David Herres is owner and operator of a residential and commercial construction company. He is author of 2011 National Electrical Code Chapter-by-Chapter, Troubleshooting and Repairing Commercial Electrical Equipment and The Electrician's Trade Demystified. He holds a New Hampshire Electrician's License and has worked as an electrician, journalist, plumber, carpenter and constructor. Herres has written frequently for ELEVATOR WORLD and for such publications as Electrical Construction and Maintenance, Cabling Business Magazine, Electrical Contracting Products, Electrical Business and Engineering News Record since 2006. He holds a BA in English Literature and Composition from Hobart College of Geneva, New York, but has focused exclusively on electrical work in New Hampshire since 2000.