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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
Plug-in 
  breakers for bus ductTop of Page 357  
  bus ductAluminum plug-in bus duct, 600 volt, 3-phase, 4-wire, 10' length  | Aluminum plug-in bus duct, 600 volt, 3-phase, 4-wire, 10' length with integral ground bus  | Copper plug-in bus duct, 600 volt, 3-phase, 4-wire, 10'- 0" length   | Copper plug-in bus duct, 600 volt, 3-phase, 4-wire, 10'- 0" length with integral ground bus   
  combo units for bus ductTop of Page 357  
  switches for bus ductTop of Page 356