SECTION 2 NEC REFERENCES SECTION 1 LOW-VOLTAGE AND POWER- LIMITED SYSTEMS...1. CHAPTER 1 GENERAL Introduction...35
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1 SECTION 1 LOW-VOLTAGE AND POWER- LIMITED SYSTEMS...1 Overview of Low-Voltage and Power-Limited Systems...3 Chapter 4 Equipment for General Use...3 Chapter 5 Special Occupancies...3 Chapter 6 Special Equipment...4 Chapter 7 Special Conditions...4 Chapter 8 Communications Systems...8 Summary of NEC Requirements for Low-Voltage Systems...13 Abandoned Cable...13 Access to Electrical Equipment...13 Burial Depth...14 Cable Marking...14 Cable Tray [392.3(A)]...15 Enclosures Not Required...15 Environmental Air Space...16 Fire-Rated Walls, Floors, and Ceilings...16 Grounding...16 Handholes...18 Listing Requirements for Cables...18 Listing Requirements for Raceways...18 Mixing Other Low-Voltage or Power-Limited Cables...18 Mixing Low-Voltage and Power-Limited Cables with Power Conductors...19 Plenum-Rated Cables...19 Plenum-Rated Raceways...19 Protection from Physical Damage...20 Raceway Not Required...20 Raceway Required...20 Raceway Used as Support...21 Raised Floor (Environmental Air Space)...21 Separation (6 ft) from Lightning Conductors...22 Separation from Power Conductors...22 Separation from Wiring Methods...22 Service Mast...22 Support of Cable...23 Suspended Ceiling (Environmental Air Space)...23 Underground Installation...24 SECTION 2 NEC REFERENCES Article 90 Introduction...27 Introduction Purpose of the NEC Scope of the NEC Code Arrangement Enforcement Mandatory Requirements and Explanatory Material Examination of Equipment for Product Safety...31 Article 90 Questions...32 CHAPTER 1 GENERAL Introduction...35 ARTICLE 100 DEFINITIONS...37 Introduction...37 Article 100 Questions...42 ARTICLE 110 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS...45 Introduction...45 PART I. GENERAL REQUIREMENTS Scope Approval of Equipment Examination, Identification, Installation, and Use of Equipment Copper Conductors Conductor Sizes Conductor Insulation Suitable Wiring Methods Deteriorating Agents Mechanical Execution of Work Mounting and Cooling of Equipment Conductor Termination Manufacturer s Markings...51 PART II. 600V, NOMINAL OR LESS Spaces About Electrical Equipment Guarding...56 Article 110 Questions...57 vi
2 Understanding Low-Voltage and Power-Limited Systems CHAPTER 2 WIRING AND PROTECTION Introduction...61 ARTICLE 250 GROUNDING AND BONDING...63 Introduction...63 PART I. GENERAL Scope Definitions General Requirements for Grounding and Bonding Termination of Grounding and Bonding Conductors Clean Surface...73 PART II. SYSTEM GROUNDING AND BONDING Systems Required to be Grounded and Bonded...73 PART III. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR Grounding Electrode System Grounding (Earthing) Electrodes Installation of Grounding Electrode System Supplementary Electrodes Resistance of Ground Rod Electrode Grounding Electrode Conductor Termination Grounding Electrode Conductor Termination Fitting...82 PART V. BONDING Grounding (Bonding) of Communications Systems...82 PART VI. EQUIPMENT GROUNDING (BONDING) AND EQUIPMENT GROUNDING (BONDING) CONDUCTORS Fixed Equipment Connected by Permanent Wiring Methods Specific...83 Article 250 Questions...84 CHAPTER 3 WIRING METHODS AND MATERIALS Introduction...89 ARTICLE 300 WIRING METHODS...91 Introduction...91 PART I. GENERAL REQUIREMENTS Scope Conductors Protection Against Physical Damage Underground Installations Protection Against Corrosion and Deterioration Raceways Exposed to Different Temperatures...96 Table of Contents Not Permitted in Raceways Electrical Continuity Securing and Supporting Mechanical Continuity Boxes or Conduit Bodies Ducts, Plenums, and Air-Handling Spaces Spread of Fire or Products of Combustion Panels Designed to Allow Access Article 300 Questions ARTICLE 314 OUTLET, DEVICE, PULL AND JUNCTION BOXES, CONDUIT BODIES, AND HANDHOLE ENCLOSURES Introduction PART I. SCOPE AND GENERAL Scope Nonmetallic Boxes Metal Boxes PART II. INSTALLATION Damp, Wet, or Hazardous (Classified) Locations Repairing Gaps Around Boxes Support of Boxes and Conduit Bodies Covers and Canopies Wiring to be Accessible Handhole Enclosures Article 314 Questions ARTICLE 336 POWER AND CONTROL TRAY CABLE (TYPE TC) Introduction PART I. GENERAL Scope Definition PART II. INSTALLATION Uses Permitted Uses Not Permitted Article 336 Questions ARTICLE 342 INTERMEDIATE METAL CONDUIT (TYPE IMC) Introduction PART I. GENERAL Scope Definition Listing Requirements vii
3 Table of Contents PART II. INSTALLATION Uses Permitted Dissimilar Metals Trade Size Number of Conductors Bends Number of Bends (360 ) Reaming Secured and Supported Couplings and Connectors Bushings Article 342 Questions ARTICLE 344 RIGID METAL CONDUIT (TYPE RMC) Introduction PART I. GENERAL Scope Definition Listing Requirements PART II. INSTALLATION Uses Permitted Dissimilar Metals Trade Size Number of Conductors Bends Number of Bends (360 ) Reaming Secured and Supported Couplings and Connectors Bushings Article 344 Questions ARTICLE 348 FLEXIBLE METAL CONDUIT (TYPE FMC) Introduction PART I. GENERAL Scope Definition Listing Requirements PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Size Number of Conductors Bends Number of Bends (360 ) Trimming Secured and Supported Understanding Low-Voltage and Power-Limited Systems Fittings Bonding Article 348 Questions ARTICLE 350 LIQUIDTIGHT FLEXIBLE METAL CONDUIT (TYPE LFMC) Introduction PART I. GENERAL Scope Definition Listing Requirement PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Size Number of Conductors Bends Number of Bends (360 ) Secured and Supported Fittings Bonding Article 350 Questions ARTICLE 352 RIGID NONMETALLIC CONDUIT (TYPE RNC) Introduction PART I. GENERAL Scope Definition PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Size Number of Conductors Bends Number of Bends (360 ) Trimming Secured and Supported Expansion Fittings Bushings Joints Grounding (Bonding) Article 352 Questions ARTICLE 353 HIGH-DENSITY POLYETHYLENE CONDUIT (TYPE HDPE) Introduction viii
4 Understanding Low-Voltage and Power-Limited Systems PART I. GENERAL Scope Definition Listing Requirements PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Size Number of Conductors Bends How Made Bends Number in One Run Trimming Bushings Joints Splices and Taps Grounding (Bonding) Article 353 Questions ARTICLE 358 ELECTRICAL METALLIC TUBING (TYPE EMT) Introduction PART I. GENERAL Scope Definition Listing Requirement PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Size Number of Conductors Bends Number of Bends (360 ) Reaming and Threading Secured and Supported Coupling and Connectors Article 358 Questions ARTICLE 362 ELECTRICAL NONMETALLIC TUBING (TYPE ENT) Introduction PART I. GENERAL Scope Definition PART II. INSTALLATION Uses Permitted Uses Not Permitted Trade Sizes Table of Contents Number of Conductors Bends Number of Bends (360 ) Trimming Secured and Supported Bushings Joints Grounding (Bonding) Article 362 Questions ARTICLE 384 STRUT-TYPE CHANNEL RACEWAYS Introduction PART I. GENERAL Scope Definition PART II. INSTALLATION Uses Permitted Uses Not Permitted Conductor Maximum Size Number of Conductors Securing and Supporting Splices and Taps Grounding (Bonding) Article 384 Questions ARTICLE 386 SURFACE METAL RACEWAYS Introduction PART I. GENERAL Scope Definition Listing Requirements PART II. INSTALLATION Uses Permitted Uses Not Permitted Size of Conductors Number of Conductors Securing and Supporting Splices and Taps Grounding (Bonding) Separate Compartments Article 386 Questions ARTICLE 388 SURFACE NONMETALLIC RACEWAYS Introduction PART I. GENERAL Scope Definition ix
5 Table of Contents Listing Requirements PART II. INSTALLATION Uses Permitted Uses Not Permitted Size of Conductors Number of Conductors Splices and Taps Grounding (Bonding) Separate Compartments Article 388 Questions ARTICLE 392 CABLE TRAYS Introduction Scope Definition Uses Permitted Uses Not Permitted Installation Grounding (Bonding) Cable Installation Article 392 Questions CHAPTER 4 EQUIPMENT FOR GENERAL USE Introduction ARTICLE 400 FLEXIBLE CORDS AND FLEXIBLE CABLES Introduction Scope Suitability Types of Flexible Cords and Flexible Cables Uses Permitted Uses Not Permitted Pull at Joints and Terminals Article 400 Questions ARTICLE 402 FIXTURE WIRES Introduction Scope Types Allowable Ampacity of Fixture Wires Minimum Size Raceway Size Uses Permitted Uses Not Permitted Article 402 Questions Understanding Low-Voltage and Power-Limited Systems ARTICLE 411 LIGHTING SYSTEMS OPERATING AT 30V OR LESS Introduction Scope Definition Listing Required Locations Not Permitted Secondary Circuits Article 411 Questions CHAPTER 5 SPECIAL OCCUPANCIES Introduction ARTICLE 500 HAZARDOUS (CLASSIFIED) LOCATIONS Introduction Scope Definitions Other Articles General Classifications of Locations Material Groups Protection Techniques Equipment Specific Occupancies Article 500 Questions ARTICLE 501 CLASS I HAZARDOUS (CLASSIFIED) LOCATIONS Introduction PART I. GENERAL Scope General PART II. WIRING Wiring Methods Conduit and Cable Seals PART III. EQUIPMENT Low-Voltage, Limited-Energy, and Communications Systems Article 501 Questions ARTICLE 502 CLASS II HAZARDOUS (CLASSIFIED) LOCATIONS Introduction PART I. GENERAL Scope General x
6 Understanding Low-Voltage and Power-Limited Systems PART II. WIRING Wiring Methods Seals PART III. EQUIPMENT Low-Voltage, Limited-Energy, and Communications Systems Article 502 Questions ARTICLE 503 CLASS III HAZARDOUS (CLASSIFIED) LOCATIONS Introduction PART I. GENERAL Scope General PART II. WIRING Wiring Methods PART III. EQUIPMENT Signaling, Alarm, Remote-Control, and Loudspeaker Systems Article 503 Questions ARTICLE 504 INTRINSICALLY SAFE SYSTEMS Introduction Scope Definitions Application of Other Articles Equipment Approval Equipment Installation Wiring Methods Separation of Intrinsically Safe Circuits Grounding (Earthing) Bonding Sealing Identification Article 504 Questions CHAPTER 6 SPECIAL EQUIPMENT Introduction ARTICLE 640 AUDIO SIGNAL PROCESSING, AMPLIFICATION, AND REPRODUCTION EQUIPMENT Introduction PART I. GENERAL Scope Definitions Locations and Other Articles Protection of Electrical Equipment Table of Contents Access to Electrical Equipment Mechanical Execution of Work Grounding (Earthing) and Bonding Wiring Methods Audio Systems Near Bodies of Water PART II. PERMANENT AUDIO SYSTEM INSTALLATIONS Use of Flexible Cords and Flexible Cables Wiring of Equipment Racks Raceway Fill Loudspeakers in Fire-Resistance-Rated Partitions, Walls, and Ceilings Article 640 Questions ARTICLE 645 INFORMATION TECHNOLOGY EQUIPMENT Introduction Scope Information Technology Equipment Room Supply Circuits and Interconnecting Cables Cables Not in Information Technology Equipment Room Penetrations Disconnecting Means Uninterruptible Power Supplies (UPS) Grounding (Bonding) Article 645 Questions ARTICLE 647 SENSITIVE ELECTRONIC EQUIPMENT Introduction Scope General Wiring Methods Grounding (Bonding) Receptacles Article 647 Questions CHAPTER 7 SPECIAL CONDITIONS Introduction ARTICLE 720 CIRCUITS AND EQUIPMENT OPERATING AT LESS THAN 50 VOLTS Introduction Article 720 Questions ARTICLE 725 CLASS 1, CLASS 2, AND CLASS 3 REMOTE-CONTROL, SIGNALING, AND POWER- LIMITED CIRCUITS Introduction xi
7 Table of Contents PART I. GENERAL Scope Definitions Other Articles Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Safety-Control Equipment Circuit Requirements PART II. CLASS 1 CIRCUIT REQUIREMENTS Class 1 Circuit Classifications and Power Source Requirements Class 1 Circuit Overcurrent Protection Class 1 Circuit Wiring Methods Conductors of Different Circuits in Same Cable, Enclosure, or Raceway Class 1 Circuit Conductors Number of Conductors in a Raceway PART III. CLASS 2 AND CLASS 3 CIRCUIT REQUIREMENTS Power Sources for Class 2 and Class 3 Circuits Equipment Marking Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source Wiring Methods on Load Side of the Class 2 or Class 3 Power Source Separation from Other Systems Conductors of Different Circuits in Same Cable, Enclosure, or Raceway Class 2 or Class 3 Cables Exposed to Lightning Support Applications of Class 2 and Class 3 Cables PART VI. LISTING REQUIREMENTS Listing and Marking of Class 2 and Class 3 Cables Article 725 Questions ARTICLE 760 FIRE ALARM SYSTEMS Introduction PART I. GENERAL Scope Definitions Other Articles Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Fire Alarm Circuit and Equipment Grounding (Bonding) Understanding Low-Voltage and Power-Limited Systems Fire Alarm Circuit Identification Fire Alarm Circuit Cables Exposed to Lightning Fire Alarm Circuit Requirements PART II. NONPOWER-LIMITED FIRE ALARM (NPLFA) CIRCUITS GFCI and AFCI Protection NPLFA Circuit Overcurrent Protection NPLFA Circuit Wiring Methods Conductors of Different Circuits in Same Cable, Enclosure, or Raceway NPLFA Circuit Conductors Number of Conductors in a Raceway PART III. POWER-LIMITED FIRE ALARM (PLFA) CIRCUITS Power Sources for PLFA Circuits Equipment Marking Wiring Methods and Materials on Load Side of the PLFA Power Source Separation from Other Circuit Conductors PLFA Circuits, Class 2, Class 3, and Communications Circuits Support Applications of Listed PLFA Cables PART IV. LISTING REQUIREMENTS Listing and Marking of NPLFA Cables Listing and Marking of PLFA Cables Article 760 Questions ARTICLE 770 OPTICAL FIBER CABLES AND RACEWAYS Introduction PART I. GENERAL Scope Definitions Locations and Other Articles Optical Fiber Cables Types Raceways for Optical Fiber Cables Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work PART III. CABLES WITHIN BUILDINGS Listing of Optical Fiber Cables Installation of Optical Fibers and Electrical Conductors Applications of Listed Optical Fiber Cables and Raceways xii
8 Understanding Low-Voltage and Power-Limited Systems PART IV. LISTING REQUIREMENTS Listing Requirements for Optical Fiber Cables Listing Requirements for Optical Fiber Raceways Article 770 Questions CHAPTER 8 COMMUNICATIONS SYSTEMS Introduction ARTICLE 800 COMMUNICATIONS CIRCUITS Introduction PART I. GENERAL Scope Definitions Other Articles Installation of Equipment Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work Overhead Communications Wires and Cables PART II. CONDUCTORS OUTSIDE AND ENTERING BUILDINGS Underground Circuits Entering Buildings Lightning Conductors PART III. PROTECTION Primary Protection Cable Grounding PART IV. GROUNDING METHODS Cable and Primary Protector Grounding PART V. COMMUNICATIONS WIRES AND CABLES WITHIN BUILDINGS Raceways for Communications Circuits Listing of Communications Wires and Cables Installation of Communications Circuits and Equipment Applications of Listed Communications Wires, Cables, and Raceways PART VI. LISTING REQUIREMENTS Communications Wires and Cables Communications Raceways Article 800 Questions ARTICLE 810 RADIO AND TELEVISION EQUIPMENT Introduction PART I. GENERAL Scope Other Articles Community Television Antenna Table of Contents PART II. RECEIVING EQUIPMENT ANTENNA SYSTEMS Support of Lead-In Cables Avoid Contact with Conductors of Other Systems Grounding Clearances Antenna Discharge Unit Grounding Conductors Article 810 Questions ARTICLE 820 COMMUNITY ANTENNA TELEVISION (CATV) AND RADIO DISTRIBUTION SYSTEMS Introduction PART I. GENERAL Scope Definitions Locations and Other Articles Energy Limitations Access to Electrical Equipment Behind Panels Designed to Allow Access Mechanical Execution of Work PART II. CABLES OUTSIDE AND ENTERING BUILDINGS Overhead Cables Underground Circuits Entering Buildings PART III. PROTECTION Grounding Cable PART IV. GROUNDING METHODS Cable Grounding PART V. CABLES WITHIN BUILDINGS Raceways for Coaxial Cables Listing and Markings Installation of Cables and Equipment Applications of Listed CATV Cables and Raceways PART VI. LISTING REQUIREMENTS Coaxial Cables CATV Raceways Article 820 Questions ARTICLE 830 NETWORK-POWERED BROADBAND COMMUNICATIONS SYSTEMS Introduction PART I. GENERAL Scope Definitions Article 830 Questions xiii
9 Table of Contents CHAPTER 9 TABLES CONDUCTOR AND RACEWAY SPECIFICATIONS Introduction Table 1 Conductor Fill Percentage Table 4 Raceway Dimensions Table 5 Conductor Cross-Sectional Area Table 8 Conductor Properties Table 9 AC Impedance for Conductors in Conduit or Tubing Understanding Low-Voltage and Power-Limited Systems ANNEX C CONDUIT AND TUBING FILL TABLES FOR CONDUCTORS AND FIXTURE WIRES OF THE SAME SIZE Introduction FINAL EXAM INDEX xiv
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