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Studying The NEC

Studying The NEC . Part I Getting to Know the Basics. NEC CODE 2005. • Table of Contents • Chapters 1 through 9 (major categories) • Articles 90 through 830 (individual subjects) • Parts (divisions of an Article) • Sections and Subsections • Exc eptions ( Code permissions)

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Studying The NEC

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  1. Studying The NEC Part I Getting to Know the Basics

  2. NEC CODE 2005 • Table of Contents • Chapters 1 through 9 (major categories) • Articles 90 through 830 (individual subjects) • Parts (divisions of an Article) • Sections and Subsections • Exceptions (Code permissions) • Fine Print Notes (explanatory material) Tables (Code requirements) • Index • Annexes (information)

  3. 1.Table of Contents. “The Table of Contents displays the layoutof the Chapters, Articles, and Parts as well as the page numbers. It’s an excellent resource and should be referred to periodically to observe the interrelationship of the various NEC components.When attempting to locate the rules for a partic-ular situation, knowledgeable Code users often go first to the Table of Contents to quickly find the specific NEC section that applies.”Mike Holts, NEC Index 2005

  4. 2. Chapters. There are nine Chapters, each of which is divided into Articles. The Articles fall into one of four groupings: General Requirements (Chapters 1 through 4), Specific Requirements (Chapters 5 through 7), Communications Systems(Chapter 8), and Tables (Chapter 9). • Chapter 1 – General • Chapter 2 - Wiring and Protection (2 defend and Protect) • Chapter 3 - Wiring Methods and Materials (M&M’s) • Chapter 4 - Equipment for General Use • Chapter 5 - Special Occupancies • Chapter 6 - Special Equipment • Chapter 7 - Special Conditions • Chapter 8 - Communications Systems (Telephone,Data, Satellite, and Cable TV) • Chapter 9 Tables—Conductor and Raceway Specifications General General Specific Specific

  5. 2. Chapters. There are nine Chapters, each of which is divided into Articles. The Articles fall into one of four groupings: General Requirements (Chapters 1 through 4), Specific Requirements (Chapters 5 through 7), Communications Systems(Chapter 8),and Tables (Chapter 9). • Chapter 1 - General • Chapter 2 - Wiring and Protection • Chapter 3 - Wiring Methods and Materials • Chapter 4 - Equipment for General Use • Chapter 5 - Special Occupancies • Chapter 6 - Special Equipment • Chapter 7 - Special Conditions • Chapter 8 - Communications Systems (Telephone,Data, Satellite, and Cable TV) • Chapter 9 Tables—Conductor and Raceway Specifications General Specific

  6. 3. Articles. The NEC contains approximately 140 Articles,each of which covers a specific subject. For example: • Article 110 General Requirements • Article 250 Grounding • Article 300 Wiring Methods • Article 430 Motors • Article 550 Mobile Homes, Manufactured Homes, and Mobile Home Parks. • Article 680 Swimming Pools, Spas, Hot Tubs,and Fountains • Article 725 Remote-Control, Signaling, and Power-Limited Circuits • Article 800 Communications Systems

  7. 4. Parts. Larger Articles are subdivided into Parts. Forexample, Article 110 has been divided into multipleparts: Part I. General (Sections 110.1—110.23) Part II. 600 Volts, Nominal, or Less (110.26—110.27) Part III.Over600 Volts, Nominal (110.30—110.59)

  8. 5. Sections Sections: Each NEC rule is called a Code Section. A Code Section may be broken down into subsections by letters in parentheses (A), (B), etc. Numbers in parentheses (1),(2), etc., may further break down a subsection, and lowercase letters (a), (b), etc., further breaks the rule down to the third level. For example, the rule requiring all receptacles in a dwelling unit bathroom to be GFCI protected is contained in Section 210.8(A)(1). Section 210.8(A)(1) is located in Chapter 2, Article 210, Section 8, subsection. Many in the industry incorrectly use the term “Article” when referring to a Code Section. For example, they say “Article 210.8,” when they should say “Section 210.8.” Sections come after the DOT.

  9. ChapterArticlePART.Sections, Subsections,Excp, fpn Tables Annexes Index

  10. Article 90

  11. IntroductionAnd ground rules

  12. Chapter 1

  13. Information and Rules for Electrical Installations GENERAL

  14. Article 100

  15. Definitions Part I. General Part II. Over 600 Volts

  16. Article 110

  17. Requirements for

  18. Requirements for Electrical Installations • General • 600 Volts, Nominal, or Less • Over 600 Volts, Nominal • Tunnel Installations over 600 Volts Nominal • Manholes and Other Electric Enclosures Intended for Personal Entry, All Voltages

  19. Chapter 2

  20. W and P

  21. Wiring and Protection

  22. 200210215220225230240250280285

  23. 200 210 215 220 225 230240 250280 285 Fifteen and Feed begin with “F” Neu BC FEED BC,F,S calcs Outside BC,F Serv Overcur G&B Surg TVSS’s The Historical Person of Jesus started his ministry when He was 30. He came to SERVE.

  24. 200 210 215 220 225 230 240 250 280 285 • Use and Identification of Grounded (Neutral) Conductors • Branch Circuits • Feeders • Branch-Circuit, Feeder, and Service Calculations • OutsideBranch Circuit and Feeders • Services • Overcurrent Protection • Grounding and Bonding • Surge Arrestors • TVSS’s (Transient Voltage Surge Suppressors)

  25. Chapter 3

  26. Wiring m&m’s Articles 300-398 0 0 m Got m&ms?

  27. 358 – EMT: Electrical Metallic Tubing 360 – FMT: Flexible Metallic Tubing 362 – ENT:Electrical Nonmetallic Tubing 366 – Auxiliary Gutters 368 - Busways 370 – Cable Bus 372 – Cellular Concrete Floor Raceways 374 – Cellular Metal Floor Raceways 376 – Metal Wireways 378 - Nonmetallic Wireways 380 – Multioutlet Assembly 382 – Nonmetallic Extensions 384 – Strut-Type Channel Raceways 386 – Surface Metal Raceways 388 – Surface Nonmetallic Raceways 390 – Underfloor Raceways 392 – Cable Trays 394 – Concealed Knob-and-Tube Wiring 396 – Messanger Support Wiring 398 - Open Wiring on Insulators 300 –Wiring Methods 310 – Conductors for General Wiring 312 – Cabinets, Cutout Boxes,MS Enclosures 314 – Outlet,Device,Pull & Junction Boxes Conduit Bodies,Fittings,Hand hole 320 – AC: Armored Cable 322 – FC: Flat Cable 324 – FCC: Flat Conductor Cable 326 – IGS: Integrated Gas Spacer 328 – MV: Medium Voltage Cable 330 – MC:Metal-Clad Cable 332 – MI: Mineral-Insulated, Metal-Sheathed 334 – NM,NMC,NMS: Nonmetallic-Sheathed 336 – TC:Power and Control Tray Cable 338 – SE,USE: Service Entrance Cable 340 – UF: Underground Feeder & Branch Cir 342 – IMC: Intermediate Metal Conduit 344 – RMC: Rigid Metal Conduit 348 – FMC: Flexible Metal Conduit 350 – LFMC: Liquidtight FM Conduit 352 – RNC: Rigid Nonmetallic Conduit 353 – HDPE: High Density Poly Conduit 354 – NUCC: Nonmetallic Underground Conduit 356 – LFNC: Liquidtight Nonmetallic Conduit Wiring methods and materials

  28. Chapter 4

  29. Articles 400-490 Equipment for General Use Chords, Fixture Wires, Switches, Receptacles, Plugs, Switch and Panel boards, Lamps and Lights, Appliances, Space Heaters, Motors, AC and Frig, Generators,Transformers, Converters,Capacitors, Resistors, Batteries, etc. The Stuff you USEevery day!

  30. 427 - Pipe 430 - Motors 440 – AC and FRIG 445 - Gen 450 - X 455 -Phase 460 - Cap 470 - Resist 480 - Bat 490 – Equip over 600v 400 - Flex 402 - Fix 404 - Sw 406 - Recept 408 - Sw & Pnl Bds 409 – ICP’s 410 - Lum 411 - Lts @>30v 422 - Appl 424 - Space 426 - Deicing Articles 400-490 Stuff we USE Every Day

  31. 427 - Fixed Electric Heating Equipment for Pipelines and Vessels 430 - Motors, Motor Circiuts and Controllers 440 - AC and FRIG Equipment 445 - Generators 450 - Transformers and Transformer Vaults(Including Secondary Ties) 455 - Phase Converters 460 - Capacitors 470 - Resistors and Reactors 480 - Storage Batteries 490 - Equipment over 600v Nominal 400 - Flexible chords and Cables 402 - Fixture Wires 404 - Switches 406 - Receptacles, Cord Connectors, and Attachment Plugs 408 - Switchboards and Panelboards 409 - Industrial Control Panels 410 - Luminaries (Lighting Fixtures) Lampholders, and Lamps 411 - Lighting Systems Operating at 30 Volts or Less 422 - Appliances 424 - Fixed Electric Space heating Equipment 426 - Fixed Outdoor Deicing and Snow Melting Equipment Stuff we USE Every Day

  32. Chapter 5

  33. SSSSSOOOOO! What’s Next?

  34. -500 to 590- SpecialOccupancies

  35. Hazards,Health and Other Things Generally Speaking, these rules apply to ALL Three Classes and apply always throughout ALL of Chapter 5! G D F • Class I (Flammable Gases) Division 1(proximity-very close) under normal conditions Divison2(next area or normally closed containers but abnormal conditions), Groups A-D • Class II (Combustible Dust) Division 1 (proximity-very close) under normal conditions Divison2(next area or normally closed containers but abnormal conditions), Groups E-G • Class III (Combustible Fibers) Division 1 (proximity-very close) under normal conditions Divison2(next area or normally closed containers but abnormal conditions),

  36. Groups • Class I Group Ratings are from A-D A – Acetylene B – Flammable gases, liquids and vapors mixed with air (MESG .<=40) 500.6(A)(2). Hydrogen, butadiene, ethylene oxide, propylene oxide. C- Flammable gases, liquids and vapors mixed with air (MESG .>.40, <80) 500.6(A)(3). Ethyl ether, ethylene, acetaldehyde. D - Flammable gases, liquids and vapors mixed with air (MESG >80) 500.6(A)(4). Cyclopropane, gasoline, propane, natural gas, methane, benzene, butane, and ethane. • Class II Group Ratings are from E-G E – Atmospheres containing combustible metal dust F - Atmospheres containing combustible carbonaceous dust more than 8% (ex: carbon black, charcoal, coal, or coke dust) G - Atmospheres containing combustible dusts such as flour, grain, wood, or plastic. Class III has no Groups!

  37. The Basics of Hazardous Locations • Article 500 gives the basic settings and definition for what constitutes a “hazardous location” and how they are classified. • What are dangerous flammable,combust-ible, or ignitible products and who decides it?

  38. Other Topics Covered in the Basics of Hazardous Locations of Article 500 • Protection Techniques (500.7) (A) Explosion proof (B) Dust Ignition proof (C) Dusttight (D) Purged and Pressurized (E) Intrinsic Safety (F) Nonincendive Circuit (G) Nonincendive Equipment (H) Nonincendive Component (I) Oil Immersion (J) Hermetically Sealed (K)Combustible Gas Detection System • Equipment (500.8) (A) Approval for Class and Properties (B) Markings (C) Temperature (D) Treading (E) Fiber optic Cable Assembly (Nonincendive means it will not cause something to be set on fire)

  39. 501- Class I 502 - Class II 503 – Class III 504 – Intrinsically Safe Systems 505 – Class I, Zone 0,1,and 2 Locations 506 – Zone 20,21,22 Combustible Dust, Fibers, Flyings 510 – Hazardous (Classified) Locations 511 – Commercial Garages, Repairs and Storage 513 – Aircraft Hangers 514 – Motor Fuel Dispensing 515 – Bulk Storage Plants 516 – Spray Application, Dipping and Coating Hazardous Locations (Specific Articles)

  40. The Rest of the 500 Series Articles (517-590)deal with what could be considered “hazardous” or Special Occupancies

  41. Match the picture with its Article number. • 517 • 518 • 520 • 525 • 530 • 540

  42. Here’s how they match up: • 517 – Health Care Facilities • 518 – Assembly Occupancies • 520 - Theaters • 525 - Carnivals • 530 – Motion Picture Studios • 540 – MP Projection (Film) Rooms

  43. Articles 545-590 • 545 Man • 547 Agri • 550 Mo • 551 Rec • 552 Park • 553 Flo • 555 Mar • 590 Temp

  44. Articles 545-590 • 545 Manufactured Buildings • 547 Agricultural Buildings • 550 Mobile Homes, Manufactured Homes and Parks • 551 Recreational Vehicles and RV Parks • 552 Park Trailers • 553 Floating Buildings • 555 Marinas • 590 Temporary Installations

  45. Chapter 6

  46. Special Equipment (Modification)

  47. 665 – I&DHE 668 - EC 669 - Eplate 670 - IM 675 - EDoCIM 680 – SP&F 682 - BODIES 685 - IES 690 - SPvS 692 - FuelCS 695 - FPUMPS 600 – E.S.O.L 604 – ManWirSys 605 – O.F 610 – C&H 620 - El,Dum,Esc,MW,WL,SCL 625 - EVChargSys 630 - EWelders 640 – ASP,A&R Eq 645 - IT 647 - SEE 650 - PipeO 660 – X-RE Articles 600-695 (There’s only 23)

  48. 665 – Induction and Dielectric Heating Equipment 668 – Electrolytic Cells 669 - Electroplating 670 – Industrial Machinery 675 – Electrically Driven or Controlled Irrigation Machines 680 – Swimming Pools, Fountains 682 – Natural & Artificial Bodies of Water 685 – Integrated Electrical Systems 690 – Solar Photovoltaic Systems 692 – Fuel Cell Systems 695 – Fire Pumps 600 – Electric Signs & Outline Lighting 604 – Manufactured Wiring Systems 605 – Office Furnishings 610 – Cranes and Hoists 620 - Elevators, Dumbwaiters, Escalators, Moving Walks,Wheelchair Lifts, Stairway Chair Lifts 625 – Electric Vehicle Charging Systems 630 – Electric Welders 640 – Audio Signal Processing, Amplification &Reproduction Equipment 645 – Information Technology Equipment 647 – Sensitive Electrical Equipment 650 – Pipe Organ 660 – X-Ray Equipment Articles 600-695

  49. Chapter 7

  50. Chapter 7 SPECIAL CONDITIONS

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