2017 National Electrical Code Analysis of Changes Part 3--Four Hours of Code instruction--Resource Information NFPA 2017 NEC Standard Book, NFPA 2017 NEC Handbook, IAEI Analysis of Changes NEC 2017. All Chapter Three Changes. What is a webinar? An interactive person to person instruction for two or more attendees. Face to Face live on screen visual and audible interaction. Your computer with internet connection with web cam, speakers and microphone. You see who is addressing you, you hear the conversation, and you see the instruction materials on screen.