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Comparison of IEC & NEMA Schematic Diagrams Technical Focus General. With the increasing emphasis on globalisation, many industries are now looking to all parts of the world to produce, market and sell their products. Electrical manufacturers are no exception. Since the electrical standards adopted by various nations may vary, the markings and symbols used to describe electrical control products can also vary. Whether it is a complex control system on a machine tool or a simple across-the-line motor starter, the need to recognise and understand these symbols becomes more important. It is possible that products from all parts of the world are being used in any one facility. The purpose of this document is to provide a simple cross-reference of common schematic/wiring diagram symbols used throughout various parts of the world. The following tables describe the device and show the symbol by area of usage.

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Page 1: Comparison of Iec and Nema Schematic Diagrams (1)

11111EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Comparison of IEC & NEMASchematic DiagramsTechnical Focus

General.

With the increasing emphasis on globalisation, many industries are now looking to all parts of the world to produce, market and sell theirproducts. Electrical manufacturers are no exception. Since the electrical standards adopted by various nations may vary, the markings andsymbols used to describe electrical control products can also vary. Whether it is a complex control system on a machine tool or a simpleacross-the-line motor starter, the need to recognise and understand these symbols becomes more important. It is possible that products fromall parts of the world are being used in any one facility.

The purpose of this document is to provide a simple cross-reference of common schematic/wiring diagram symbols used throughout variousparts of the world.

The following tables describe the device and show the symbol by area of usage.

Page 2: Comparison of Iec and Nema Schematic Diagrams (1)

22222 EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Description NEMA IEC

Coil

Thermal-magnetic

Capacitor

CapacitorMagnetic only

Basic contactsNormally closed

Normally open

Time delay contactsNormally closed,timed closed

Normally closed,timed open

Normally opentimed closed

Normally opentimed open

Fused

Disconnect switchNon-fused

Description NEMA IEC

Fuse

Earth(Ground)

Three phase

Induction motorSingle phase

Push-to-test

Indicating lightsStandard

Meters

Insert colour codeinside symbol

Insert colour codenext to symbol

Insert colour codeinside symbol

Insert function codeinside symbol

Insert function codenext to symbol

Page 3: Comparison of Iec and Nema Schematic Diagrams (1)

33333EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Description NEMA IEC

Magnetic element

Overload relaysThermal element

Momentary (N.O.)

Mushroom head (N.C.)

Mushroom head (N.O.)

Resistor

Selector switch2 position

3 position

Float (N.O.)

SwitchesFloat (N.C.)

Description NEMA IEC

Flow (N.C.)

Flow (N.O.)

Foot (N.O.)

Foot (N.C.)

Limit (N.O.)

Limit (N.C.)

Momentary (N.C.)

PushbuttonsIlluminated

Description NEMA IEC

Page 4: Comparison of Iec and Nema Schematic Diagrams (1)

44444 EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Description NEMA IEC

Pressure (N.O.)

SwitchesPressure (N.C.)

Temperature (N.O.)

SwitchesTemperature (N.C.)

Description NEMA IEC

Voltage

TransformerCurrent

Description NEMA IEC

Common Schematic diagrams Across the line non-reversing starters with Start - Stop pushbuttons

NEMA IEC

Power circuit

Control circuit

Page 5: Comparison of Iec and Nema Schematic Diagrams (1)

55555EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Common Schematic diagrams Across the line non-reversing starters with Hand - Off - Auto selector switch

NEMA IEC

Power circuit

Control circuit

Page 6: Comparison of Iec and Nema Schematic Diagrams (1)

66666 EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Common Schematic diagrams Across the line reversing starters with Forward - Reverse - Stop pushbuttons

NEMA IEC

Power circuit

Control circuit

Page 7: Comparison of Iec and Nema Schematic Diagrams (1)

77777EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Common Schematic diagrams Combination starter with fused disconnect switch & Start - Stop pushbuttons

NEMA IEC

Power circuit

Control circuit

Page 8: Comparison of Iec and Nema Schematic Diagrams (1)

88888 EATON ELECTRIC LIMITED Comparison of IEC & NEMA Schematic Diagrams Effective November 2003

Common Schematic diagrams Manual starter

NEMA IEC

Power circuit

Eaton Electric LimitedReddings LaneBirminghamTel: 0121 685 2100Fax: 0121 760 9996www.eaton.com

© Eaton Electric LimitedAll Rights ReservedPrinted in U.K.Form No. TD08901001UNovember 2003


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