AMERICAN NATIONAL STANDARD NECA 100-2006

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A M E R I C A NN A T I O N A LS T A N D A R DNECA 100-2006xxAFyyATzzASymbols forElectrical ConstructionDrawingsPublished byNational ElectricalContractors Association

Table of ContentsForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii1.1.11.21.3Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Symbols Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Symbols Not Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Regulatory and Other Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.2.12.22.3Purpose of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Organization of this Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Alternate Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Referrences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.3.13.23.33.4Drafting Practices for Electrical Construction Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Symbol Design and Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3General Drafting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3CADD Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Electrical Construction Drawing Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Contents for Symbol Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Annex A: Alternate Fire Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45Annex B: Typical Risers, One-Line Diagrams, and Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48Annex C: Reference Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56i

1. ScopeThis publication describes graphic symbols used torepresent electrical wiring and equipment on construction 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 drawings.1.1Symbols IncludedThis standard is limited to North American symbolsfor electrical wiring and equipment.1.21.3 Regulatory and Other Requirementsa) All information in this publication is intended toconform to the National Electrical Code(ANSI/NFPA 70).b) General requirements for installing electricalproducts and systems are described in NECA 1,Standard Practices for Good Workmanship in ElectricalContracting (ANSI). Other National ElectricalInstallation Standards provide additional guidance forinstalling particular types of electrical products andsystems. A complete list of NEIS is provided inAnnex C.Symbols Not IncludedSymbols from publications of the InternationalElectrotechnical Commission (IEC) are not includedin this standard.Symbols for equipment and systems not covered bythe NEC are not included in this standard.1

2. Purpose of SymbolsSymbols are a shorthand way of showing the locations, types, and sizes or ratings of electrical wiringTable 1: Symbol 7.07.17.28.09.09.19.210.011.011.111.212.013.014.0 2DescrptionWiring MethodsRaceways—IndicatorsRaceways—Boxes and BuswaysLuminaire (Lighting Fixtures)Luminaire Fixtures—Basic ModifiersMountingLuminaire Fixtures—Basic ModifiersOrientationLuminaire Fixtures—Basic ModifiersEmergencyLuminaire Fixtures—Extended FixturesOutlets and ReceptaclesSwitches and SensorsMotors—ControlsMotorized & HVAC EquipmentSecurityFire Alarm Communications & PanelsFire Alarm IndicatorsFire Alarm SensorsDistribution �Audio/VisualCommunications—EquipmentSite WorkSchematic Fault Circuit Interrupter,Personal ProtectionOne-Line Diagram Symbols—Switchboard MetersSchematic and One-Line sNurse Call Systemand 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 systems.2.1Organization of this StandardThis standard contains symbols commonly and primarily used on electrical construction drawings.Related 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. See Table 1 for groups.2.2Alternate Fire Safety SymbolsThe fire protection industry has developed and published symbols, not all of which are currently inwidespread use on electrical construction drawings.They are shown for reference in Annex A.2.3ReferencesThis publication does not include every knownNorth American symbol for electrical equipmentshown on construction drawings. Some older symbols 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 specialized drawings. Other drawing symbol standards andpublications are listed for reference in Annex C.

3. Drafting Practices for ElectricalConstruction Drawings3.1Symbol Design and Presentationa) The symbols in this standard are widely understood by those in the electrical design and construction field. Other symbols may also be used, providedthat a suitable explanation of their meaning isincluded on the drawing where that symbol is used,or on a symbol legend sheet.b) The orientation of a symbol on a drawing doesnot alter the meaning of the symbol.c) Every symbol making up part of an electrical circuit must begin with and end with another symbol.When 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 horizontalcircuits.d) Circuitry symbols may cross one another at anyangle.e) 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 utilization or communications equipment.f) Future circuits and future equipment should beindicated by dashed lines and clearly marked asfuture circuits or future equipment on every drawingwhere applicable.g) Luminaire symbols should be drawn wheneverpossible in their appropriate proportions, orientation, and shape. Where a luminaire symbol drawn toscale is too small to reproduce clearly, the symbolmay be enlarged to an appropriate size while maintaining proportion and orientation.3.2General Drafting Practicesa) Electrical systems should be shown on plans separate from the architectural, structural, mechanical,and other systems. For clarity, it is recommended thatthe electrical symbols be drawn darker than the background drawing showing the building structureand/or other systems.b) Different electrical systems such as power distribution, luminaire, voice/data, fire alarm, and security/access control should be shown on separate plans ifcombining them on the same drawings would reduceclarity.c) Electrical plans are generally drawn to scale.However, graphic symbols indicate only the approximate locations of electrical equipment. Providedimensions, details, elevations, and sections whereaccurate locations of outlets, lighting fixtures, andother equipment are required.d) Electrical wiring required for other systems suchas HVAC, manufacturing equipment, data processingsystems, etc, should be shown on the electrical drawings where practical, if the installation is included inthe electrical contract.3.3CADD PracticesThe following drafting practices are recommendedwhen using computer-aided design and drafting(CADD) systems to prepare electrical constructiondrawings.a) All CADD electrical construction drawings shouldbe created at full scale, (1" 1"), and should be plot3

NECA 100Symbols for Electrical Construction Drawingsted at an appropriate scale on uniform sheets of sufficient size and separate from architectural, structural, mechanical or other drawings. Within a singledrawing set, the drawing scale should be the same onas many drawings as possible.b) 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 file.c) Architectural, structural or mechanical items onthe electrical construction drawings should be plotted with lighter weight lines than the electrical items.d) 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 toachieve a desired graphic effect, create different variations of an existing block to accomplish the graphicsymbol appearance needed.e) No entities should reside on layer 0. This layer isused for referencing of blocks and blocks only.f) All entities should be placed on layers related totheir disciplines as defined by the CAD LayerGuidelines published by the American Institute ofArchitects. These include Electrical, Plumbing,HVAC, Architectural, Structural, Civil/Site,Mechanical, Process Piping, and Telecommunications/Data. The purpose of using different layers is torationally develop designs using shared drawings.Therefore, it is suggested that the AIA layer namingconvention be followed. Ordering information forCAD Layer Guidelines is shown in Annex C.3.4Electrical Construction Drawing SetA typical set of electrical construction drawingsincludes the following:a) Plan for each floor, roof, surrounding site, andother area with electrical installations.b) Site plan(s) showing incoming utility services andsubstations; exterior transformers; feeders, trunk 4lines and backbone cables between buildings; and sitelighting.c) Symbol list and abbreviation list.d) Schedule(s) of lighting fixtures, mechanicalequipment connections, transformers, etc. as appropriate. Typical schedules are shown in Annex B.e) Riser and/or one-line diagram(s) for power distribution and other systems, as appropriate. Typical risers and one-line diagrams are shown in Annex B.

Contents for Symbol Groups1.0Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.1Raceways - Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.2Raceways - Boxes and Busways . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.0Luminaire Fixtures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.1Luminaire Fixtures—Basic Modifiers—Mounting. . . . . . . . . . 112.2Luminaire Fixtures —Basic Modifiers—Orientation. . . . . . . . 112.3Luminaire Fixtures —Basic Modifiers—Emergency . . . . . . . . 122.4Luminaire Fixtures—Extended Modifiers . . . . . . . . . . . . . . . . . 123.0Outlets and Receptacles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.0Switches and Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.0Motors—Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175.1Motorized and HVAC Equipment . . . . . . . . . . . . . . . . . . . . . . . 206.0Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.0Fire Alarm Communications and Panels. . . . . . . . . . . . . . . . . . . . . . . . 237.1Fire Alarm Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257.2Fire Alarm Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268.0Power Distribution Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289.0Communications - Teledata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299.1Communications - Audio/Visual . . . . . . . . . . . . . . . . . . . . . . . . 309.2Communications - Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . 3110.0Site Work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3211.0Schematic Fault Circuit Interrupter, Personal Protection . . . . . . . . . . 3311.1 One-Line Diagram Symbols—SwitchboardMeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3611.2 Schematic and One-Line SymbolDiagrams—Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3712.0Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3913.0Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4014.0Nurse Call System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435

NECA 100Symbols for Electrical Construction Drawings1.0 RacewaysNumberPreferred SymbolDescription1.001Conduit concealed in finished areas, exposed in unfinishedareas.1.002Conduit concealed in or under floor slab.1.003Non-rigid raceway system.1.004NENormal/emergency circuit.1.005EBEmergency battery system wiring, minimum 10 AWG.1.006HTHeat trace.1.007PUnderfloor power raceway.1.008TUnderfloor telecommunications raceway.1.009PT1.010S1.011PTDUnderfloor raceway for power, telephone, and data.1.012UCPUndercarpet flat conductor cable (FCC) wiring system, power.UCTUndercarpet flat conductor cable (FCC) wiring system, telephone1.013 6Underfloor raceway for power and telecommunications.Underfloor signal raceway.

NECA 100Symbols for Electrical Construction Drawings1.1 Raceways—IndicatorsNumberPreferred SymbolDescription1.101Conduit stub. Terminate with bushing or cap if underground.1.102Conduit turning up.1.103Conduit turning down.1.104SZ 2C,4#1&1#6GND.ORSZ 53cm,4#1&1#6GND.1.105(2)SZ 2C,4#1&1#6GND.OR(2)SZ 53cm,4#1&1#6GND.1.106Indicates trade size 2” or 53 mm conduit with (4) 1 AWG and(1) 6 AWG ground.Indicates (2) trade size 2” or 53 mm conduits with (4) 1 AWGand (1) 6 AWG ground conductors in each conduit.Homerun to panelboard. Number of arrows indicates numberof circuits. (Example: Homerun to panel L211 CKTS. #1 and #3.)L211–1,31.107Flexible connection to equipment.1.108Direct connection to equipment.1.109Branch 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 U.N.O. “IG” indicates an isolated grounding conductor.IG 8

Symbols for Electrical Construction DrawingsNECA 1001.2 Raceways—Boxes and BuswaysNumberPreferred Symbol1.201DescriptionUnderfloor raceway system junction box, flush floor mounted.J1.202PPower pole with devices indicated in the specifications and onthe drawing, “P” indicates type, “2” indicates circuit.21.203T1.204TPTelecom pole with devices indicated in the specifications andon the drawings, “T” indicates type.Telecom/Power pole with devices indicated in the specificationsand on the drawings, “TP” indicates type, “2” indicates powercircuit.21.205Pull box—size as indicated or required.PB OR1.206Cabletray size as indicated.TRTRTRTRTRTRBWBWBWBusway with cable tap box, rating and type as indicated ondrawings.BWBusway with plug-in device as indicated, shown with fused disconnect.1.207Cabletray size as indicated, concealed.1.208CTB1.209BWBWF1.210Busway feeding up.1.211Busway feeding down.1.212Busway expansion joint.BW1.213Wireway, size as indicated or required.WWWWWW9

NECA 100Symbols for Electrical Construction Drawings2.0 Luminaire (Lighting Fixtures)NumberPreferred SymbolDescription2.001Luminaire: (drawn to approximate shape and toscale or large enough for clarity).2.002Luminaire strip type (length drawn to scale).2.003Fluorescent strip luminaire.2.004Fixture—double or single head spotlight.2.005Exit luminaire fixture. Arrows and exit face asindicated on drawings (mounting heights to bedetermined by job specifications).2.006Light track. Length as indicated on the drawings,with number of fixtures as indicated on drawings, and as indicated in the fixture schedule.2.007Emergency battery remote luminaire heads.2.008Emergency battery unit with luminaire heads.2.009Single luminaire pole mounted site luminairefixture.2.010Tw i n l u m i n a i r e p o l e m o u n t e d s i t e l u m i n a i r e f i x ture.2.011Roadway luminaire—cobra head.2.012Bollard type site luminaire.2.013Outdoor wallpack. 10

Symbols for Electrical Construction DrawingsNECA 1002.1 Luminaire Fixtures—Basic Modifiers MountingNumber2.100Preferred SymbolDescriptionSurface mounted fixture.Recessed fixture.Wa l l m o u n t e d f i x t u r e .Suspended, pendant, chain, stem or cable hungfixture.Pole mounted with arm.Pole mounted on top.In-ground or floor mounted. (Box around symbol.)2.2 Luminaire Fixtures—Basic Modifiers Orientation2.200A c c e n t / d i r e c t i o n a l a r r o w, w i t h o r w i t h o u t t a i l .(Drawn from photometric center in direction ofoptics or photometric orientation.)Directional aiming line. (Drawn from photometric center and may be extended to actual aimingpoint if required.)Tr a c k m o u n t e d ; l e n g t h , l u m i n a i r e t y p e s a n dq u a n t i t i e s a s s h o w n . ( Tr a c k l e n g t h d r a w n t oscale.)11

NECA 100Symbols for Electrical Construction Drawings2.3 Luminaire Fixtures—EmergencyNumberPreferred SymbolDescription2.300NOTE:Luminaire providing emergency illumination.(Filled in.)M o d i f i e r s a r e s h o w n w i t h s p e c i f i c b a s e s y m b o l s f o r c l a r i t y.Each modifier can be used with any of the base symbols.2.4 Luminaire Fixtures—Extended Modifiers2.401Aa 22.402Aa 48”NL2Standard designations for all luminaire fixtures.“A” Fixture type, refer to fixture schedule“NL” Unswitched night light“2” Circuit number“a” Switch controlMounting height.2.403Louvers.2.404Recessed, emergency fixture. 12

Symbols for Electrical Construction DrawingsNECA 1003.0 Outlets and ReceptaclesNumberPreferred Symbol3.001DescriptionFloor duplex receptacle. F flush MTD. S surfaceMTD.F3.0023.003D u p l e x c o n v e n i e n c e r e c e p t a c l e . 2 0 A 1 2 5 V.Duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.EP–2 CKT.13.0043.005Single convenience receptacle.Single convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.EP–2 CKT.33.0063.007Double duplex convenience receptacle.Double duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.EP–2 CKT.53.008Multi-outlet assembly with outlets on centers asindicated on the

“electrical” is used to include electrical, electronic, and communications systems covered by the National Electrical Code (NFPA 70). This publication also summarizes recommended drawing practices for electrical construction drawings. 1.1 Symbols Included This standard is limited to North American symbols for electrical wiring and equipment.

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