Chapter 1: General: Definitions, illustrations and discussion of key terms referred to in the code. Part II: Over 1000 Volts Nominal – definitions. Part III: Hazardous Locations. Requirements for electrical installations. Article 110, Part I – V. Conductor sizing, AWG and kcmil conversion illustrations and associated tables. Terminal temperature limitations. Installation integrity and sustainability. Working space requirements and conductor spacing and distances. Enclosure selection.
Chapter 2: Use and identification of grounded conductors. Grounded system connections. Neutral conductors and their connections. Grounding vs. bonding. Means for identifying grounded conductors. Color-coding of ground and neutral conductors. Identification of grounding conductors and polarity of connections. Multiwire branch circuits disconnecting means. Line-to-Neutral loads. Identification for branch circuits. Equipment grounding conductor. Identification of ungrounded conductors. Branch-Circuit voltage limitations. GFCI’s and application of autotransformers and circuits therefrom. Branch circuit ratings. Feeder sizes and protection. Feeder and branch circuit load calculations. Grounding and bonding, with emphasis on grounding electrode conductor for alternating current systems. Dwelling and HVAC system outlets. Table 250.122, minimum ground conductor size. Equipment grounding conductors. Conductor sizing for standard breakers. Article 240, overcurrent protection.
Chapter 3: General requirements for wiring methods and materials. Conductor sizing and protection against physical damage through conduits, cable trays, busways, bus-ducts, cable bus, wire ducts and raceways with main focus on low voltage (0 to 1000V) systems. Conductor ampacity assessment. Ambient temperature and other correction factors. Conductor applications and insulation ratings. Emphasis on article 394 and Table 310.16 formerly, Table 310.15. Multiple tables renumbered and relocated. Articles deleted and new articles added. Various above ground and underground cable types.
Chapter 4: Switches, switchboards, switchgear, and panel boards. Industrial control panels. Emphasis on overload breakers and conductors sizing. Article 430, MCC’s. Y-start, delta run motors. Part III, Motor and branch circuit overload Protection. Part IV, Motor Branch-Circuit Short-Circuit and Ground-Fault Protection. Table 430.52, maximum rating or setting of motor branch-circuit short-circuit and ground-fault protective devices. Disconnecting means and the line-of-sight requirement. Article 440, HVAC and refrigeration equipment. Tables 430.250 and 430.251. Adjustable speed drive systems. Transformers and Transformer Vaults (Including Secondary Ties). Article 460, capacitors. Protection of luminaires are highlighted.
Chapter 5: Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2. Electrical hazard classification and requirements associated with flammable fluids, dust and flyings are discussed. Code relevant to protection systems in various classified areas and applications are covered. Code related to the application of short circuit protection devices, motors, and luminaires in classified locations are discussed. Distinctions and commonalities between Class, Division and Zones are explained.
Chapter 6: This chapter relates to electrical installation of special equipment. Articles related to cranes, hoists, electrical vehicles, electrolytic cells, wind electric systems, solar PV installations, fire pumps, and industrial equipment are discussed.
Chapter 7: Main focus of our discussion in this chapter is Article 706 Energy Storage Systems and 2026 updates within.
Chapter 8: General Requirements for Communications Systems. While we do not dwell on this chapter, we will mention any notable updates.
Chapter 9: A cursory review of all tables, with emphasis on Table 8 and 9, properties of conductors