AMERICAN NATIONAL STANDARD NECA 100-2006

1 Symbols forElectrical ConstructionDrawingsNECA 100-2006 Published byNational Electrical Contractors AssociationAMERICAN NATIONAL STANDARDxxAFyyATzzA inForeword .. Included .. Not Included .. and Other Requirements .. of Symbols ..2 of this STANDARD .. Safety Symbols .. Practices for Electrical Construction Drawings ..3 design and Presentation .. Drafting Practices .. Practices .. Construction Drawing Set ..4 Contents for Symbol Groups ..5 Annex A: Alternate Fire Safety Symbols ..45 Annex B: Typical Risers, One-Line Diagrams, and Schedules ..48 Annex C: Reference standards ..56 Table of Contents1nThis publication describes graphic symbols used torepresent electrical wiring and equipment on con-struction drawings. In this publication, the term electrical is used to include electrical, electronic,and communications systems covered by theNational Electrical Code (NFPA 70). This publicationalso summarizes recommended drawing practices forelectrical construction IncludedThis STANDARD is limited to North AMERICAN symbolsfor electrical wiring and Not IncludedSymbols from publications of the InternationalElectrotechnical Commission (IEC) are not includedin this for equipment and systems not covered bythe NEC are not included in this Regulatory and Other Requirementsa) All information in this publication is intended toconform to the NATIONAL Electrical Code(ANSI/NFPA 70).

2 B) General requirements for installing electricalproducts and systems are described in NECA 1, STANDARD Practices for Good Workmanship in ElectricalContracting(ANSI). OtherNational ElectricalInstallation Standardsprovide additional guidance forinstalling particular types of electrical products complete list ofNEISis provided inAnnex Scopey a cheap license to remove are a shorthand way of showing the loca-tions, types, and sizes or ratings of electrical wiringand equipment, and the interrelationships betweenthese items. It should be emphasized that drawingsneed to be supplemented with specifications in orderto establish the details of the electrical of this StandardThis STANDARD contains symbols commonly and pri-marily used on electrical construction symbols are organized into different groups,and each symbol within a group has its own uniqueidentifying number. The group and symbol numbersare not significant except as a convenient way toidentify individual symbols.

3 See Table 1 for Fire Safety SymbolsThe fire protection industry has developed and pub-lished symbols, not all of which are currently inwidespread use on electrical construction are shown for reference in Annex publication does not include every knownNorth AMERICAN symbol for electrical equipmentshown onconstruction drawings. Some older sym-bols are either becoming obsolete over time or havebeen superseded by newer symbols (which are shownin this publication). Some electrical symbols are notwidely used on construction drawings, but usually onwiring schematics and other types of more special-ized drawings. Other drawing symbol standards andpublications are listed for reference in Annex Purpose of SymbolsTable 1: Symbol GroupsGroup Boxes and (Lighting Fixtures) Fixtures Basic Fixtures Basic Fixtures Basic Fixtures Extended and and & HVAC Alarm Communications & Alarm Alarm Wo r Fault Circuit Interrupter,Personal Diagram Symbols Switchboard and One-Line DiagramSymbols Call design and Presentationa) The symbols in this STANDARD are widely under-stood by those in the electrical design and construc-tion field.

4 Other symbols may also be used, providedthat a suitable explanation of their meaning isincluded on the drawing where that symbol is used,or on asymbol legend ) The orientation of a symbol on a drawing doesnot alter the meaning of the ) Every symbol making up part of an electrical cir-cuit must begin with and end with another a circuit continues on a different drawing, theend of the circuitry symbol must be appropriatelynoted on both drawings. This circuitry continuednotice is necessary for both vertical and ) Circuitry symbols may cross one another at ) The angle at which a circuitry symbol meetsanother symbol has no particular significance unlessotherwise noted. Circuits normally meet one anotherat a junction box, pull box, or piece of electrical uti-lization or communications ) Future circuits and future equipment should beindicated bydashed lines and clearly marked asfuture circuits or future equipment on every drawingwhere ) Luminaire symbols should be drawn wheneverpossible in their appropriate proportions, orienta-tion,and shape.

5 Where a luminaire symbol drawn toscale is too small to reproduce clearly, the symbolmay be enlarged to an appropriate size while main-taining proportion and Drafting Practicesa) Electrical systems should be shown on plans sepa-rate from the architectural, structural, mechanical,and other systems. For clarity, it is recommended thatthe electrical symbols be drawn darker than the back-ground drawing showing the building structureand/or other ) Different electrical systems such as power distrib-ut ion, luminaire, voice/data, fire alarm, and security/access control should be shown on separate plans ifcombining them on the same drawings would ) Electrical plans are generally drawn to , graphic symbols indicate only the approxi-mate locations of electrical equipment. Providedimensions, details, elevations, and sections whereaccurate locations of outlets, lighting fixtures, andother equipment are ) Electrical wiring required for other systems suchas HVAC, manufacturing equipment, data processingsystems, etc, should be shown on the electrical draw-ings where practical, if the installation is included inthe electrical PracticesThe following drafting practices are recommendedwhen using computer - aided design and drafting(CADD) systems to prepare electrical ) All CADD electrical construction drawings shouldbe created at full scale, (1" = 1"), and should be plot-3.

6 Drafting Practices for ElectricalConstruction Drawings3nn4ted at an appropriate scale on uniform sheets of suf-ficient size and separate from architectural, structur-al, mechanical or other drawings. Within a singledrawing set, the drawing scale should be the same onas many drawings as ) All electronic files should include no more thanone floor level of a building per electronic file. In nocase should two different floors of any building beincluded in one electronic ) Architectural, structural or mechanical items onthe electrical construction drawings should be plot-ted with lighter weight lines than the electrical ) Electronic files should use blocks (or cells) for allsymbology. Blocks (or cells) should use a uniformscale. Non-uniformly scaled blocks and nested blocksshould not be used. Instead of exploding blocks toac hieve a desired graphic effect, create different varia-tions of an existing block to accomplish the graphicsymbol appearance ) No entities should reside on layer 0.

7 This layer isused for referencing of blocks and blocks ) All entities should be placed on layers related totheir disciplines as defined by the CAD LayerGuidelinespublished by the AMERICAN Institute ofArchitects. These include Electrical, Plumbing,HVAC, Architectural, Structural, Civil/Site,Mechanical, Process Piping, and Telecommunica- purpose of using different layers is torationally develop designs using shared , it is suggested that the AIA layer namingconvention be followed. Ordering information forCAD Layer Guidelinesis shown in Annex Construction Drawing SetA typical set of electrical construction drawingsincludes the following:a) Plan for each floor, roof, surrounding site, andother area with electrical ) Site plan(s) showing incoming utility services andsubstations; exterior transformers; feeders, trunklines and backbone cables between buildings; and ) Symbol list and abbreviation ) Schedule(s) of lighting fixtures, mechanicalequipment connections, transformers, etc.

8 As appro-priate. Typical schedules are shown in Annex ) Riser and/or one-line diagram(s) for power distri-bution and other systems, as appropriate. Typical ris-ers and one-line diagrams are shown in Annex 100 Symbols for Electrical Construction Methods .. - Indicators.. - Boxes and Busways .. Fixtures .. Fixtures Basic Modifiers Mounting .. Fixtures Basic Modifiers Orientation .. Fixtures Basic Modifiers Emergency .. Fixtures Extended Modifiers .. and Receptacles .. and Sensors .. Controls .. and HVAC Equipment .. AlarmCommunications and Panels.. Alarm Indicators .. Alarm Sensors .. Distribution Equipment .. - Teledata .. - Audio/Visual .. - Equipment .. Work.. Fault Circuit Interrupter, Personal Protection .. Diagram Symbols Switchboard Meters .. and One-Line Symbol Diagrams Switches .. Call System .. 43 Contents for Symbol Groups5nn6 NECA 100 Symbols for Electrical Construction concealed in finished areas, exposed in concealed in or under floor raceway battery system wiring, minimum 10 power telecommunications raceway for power and signal raceway for power, telephone, and flat conductor cable (FCC) wiring system, flat conductor cable (FCC) wiring system, tele-phoneNumberPreferred stub.

9 Terminate with bushing or cap if turning turning trade size 2 or 53 mm conduit with (4) 1 AWG and(1) 6 AWG (2) trade size 2 or 53 mm conduits with (4) 1 AWGand (1) 6 AWG ground conductors in each to panelboard. Number of arrows indicates numberof circuits. (Example: Homerun to panel L211 CKTS. #1 and #3.) connection to connection to circuit, full hashes indicate ungrounded- hot (orswitch-leg) circuit conductors. Half hashes indicates groundedneutral circuit conductors. (No hashes indicates 1 hot and 1neutral.) Dots indicate grounding conductors. Equipment bondsize IG indicates an isolated grounding SymbolDescriptionNECA 100 Symbols for Electrical Construction Raceways Indicatorsn8SZ 2C,4#1&1# 53cm,4#1&1#6 GND.(2)SZ 2C,4#1&1# (2)SZ 53cm,4#1&1# 1,3 IGSymbols for Electrical Construction Drawings NECA raceway system junction box, flush floor pole with devices indicated in the specifications and onthe drawing, P indicates type, 2 indicates pole with devices indicated in the specifications andon the drawings, T indicates pole with devices indicated in the specificationsand on the drawings, TP indicates type, 2 indicates box size as indicated or size as size as indicated, with cable tap box, rating and type as indicated with plug-in device as indicated, shown with fused feeding feeding expansion , size as indicated or Raceways Boxes and BuswaysJP2 TTP2 PBORTRTRTRTRTRTRBWBWBWCTBBWBWBWFBWWWWWWW NECA 100 Symbols for Electrical Construction Luminaire (Lighting Fixtures)NumberPreferred : (drawn to approximate shape and toscale or large enough for clarity).

10 Strip type (length drawn to scale). strip double or single head luminaire fixture. Arrows and exit face asindicated on drawings (mounting heights to bedetermined by job specifications). track. Length as indicated on the drawings,with number of fixtures as indicated on draw-ings, and as indicated in the battery remote luminaire battery unit with luminaire luminaire pole mounted site luminaire pole mounted site luminaire luminaire cobra type site nSymbols for Electrical Construction Drawings NECA Luminaire Fixtures Basic Modifiers Luminaire Fixtures Basic Modifiers OrientationNumberPreferred mounted mounted , pendant, chain, stem or cable mounted with mounted on or floor mounted. (Box around sym-bol.) arrow, with or without tail.(Drawn from photometric center in direction ofoptics or photometric orientation.)Directional aiming line. (Drawn from photomet-ric center and may be extended to actual aimingpoint if required.)