NEMA EW4:2009

NEMA EW4:2009 Graphic Symbols For Arc Welding And Cutting Apparatus Specifies graphic symbols for arc welding and cutting equipment, including those symbols used to identify controls, indicators, connection points, operations, functions, commands, and processes.

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Table of Contents

1Scope
2References
2.1Normativereferences
2.2Informativereferences
3Termsanddefinitions
4Identificationofpartsandapplication
4.1General
4.2Procedureforparts
4.3Selectionofsymbols
4.4Sizeofsymbols
4.5Useofcolor
5Graphicsymbols
6Howtocombinegraphicsymbols
6.1General
6.2Proceduretocombinesymbols
6.3Summary
AnnexA(informative)-ExamplesofGroupingofSymbols
A.1Inputvoltage/powerswitch
A.2Useofremotereceptaclesandselectorswitches
A.3Weldstartandstoppushbuttons
A.4Panelindicatorlights
A.5Output(contactor)switch
A.6Arcforcecontrolpotentiometer
A.7TerminalsandselectorswitchonAC/DCwelder
A.8Processswitch(SMAW-GTAW-GMAW)
A.9Ignitionswitchonenginedrivenwelder
A.10Idleswitch
A.11Start/runswitch
A.12ProcessselectionforGMAW
A.13ControlpotentiometersforGMAW
A.14SwitchedsettingsforGMAW
A.15Settingpulsingparametersusingdigitaldisplay
A.16SettingpulsedGMAWparameterswithdigitaldisplay
A.17ACbalancecontrolwithbalancedpositionusedfor
theSMAWprocess

Abstract

Specifies graphic symbols for arc welding and cutting equipment, including those symbols used to identify controls, indicators, connection points, operations, functions, commands, and processes.

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