The definitions described by the older OSHA and the recent ANSI standard are.
Ansi iec electrical symbols pro#
Net W0r k Pro teet ion &.A utom at ion Guide. ANSI Standard Device Numbers & Common Acronyms Suffixes Description 1 Positive-Sequence 2 Negative-Sequence A Alarm, Auxiliary Power AC Alternating Current AN Anode B Bus, Battery, or Blower BF Breaker Failure BK Brake BL Block (Valve) BP Bypass BT Bus Tie BU Backup C Capacitor, Condenser, Compensator, Carrier Current, Case, or Compressor CA. 3 - ANSI/ISA-5.1-2009 Preface (informative) This preface is included for information purposes and is not part of ANSI/ISA-5.1-2009. ISO 7000/IEC 60417 Graphical Symbols for Use on Equipment 2725 Contains Or. The functionsaresupplementedby letterswhereamplificationof the functionis required.Theotherisgivenin IEC60617,andusesgraphicalsymbols.ToassisttheProtectionEngineerin convertingfromonesystemto theother,a selectlistofANSIdevicenumbersandtheirIECequivalentsis givenin FigureA2.1. Therearetwo methodsfor indicatingprotectionrelayfunctionsincommonuse.OneisgiveninANSIStandardC37-2, and uses a numberingsystemfor variousfunctions.
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