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2020 MODEL CODE CHANGES NEC ARTICLES 300 & 310WIRING METHODS AND MATERIALSCLASS AGENDA: This class will begin with the scope of the article, comments on the metric and trade sizes, a summary of the characteristics of the different conductor metals (principally copper and aluminum but with passing references to silver, gold, platinum, tungsten and their uses) and insulation materials (covered extensively in 310.104 (A) through (E)).The class will consist of 116 slides illustrating the code requirements first under Article 300 for the installation of the various single and multiple conductors, protection methods against physical damage (including cover requirements), continuity rules, support methods, hazards (induced currents, air plenum issues), wet and dry considerations, and splice and seal regulations. The agenda for Article 310 will cover the general requirements for the types of conductors, insulation values, mechanical strengths, wet and dry location issues, jacket types, and ampacity ratings/ deratings considering ambient temperature, conduit fill and location. The multiple tables on ampacity correction and adjustment factors will be reviewed in detail. Finally the class will examine the insulation values and composition of the different wire and cable constructions, their temperature ratings and most common applications.SAMPLES: The class will receive samples of the most common wire types like THHN, XHHW, UF, USE, Plenum and others. POWER POINT: The 116 slides will cite the Code reference, show an example to illustrate the application and then discuss the reason for the rule.LITERATURE: The attendees need to bring the 2020 NEC and will receive a wire and cable general catalogue for reference and to show the extent and variety of products used in the trade.INSTRUCTOR: The instructor is Ralph Bliquez who has been previously approved.Course Content:Article 300: Part One General Requirements300.1 Scope 300.1 (C) Metric Designations “system of preference” NEC 90.9ConductorsSingleRevision: 300.3 (B)(1)(2)(3) Same Circuit & Parallel run together and EGC requirements300.4 Physical Damage IssuesBored Holes and NotchesNMB in different applicationsRevision: (G) 4 AWG and larger Insulated fittings for protection300.5 Underground Locations Minimum Cover RequirementsRevision: 300.6 (C) Nonmetallic RequirementsTemperature and Corrosion Issues 300.6Revision: 300.7-10 Temperature Issues: Sealants identified for use with cable conductor insulation,300.11-19 Securing and Supporting Revision: 300.11 (B)(1) Testing for fire ratingSuspended ceilingsRacewaysMechanical and Electrical ContinuityRevision: 300.19 (C) Support for ConductorsBoxes and Fittings300.20-25 Raceway and Duct IssuesHysteresisCombustion and Environmental AirRevision: IT Equipment follow 645.5 (E)New Article: 300.25 Stair TowersPart II: Requirements for Over 1000 Volts300.31-50Revision: 300.45 Danger SignsArticle 310 Conductors for General WiringPart I: General310.1 Scope Revision: “up to and including 2000 volts”310.3 ConductorsRevision: minimum gauge 14 copper or 12 aluminumPart II: Construction Specifications310.4-9 Conductor Construction & ApplicationsRevision: Insulated Conductors shall Comply with Table 310.4 (A) & (B)310.8 (A) Revision: Chapter 9, Table 8 “SI” Units; (B) Conductors whose surface markings shall be durable Part III Installation310.10-21 Requirements and Tables310.10 (G) (1-4) Revisions: Conductors in Parallel310.12 (A-D) New Articles: Single Phase Dwelling Services and Feeders, New Table310.15-21 Ampacity Tables: GeneralNew Articles: 310.15 (A,B,C,D,E,F) Ampacity Tables, Temperature Correction Factors (Rooftop), Adjustment Factors for more than 3 conductors, raceway spacing and Neutral conductor as current carrying.New Articles: 310.16-21 New Ampacity tables under conditions of raceway, cable, direct burial or free air. Course Objectives: The course will present electricians with the requirements for safe wiring practices in raceways and supporting devices and the importance of ambient conditions in ampacities, insulating materials and raceway locations.Learning Outcomes: After this class, electricians should have a working knowledge of conductor types, their installation requirements considering location, temperature, insulation and ampacities. In addition, they should understand requirements for the proper installation of raceways and factors that can affect the safety and integrity of wire and cable.COURSE DOCUMENTATIONAttendees of the 4-hour class will have continuing educations credits (CC 2020 Model Code) submitted to the State of Oregon within 10 working days.Attendees will also receive a Certificate of Completion by email within the same 10-day period.A roster of attendees will be kept for at least 3 years after the class. ................
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