Electric Motor Control Basics - Book - Page 75
NEMA vs IEC Motor Controls
Differentiating Between NEMA and IEC Products
NEMA and IEC electromechanical products differ, but in today’s business environment,
flexibility is essential. If users can apply IEC or NEMA-style products, they’ve got the
flexibility to adapt to product supply and local requirements.
In doing so, they’ve got the benefit of local availability and expertise, which is a
competitive edge. However, to adequately apply this flexibility, you need to understand
the differences between NEMA and IEC designs.
1. Different Philosophies
The philosophy upheld by NEMA emphasizes on robust designs for applicability on a
broader scope. The two primary fundamental mainstays within the philosophy are ease
of selection and range of application.
The design of NEMA motor control devices is governed by the NEMA Industrial Control
Standard (ICS-2). This is a formal document that contains detailed information about
the electromechanical design of NEMA motor control.
On the other hand, the IEC philosophy revolves around performance and application.
IEC devices require a sophisticated level of knowledge about the equipment in
question. For example, you must understand the duty cycle, motor load, and full load
This requirement may be a drawback in some segments. In some others, it’s a
considerable advantage, especially in the Original Equipment Manufacturer sector.
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