Nema Vs Iec Symbols

The iec library has more symbols and naming conventions that cover modern devices.

Nema vs iec symbols. Electrical schematic nema iec electrical symbols comparison. Relay symbols and device numbers. Size is the most apparent outward difference between nema and iec motor controls. There s a specific iec symbol for a dc power supply.

How do nema and iec style electromechanical motor control products differ in today s business environment flexibility is an asset. Nema and iec the differences. Selection from iec 617 ieee c37 2 1991 and ieee c37 2 1979 1mrk 590 006 ben page 3 test switch contacts 1. There s nothing in the jic library for one so most people end up drawing a square with terminals on one side and l1 n terminals on the other.

Size ruggedness durability complexity perceived quality and domestic vs global markets are the primary differences between nema and iec motor controls fig. Nema and iec and its derivatives. Understanding motor nameplate information nema vs. This allows you to take the best advantage of local availability and expertise which can be an important.

Break contact voltage supply circuit late opening and early closing upon insertion and withdrawal respectively of the test han dle. If you re able to apply either iec or nema style products you have the flexibility to adapt to local traditions and product supply anywhere in the world. The difference between iec vs nema is that a nema contactor by design may have up to 25 service factor while iec is more focused on space and cost savings by testing components to their exact design rating and using utilization categories to rate devices based on their intended use. In north america the national electric manufacturers association nema sets motor standards including what should go on the nameplate nema standard mg 1 10 40.

Diagram symbols used throughout various parts of the world. Standard electrical iec symbols also known as iec 60617 british standard bs 3939 used to represent various devices including pilot lights relays timers and switches for usage in electrical schematic diagrams. Thus the iec international electrotechnical commission was established in 1906 originally tasked with defining international symbols electrical component standards nomenclature and overall ratings of electrical machinery and apparatus. Note that the test switch contacts number 1 and 18 12 will not.

Comparison of nema and iec schematic diagrams general with the increasing emphasis on globalization many industries are now looking to all parts of the world to produce market and sell their products. The following tables describe the device and show the symbol by area of usage. Here below the cross reference of common schematic wiring diagram symbols used throughout various parts of the world.