | Copper feeder bus duct, 600 volt, 4-wire   
  bus duct, plug-inTop of Page 352