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3.6.9 NEC Section 240.12, SystemCoordination or Selectivity

3.24 Section Three

3.6.9

(continued)

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Overcurrent Protection 3.25

3.6.9 (Continued )

3.6.10

(continued)

3.6.10 NEC Section 240.13, Ground-Fault Protectionof Equipment on Buildings or Remote Structures

3.6.11 NEC Section 240.21, Location Requirementsfor Overcurrent Devices and Tap Conductors

3.6.11

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3.26 Section Three

3.6.11 (Continued )

(continued)

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3.6.11 (Continued)

3.6.12

3.6.12 NEC Section 240.40, DisconnectingMeans for Fuses

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3.6.13 NEC Section 240.50, PlugFuses, Fuseholders, and Adapters

3.28 Section Three

3.6.13

3.6.14

3.6.15

3.6.14 NEC Section 240.51, Edison-Base Fuses

3.6.15 NEC Section 240.53, Type S Fuses

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3.6.17 NEC Section 240.60, CartridgeFuses and Fuseholders


3.6.17

3.6.18

3.6.16

3.6.16 NEC Section 240.54, Type S Fuses,Adapters, and Fuseholders

3.6.18 NEC Section 240.61, Classificationof Fuses and Fuseholders

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3.6.19 NEC Section 240.86, Series Ratings

3.30 Section Three

3.6.19

3.6.20

3.6.20 NEC Section 240.90, Supervised IndustrialInstallations

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3.6.21 NEC Section 240.92(B), TransformerSecondary Conductors of Separately DerivedSystems (Supervised Industrial Installations Only)


3.6.21

3.6.22

3.6.23

3.6.22 NEC Section 240.92(B)(1), Short-Circuitand Ground-Fault Protection (SupervisedIndustrial Installations Only)

3.6.23 NEC Section 240.92(B)(2), OverloadProtection (Supervised Industrial Installations Only)

3.6.24

3.6.24 NEC Section 240.92(C), Outside FeederTaps (Supervised Industrial Installations Only)

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3.6.25 NEC Section 240.100, Feeder and Branch-Circuit Protection over 600 V Nominal

3.32 Section Three

3.6.25

3.6.26

3.7.1

3.7.2

3.7.3

3.6.26 NEC Section 240.100(C),Conductor Protection

3.7.1 NEC Section 250.2(D), Performanceof Fault-Current Path

3.7.2 NEC Section 250.90, Bonding Requirementsand Short-Circuit Current Rating

3.7.3 NEC Section 250.96(A), Bonding OtherEnclosures and Short-Circuit Current Requirements

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3.7.4 NEC Section 250.122, Sizing ofEquipment Grounding Conductors


3.7.4

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3.10.1 NEC Section 384.16, PanelboardOvercurrent Protection

3.8.1 NEC Section 310.10, TemperatureLimitation of Conductors

3.34 Section Three

3.8.1

3.9.1

3.10.1

3.9.1 NEC Section 364.11, Protectionat a Busway Reduction

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3.11.1

3.11.2

3.11.1 NEC Section 430.1, Scope of Motor Article

3.11.2 NEC Section 430.6, Ampacity of Conductorsfor Motor Branch Circuits and Feeders

3.11.3

3.11.3 NEC Section 430.8, Marking on Controllers

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3.36 Section Three

3.11.5

3.11.5 NEC Section 430.36, Fuses Used to ProvideOverload and Single-Phasing Protection

3.11.4 NEC Section 430.32, MotorOverload Protection

3.11.4

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3.11.6 NEC Section 430.52, Sizing of VariousOvercurrent Devices for Motor Branch-CircuitProtection


3.11.6

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3.11.7 NEC Section 430.53, Connecting SeveralMotors or Loads on One Branch Circuit

3.38 Section Three

3.11.7

3.11.8

3.11.8 NEC Section 430.71, MotorControl-Circuit Protection

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3.11.10 NEC Section 430.72(B), MotorControl-Circuit Conductor Protection


3.11.10

3.11.9

3.11.9 NEC Section 430.72(A), MotorControl-Circuit Overcurrent Protection

(continued)

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3.40 Section Three

3.11.10 (Continued )

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3.11.11 NEC Section 430.72(C), MotorControl-Circuit Transformer Protection


3.11.11

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3.11.12 NEC Section 430.94, MotorControl-Center Protection

3.42 Section Three

3.11.12

3.11.13

3.12.1

3.11.13 NEC Section 430.109(A)(6), ManualMotor Controller as a Motor Disconnect

3.12.1 NEC Section 440.5, MarkingRequirements on HVAC Controllers

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3.13.1 NEC Section 450.3, ProtectionRequirements for Transformers


3.12.2

3.13.1

3.12.2 NEC Section 440.22, Application andSelection of the Branch-Circuit Protection forHVAC Equipment

(continued)

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3.44 Section Three

3.13.1 (Continued )

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3.13.3 NEC Section 450.3(B), ProtectionRequirements for Transformers 600 V or Less


3.13.2

3.13.3

3.13.2 NEC Section 450.3(A), ProtectionRequirements for Transformers over 600 V

3.13.4 NEC Section 450.6(A)(3), Tie-Circuit Protection

3.13.4

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3.46 Section Three

3.14.1

3.15.1

3.16.1

3.14.1 NEC Section 455.7, Overcurrent ProtectionRequirements for Phase Converters

3.15.1 NEC Section 460.8(B), OvercurrentProtection of Capacitors

3.16.1 NEC Section 501.6(B), Fusesfor Class 1, Division 2 Locations

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3.17.1 NEC Section 517.17, Requirements forGround-Fault Protection and Coordination inHealth Care Facilities


3.17.1

3.18.1

3.18.1 NEC Section 520.53(F)(2), Protectionof Portable Switchboards on Stage

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3.19.1 NEC Section 550.6(B), Overcurrent ProtectionRequirements for Mobile Homes and Parks

3.48 Section Three

3.19.1

3.20.1

3.21.1

3.20.1 NEC Section 610.14(C), ConductorSizes and Protection for Cranes and Hoists

3.21.1 NEC Section 620.62, Selective Coordinationof Overcurrent Protective Devices for Elevators

(continued)

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3.22.1 NEC Section 670.3, Industrial Machinery


3.21.1 (Continued )

3.22.1

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3.23.1 NEC Section 700.5, EmergencySystems: Their Capacity and Rating

3.50 Section Three

3.23.1

3.23.2

3.23.2 NEC Section 700.16, Emergency Illumination

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3.23.3 NEC Section 700.25, Emergency SystemOvercurrent Protection Requirements (FPN)


3.23.3

3.24.1

3.24.1 NEC Section 705.16, InterconnectedElectric Power Production Sources: Interruptingand Short-Circuit Current Rating

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3.25.1 NEC Section 725.23, OvercurrentProtection for Class 1 Circuits

3.52 Section Three

3.25.1

3.26.1

3.26.1 NEC Section 760.23, Requirements forNon-Power-Limited Fire Alarm Signaling Circuits

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Table of Contents3. Overcurrent Protection3.1.0 Introduction3.1.1 NEC Section 90.2 Scope of the NEC3.2.1 NEC Section 110.3(A)(5), (6) and (8) Requirements for Equipment Selection3.2.2 NEC Section 110.3(B) Requirements for Proper Installation of Listed and Labeled Equipment3.2.3 NEC Section 110.9 Requirements for Proper Interrupting Rating of Overcurrent Protective Devices3.2.4 NEC Section 110.10 Proper Protection of System Components from Short-Circuits3.2.5 NEC Section 110.22 Proper Marking and Identification of Disconnecting Means3.3.1 NEC Section 210.20(A) Ratings of Overcurrent Devices on Branch Circuits Serving Continuous and Noncontinuous Loads3.4.1 NEC Section 215.10 Requirements for Ground-Fault Protection of Equipment on Feeders3.5.1 NEC Section 230.82 Equipment Allowed to Be Connected on the Line Side of the Service Disconnect3.5.2 NEC Section 230.95 Ground-Fault Protection for Services3.6.1 NEC Section 240.1 Scope of Article 240 on Overcurrent Protection3.6.2 NEC Section 240.3 Protection of Conductors Other than Flexible Cords and Fixture Wires3.6.3 NEC Section 240.4 Proper Protection of Fixture Wires and Flexible Cords3.6.4 NEC Section 240.6 Standard Ampere Ratings3.6.5 NEC Sections 240.8 and 380.17 Protective Devices Used in Parallel3.6.6 NEC Section 240.9 Thermal Devices3.6.7 NEC Section 240.10 Requirements for Supplementary Overcurrent Protection3.6.8 NEC Section 240.11 Definition of Current-Limiting Overcurrent Protective Devices3.6.9 NEC Section 240.12 System Coordination or Selectivity3.6.10 NEC Section 240.13 Ground-Fault Protection of Equipment on Buildings or Remote Structures3.6.11 NEC Section 240.21 Location Requirements for Overcurrent Devices and Tap Conductors3.6.12 NEC Section 240.40 Disconnecting Means for Fuses3.6.13 NEC Section 240.50 Plug Fuses, Fuseholders, and Adapters3.6.14 NEC Section 240.51 Edison-Base Fuses3.6.15 NEC Section 240.53 Type S Fuses3.6.16 NEC Section 240.54 Type S Fuses, Adapters, and Fuseholders3.6.17 NEC Section 240.60 Cartridge Fuses and Fuseholders3.6.18 NEC Section 240.61 Classification of Fuses and Fuseholders3.6.19 NEC Section 240.86 Series Ratings3.6.20 NEC Sections 240.90 and 240.91 Supervised Industrial Installations3.6.21 NEC Section 240.92(B) Transformer Secondary Conductors of Separately Derived Systems 3.6.22 NEC Section 240.92(B)(1) Short-Circuit and Ground-Fault Protection3.6.23 NEC Section 240.92(B)(2) Overload Protection3.6.24 NEC Section 240.92(C) Outside Feeder Taps3.6.25 NEC Section 240.100 Feeder and Branch-Circuit Protection over 600 V Nominal3.6.26 NEC Section 240.100(C) Conductor Protection3.7.1 NEC Section 250.2(D) Performance of Fault-Current Path3.7.2 NEC Section 250.90 Bonding Requirements and Short-Circuit Current Rating3.7.3 NEC Section 250.96(A) Bonding Other Enclosures and Short-Circuit Current Requirements3.7.4 NEC Section 250.122 Sizing of Equipment Grounding Conductors3.8.1 NEC Section 310.10 Temperature Limitation of Conductors3.9.1 NEC Section 364.11 Protection at a Busway Reduction3.10.1 NEC Section 384.16 Panelboard Overcurrent Protection3.11.1 NEC Section 430.1 Scope of Motor Article3.11.2 NEC Section 430.6 Ampacity of Conductors for Motor Branch Circuits and Feeders3.11.3 NEC Section 430.8 Marking on Controllers3.11.4 NEC Section 430.32 Motor Overload Protection3.11.5 NEC Section 430.36 Fuses Used to Provide Overload and Single-Phasing Protection3.11.6 NEC Section 430.52 Sizing of Various Overcurrent Devices for Motor Branch-Circuit Protection3.11.7 NEC Section 430.53 Connecting Several Motors or Loads on One Branch Circuit3.11.8 NEC Section 430.71 Motor Control-Circuit Protection3.11.9 NEC Section 430.72(A) Motor Control-Circuit Overcurrent Protection3.11.10 NEC Section 430.72(B) Motor Control-Circuit Conductor Protection3.11.11 NEC Section 430.72(C) Motor Control-Circuit Transformer Protection3.11.12 NEC Section 430.94 Motor Control-Center Protection3.11.13 NEC Section 430.109(A)(6) Manual Motor Controller as a Motor Disconnect3.12.1 NEC Section 440.5 Marking Requirements on HVAC Controllers3.12.2 NEC Section 440.22 Application and Selection of the Branch-Circuit Protection for HVAC Equipment3.13.1 NEC Section 450.3 Protection Requirements for Transformers3.13.2 NEC Section 450.3(A) Protection Requirements for Transformers over 600 V3.13.3 NEC Section 450.3(B) Protection Requirements for Transformers 600 V or Less3.13.4 NEC Section 450.6(A)(3) Tie-Circuit Protection3.14.1 NEC Section 455.7 Overcurrent Protection Requirements for Phase Converters3.15.1 NEC Section 460.8(B) Overcurrent Protection of Capacitors3.16.1 NEC Section 501.6(B) Fuses for Class 1, Division 2 Locations3.17.1 NEC Section 517.17 Requirements for Ground-Fault Protection and Coordination in Health Care Facilities3.18.1 NEC Section 520.53(F)(2) Protection of Portable Switchboards on Stage3.19.1 NEC Section 550.6(B) Overcurrent Protection Requirements for Mobile Homes and Parks3.20.1 NEC Section 610.14(C) Conductor Sizes and Protection for Cranes and Hoists3.21.1 NEC Section 620.62 Selective Coordination of Overcurrent Protective Devices for Elevators3.22.1 NEC Section 670.3 Industrial Machinery3.23.1 NEC Section 700.5 Emergency Systems: Their Capacity and Rating3.23.2 NEC Section 700.16 Emergency Illumination3.23.3 NEC Section 700.25 Emergency System Overcurrent Protection Requirements (FPN)3.24.1 NEC Section 705.16 Interconnected Electric Power Production Sources3.25.1 NEC Section 725.23 Overcurrent Protection for Class 1 Circuits3.26.1 NEC Section 760.23 Requirements for Non-Power-Limited Fire Alarm Signaling Circuits

Index

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