Electric Motor Control Basics - Book - Page 72
NEMA vs IEC Motor Controls
How to select the best choice for your needs
In measuring electric motors and motor controls, there are two standards in use:
the National Electrical Manufacturers Association (NEMA) and the International
Electrotechnical Commission (IEC). Basically, NEMA vs IEC.
NEMA is mostly used in North America while IEC is used in most parts of the world. But
that doesn’t mean the motors used are different. In fact, NEMA and IEC motors have
the same output power, efficiency, and size.
When choosing between NEMA vs IEC, the pros and cons of each can guide you. Read
on to understand the differences between NEMA vs IEC and how each can suit your
The Background of NEMA vs IEC
For a long time, many clients have preferred to use NEMA ratings over all others. This is
because the ratings pertain to electric motors, enclosures, and motor controllers. Most
American-based companies require that electrical components and enclosures adhere
to NEMA standards.
Recently, IEC has found its way into the market, covering almost the same categories
as NEMA codes. The ratings were originally more specific to the Asian and European
markets. As the world continued to move towards globalization, electrical designers
and engineers have had to conform to IEC standards.
Part 1, Contactors
Basics: Part 2,
Basics: Part 3,
The Benefits of Type E/F
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
NEMA vs IEC Motor