Transcription
UNIFORMELECTRICALWIRING GUIDERECOMMENDATIONSRELATING TOELECTRICAL INSTALLATIONSFOR HOMES ANDOTHER SITUATIONSi
This edition of the Uniform Wiring Guide is dedicated to the memory of the late Roger Bessinger, who lost his battlewith cancer on January 8, 2010. For thirty years, Roger dedicated his life, knowledge, and talents to Warren RECCand its members.As a certified energy advisor, Roger spent his career educating people about ways to use electricity wisely, efficiently, and safely. However, Roger’s abilities shined the brightest when he stood in front of school children with his“traveling electric show.” Using hands-on demonstrations, Roger taught thousands of children how electricity is generated, as well as stressing the importance of electrical safety.Roger was truly an “educator,” who shared his vast knowledge of electricity with countless groups over the years.However, Roger’s greatest satisfaction came in knowing that he made a lasting impression on children when, yearslater as adults, they would approach him and say, “I remember when you came to my school, and now you areteaching my child about electricity.”“Our death is not an end if we can live on in our children and the younger generation.” Albert Einsteinii
It is recommended that the local power supplier be contacted forinformation regarding local policies and procedures concerningelectrical wiring in their service area prior to performing anyelectrical work.This Uniform Electrical Wiring Guide has been distributed inthe past by these local power suppliers.Big Sandy RECCBlue Grass ECCClark Energy CooperativeCumberland Valley ElectricFarmers RECCFleming-Mason EnergyFranklin Electric Plant BoardGrayson RECCHickman-Fulton Counties RECCInter-County RECCJackson Energy CooperativeJackson PurchaseKenergy Corp.Licking Valley RECCMeade County RECCNolin RECCOwen ECPennyrile RECCSalt River ElectricShelby ECSouth Kentucky RECCTaylor County RECCTri-County EMCWarren RECCWest Kentucky RECCPaintsville, KYNicholasville, KYWinchester, KYGray, KYGlasgow, KYFlemingsburg, KYFranklin, KYGrayson, KYHickman, KYDanville, KYMcKee, KYPaducah, KYHenderson, KYWest Liberty, KYBrandenburg, KYElizabethtown, KYOwenton, KYHopkinsville, KYBardstown, KYShelbyville, KYSomerset, KYCampbellsville, KYLafayette, TNBowling Green, KYMayfield, 21Franklin, KYHenderson, KYHopkinsville, KYSomerset, KYBowling Green, 270-842-6541Revision Committee:Franklin Electric Plant BoardKenergy Corp.Pennyrile RECCSouth KY RECCWarren RECCiii
UNIFORM ELECTRICALWIRING GUIDE2011 EDITIONThis guide is intended to clarify and supplement that portion of theNational Electrical Code (NFPA 70-2011) used by most homeownersand contractors. The information contained herein does not preempt any federal, state or local codes, including the National Electrical Code, NFPA 70-2011. The 2011 Uniform Wiring Guide is preceded by more than 45 years of development and change.The Kentucky General Assembly (KGA) has enacted revisions to the Kentucky RevisedStatutes (KRS), two (2) of which are identified here.KRS - 198B: enacted in the 1978 Session of the Kentucky General Assembly (KGA) which inpart requires electrical inspections of new electrical facilities and prohibits electric utilities fromextending permanent electric service before the facility has been approved by the AuthorityHaving Jurisdiction (AHJ), a State Certified Electrical Inspector, or others having statutoryauthority.KRS 211-350: Enacted in the 1998 Session of the KGA prohibits the delivery of electricalpower to dwellings, MANUFACTURED homes, buildings or other structures withsewage waste fixtures, without a county health department issued “on-site” sewagedisposal permit prior to inspection by a State Certified Electrical Inspector. This statuteaffects extending temporary and permanent electrical power. This statute shall notapply to structures connected to a sewage waste disposal system approved by theNational Resources and Environmental Protection Cabinet.The KGA will adopt the National Electrical Code, NFPA 70-2011, as a part of the KentuckyBuilding Code. All electrical projects started before the adopted date, will be inspected inaccordance with the 2008 NEC. Any electrical projects started after the adopted date, will beinspected in accordance with the 2011 NEC. The Code’s purpose is the practical safeguardingof persons and property from electrical hazards.We recommend all personnel installing and maintaining electrical systems receive safetytraining on the hazards involved. (See NFPA 70E-2009.)iv
Table of ContentsSection Page1.General . (NEC Art. 90)12.Definitions of Terms . (NEC Art. 100)43.Services . (NEC Arts. 230, 408 and 590)134.Grounding Specifications . (NEC Art. 250)235.House Moving & Structural Damage .316.Branch Circuit Wiring.(NEC Arts. 210 and 220)327.Installation Procedures . (NEC Art. 300)468.Sizing Boxes, Raceway Fill . (Chap. 9) (NEC Art. 314)509.Range Wiring .(NEC Arts. 220 and 422)5710. Water Heater Wiring . (NEC Art. 422)5811. Clothes Dryer Wiring . (NEC Arts. 422, 220 and 250)5812. Fixed Motor Driven Equipment .(NEC Arts. 430 and 440)5913. Individual Room Heating and Cooling .(NEC Arts. 424 and 440)6014. Central Heating and Air Conditioning . (NEC Art. 440)6415. Manufactured Homes . (NEC Art. 550)6916. Customers’ Outside Wiring . (NEC Arts. 225, 300 and 310)8017. Swimming Pools, Hot Tubs, Spas . (NEC Art. 680)8718. Naturally and Artificially Made Bodies of Water . (NEC Art. 682)9519. Agricultural Buildings . (NEC Art. 547)9620. Optional Standby Generator Installations. (NEC Art. 702)10021. Renewable Energy .(NEC Art. 690 and 694)10422. Corrections and Errata Sheet .106v
Diagrams and TablesDesignationPageTable 3Diagram 3-ADiagram 3-BDiagram 3-CDiagram 3-DDiagram 3-ETable 4-ATable 4-BDiagram 4-ADiagram 4-BDiagram 4-CDiagram 4-DDiagram 6-ADiagram 6-BDiagram 6-DDiagram 6-EDiagram 6-FDiagram 6-GDiagram 6-HTable 8-ATable 8-BTable 8-CTable 8-DTable 8-ETable 8-FTable 14-ATable 14-BTable 14-CDiagram 14-ADiagram 15-ADiagram 15-BDiagram 15-CDiagram 15-DDiagram 15-EDiagram 15-FTable 16-BTable 16-CTable 16-DTable 16-EDiagram 16-ADiagram 17-ADiagram 17-BDiagram 19-ADiagram 20-ADiagram 20 BDiagram 20 CDiagram 21-AService Entrance Conductor Size . 14Temporary Service Guide . 18Service—Below Roof Type . 19Service—Above Roof . 20Service—Underground. 21Electric Meter Keep Clear Area .22Grounding Electrode Conductor . 26Size of Equipment Grounding Conductor . 26Concrete Encased Electrode . 27Service Bonding and Grounding . 28Grounding and Bonding at Main and Sub Panelboards . 29Bonding Connections to Metallic Boxes, Fixtures and Devices . 30Receptacle Spacing . 38Kitchen Counter Receptacles . 39Split-Wired Receptacles . 41125/250 Multiwire Branch Circuits . 42Switch Loops . 43Light Fixtures in Closets . 44Recessed Lights . 45Volume of Free Space Within Box Per Conductor . 52Metal Boxes . 53Ampacity of Conductors in Raceway, Cable or Direct Burial . 54Reduction for More than Three Conductors in Conduit . 54Maximum Number of Conductors Allowed in Conduit or Tubing. 55Maximum Number of Conductors Allowed in Conduit or Tubing. 56Furnace Wiring . 66Wire Size for Air Conditioners . 66Fuse Sizes for Single Phase Motors and Circuits . 67Protection for Air Conditioners . 68Service Terminations for Manufactured Homes Plug-ln. 74Service Terminations for Manufactured Homes, Direct Wired to Pole . 75Underground Pedestal—Manufactured Homes, Direct Wired to Pedestal . 76Manufactured Home Fixed Wiring—Under Chassis . 77Modular Home—Service on Home . 78Kentucky Manufactured Home Compliance Standards . 79Voltage Drop 125-V Copper Conductor. 82Voltage Drop 240-V Copper Conductor. 83Ampacities of Outdoor Quadruplex . 84Outdoor Overhead Supply Conductor .85Meter Pole Installations . 86Swimming Pool Bonding . 93Swimming Pool submersed lighting Installation . 94Animal Confinement Areas . 99Typical Transfer Switch .101Typical Transfer Switch (Non separately derived system) .102Typical Transfer Switch (Separately derived system) . 103Renewable Energy .105vi
GENERAL(NEC Article 90)LEGAL AUTHORITY: Electrical wiring in the State of Kentucky shall beperformed in compliance with the current National Electrical Code (NFPA-70) asadopted by the Kentucky General Assembly, and other local, state and nationalcodes or policies. All electrical installations or alterations SHALL be inspected bya Kentucky State Certified Electrical Inspector, the Authority Having Jurisdiction(AHJ).LEGAL DISCLAIMER: This 2011 edition of the Uniform Electrical Wiring Guide(UEWG) provides information “AS IS” and without warranty of any kind, eitherimplied or expressed. The information in this UEWG may contain technicalinaccuracies, typographical or diagram errors. The Electric Utilities listed hereinassume NO responsibilities or liability for damages incurred directly or indirectlyas a result of any errors, omissions or discrepancies. The Legal Authorities areresponsible for authorizing the energizing of any and all electricalinstallations They deem “IN GOOD ORDER” in the State of Kentucky.1-1POWER SUPPLIER REQUIREMENTS:A.THE ELECTRICAL CONTRACTOR SHALL CONTACT THE LOCAL POWERSUPPLIER FOR INFORMATION regarding local policies and proceduresconcerning electrical wiring in their service area.B.POWER SUPPLIER shall determine all kWh meter and service drop locations,including temporary service. Alternate locations may incur additional costs to thecustomer.C.ON-SITE HEALTH PERMITS: See Section 1-6 through 1-8 relating to on-sitehealth department permits prior to electrical inspections.D.CALL BEFORE YOU DIG: Always dial 811 (Before You Dig) to begin theprocess of getting all underground utility lines marked. It is a free servicerequired by law to help protect workers from injury and/or expense and penaltiesassociated with damaging underground lines.NOTE: ALL UNDERLINED ITEMS ARE CHANGES FOR THIS UEWG.1
GENERAL (continued)1-2PURPOSE:A.THE MAIN PURPOSE OF THIS GUIDE is to promote the practical safeguardingof persons from electrical hazards. Hazards may occur from overloaded circuits,undersized circuit conductors, oversized breakers or fuses, inadequatemechanical protection of conductors, overfilled outlet boxes and conduit, lack ofproper ventilation around recessed light fixtures, blocked heating equipment andseveral other situations of which an untrained person may be unaware. Thearticles, diagrams and tables of this guide can aid the electrician in properly sizingconductors, circuit protection devices, conduit, outlet boxes and equipment.B.THIS GUIDE IS PROVIDED TO AID in proper wiring methods and not topreempt the National Electrical Code, which contains the provisions for theAuthority Having Jurisdiction by which to inspect.1-3MANDATORY AND ADVISORY RULES: Mandatory rules of this guide arecharacterized by the use of the word “shall.” Advisory rules are characterized by the useof the word “should,” or are stated as recommendations of that which is advised but notrequired.1-4MECHANICAL EXECUTION OF WORK: Electrical equipment shall be installed in aneat, workmanlike manner and all unnecessary and complicated wiring avoided wherepracticable. Conductors, raceways, and equipment shall be firmly secured in place andattached to fittings.1-5APPROVED EQUIPMENT: All electrical equipment shall be approved and installed, inaccordance with instructions furnished by the manufacturer and/or listing and labeling.1-6TEMPORARY SERVICE: Check with your power supplier on policies applicable toconstruction, installation and inspections. On-site health department permit shall be inplace at this time. ( See Definition 2-20 and Diagram 3-A.)Note: Contact power supplier for their specifications and temporary servicelocations.1-7ROUGH-IN INSPECTION REQUIREMENTS (See Definition 2-20): Before rough-ininspection, all wiring shall be completed and ready for devices.-The main service equipment shall be bonded to the incoming metallic cold water line-The neutral bars bonded to the panelboard cabinet by an approved method(bonding screw, etc.).-Service mast through-the-wall bolts, if required, shall be installed.-Recessed lighting fixtures shall be in place and protected from insulation unless ICprotected. (Diagram 6-H.)-All cables shall be strapped.2
GENERAL (continued)-All electrical connections shall be made-up. (Exceptions: receptacles, fixtures andpermanently installed utilization equipment.)-All electrical wiring shall be exposed and accessible.-Insulation shall not be installed in the walls before the rough-in inspection is completed.1-8FINAL INSPECTION REQUIREMENTS (See Definition 2-20): All devices, wiring, andelectrical utilization equipment intended to be permanently installed shall be in place andelectrical connections completed. All circuits shall be labeled properly. On-site healthdepartment permit shall be in place at this time.1-9ELECTRICAL INSPECTION REQUIREMENTS: All electrical installations of new,additional or altered wiring requires an electrical inspection by a state certifiedelectrical inspector. (See Definition 2-20)3
2. DEFINITIONS OF TERMS(NEC Article 100)2-1ACCESSIBLE: (As applied to equipment) Admitting close approach; not guarded bylocked doors, elevation, or other effective means.2-2ACCESSIBLE: (As applied to wiring methods) Capable of being removed or exposedwithout damaging the building structure or finish, or not permanently closed in by thestructure or finish of the building.2-3ACCESSIBLE, READILY: (Readily Accessible) Capable of being reached quickly foroperation, renewal, or inspections, without requiring one to climb over, removeobstacles or to resort to portable ladders, chairs, etc.2-4AMPACITY: Current-carrying capacity of electric conductors expressed in amperes.2-5APPLIANCE: An appliance is utilization equipment, generally other than industrial,normally built in standardized sizes or types. An appliance is installed or connected asa unit to perform one or more functions, such as clothes washing, air conditioning, foodmixing, deep frying, etc.A. FIXED (fastened in place): An appliance which is fastened, or otherwise secured,at a specific location.B. TABLE (cord and plug): An appliance which is actually moved, or can be easilymoved, from one place to another in normal use.C. STATIONARY: An appliance which is not easily moved from one place to anotherin normal use.2-6APPROVED: Acceptable to the Authority Having Jurisdiction (AHJ).2-7ARC-FAULT CIRCUIT INTERRUPTER (AFCI): A circuit interruption technology whichoffers protection beyond the standard circuit breaker, intended to recognizecharacteristics unique to arcing, and de-energizing the circuit it is protecting when anarc-fault is detected.2-8AUTOMATIC: Automatic means self-acting, operating by its own mechanism whenactuated by some impersonal influence. (For example, a change in current strength,temperature, or mechanical configuration.)2-9AUTHORITY HAVING JURISDICTION (AHJ): The organization office or individualresponsible for approving equipment, materials, and installation or procedure. The AHJmay be federal, state, or local authority having statutory authority for such approval.This authority could be a state certified or licensed electrical inspector, state or countybuilding inspector, etc.4
DEFINITIONS OF TERMS (continued)2-10BATHROOM: A bathroom is defined as any area including a basin with one or more ofthe following: toilet, tub or shower.2-11BONDING (BONDED): The permanent joining of metallic parts to form an electricallyconductive path that will assure electrical continuity and conductivity with the capacityto conduct safely any current likely to be imposed.2-12BONDING JUMPER: A reliable conductor installed to ensure the required electricalconductivity between metal parts required to be electrically connected.2-13BRANCH CIRCUIT: That portion of a wiring system between the final over-currentdevice protecting the circuit and the outlet. A device not approved for branch circuitprotection such as a thermal cutout or motor overload protective device is notconsidered as the overcurrent device protecting the circuit.2-14BRANCH CIRCUIT-- APPLIANCE: A circuit supplying energy to one or more outlets towhich appliances are to be connected; such circuits are to have no permanentlyconnected lighting fixtures which are not a part of an appliance.2
Cumberland Valley Electric Gray, KY 606-528-2677 Farmers RECC Glasgow, KY 270-651-2191 Fleming-Mason Energy Flemingsburg, KY 606-845-2661 Franklin Electric Plant Board Franklin, KY 270-586-4441 Grayson RECC Grayson, KY 606-474-5136 Hickman-Fulton Counties RECC Hickman, KY 270-236-2521 Int
