Frederic HartwellFrederic P. Hartwell is a working electrician, President of Hartwell Electrical Services, Inc., and has been certified by the International Association of Electrical Inspectors as a Certified Master Electrical Inspector. He is the seior member of NEC CMP 9. Mr. Hartwell is coauthor of McGraw-Hill's American Electricians' Handbook, 15th Edition. Joseph F. McPartland was an electrical contracting consultant and coauthor of McGraw-Hill's National Electrical Code Handbook, 25th Edition. Brian J. McPartland is an electrical consultant and educator who teaches the nuts and bolts of the National Electrical Code(R). He is coauthor of McGraw-Hill's National Electrical Code(R) Handbook, 25th Edition. Read More Read Less