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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
Underground service 
  meter socket & main breakerTop of Page 317  
  meter socketsNEMA 3R 120/240 volt meter-breaker combination, overhead/underground service with main breaker, surface or semi-flush, add for branch breakers