David Herres, Master Electrician, is the owner and operator of a residential and commercial construction company. He is the author of 2011 National Electrical Code Chapter-by-Chapter, Troubleshooting and Repairing Commercial Electrical Equipment, and The Electrician’s Trade Demystified. Mr. Herres has written more than 150 articles for construction and electronics magazines, including Electrical Construction and Maintenance, Cabling Business, Nuts and Volts, Solar Connection, Fine Homebuilding, and others.