American Electricians' Handbook, Sixteenth Edition
Wilford I. Summersis an electrical consultant and former Executive Director of the International Association of Electrical Inspectors.Frederic P. Hartwella working electrician, is President of Hartwell Electrical Services, Inc. He has been certified by the International Association of Electrical Inspectors as a Certified Master Electrical Inspector. Mr. Hartwell is the senior member of NEC CMP 9. He is co-author ofMcGraw Hill's National Electrical Code Handbook, 27th Edition.