In general terms the standards applying for motors can be divided into two main categories: IEC/EN and NEMA.
⦁ The IEC/EN standards cover what we normally call ‘IEC’ motors (Europe, Asia). Metric units (SI units) such as metre (m) are applied.
⦁ The International Electrotechnical Commission (IEC) sets standards for motors used in many countries around the world. IEC 60034 standards contain recommended electrical practices that are developed by the participating IEC countries. Mechanical dimensions and tolerances of motors are specified by the IEC 600 72 and EN50347 standards.
⦁ The NEMA standards covers motors in the USA and Canada and other countries related to the US. Imperial (US) units such as inches are applied. The National Electrical Manufacturers Association (NEMA) sets standards for a wide range of electrical products, including motors. NEMA is primarily associated with motors used in North America. The standards represent general industry practices and are supported by manufacturers of electrical equipment. The standard for motors is found in NEMA Standard Publication No. MG1. Some large motors may not fall under NEMA standards.
⦁The IEC/EN standards cover what we normally call ‘IEC’ motors (Europe, Asia). The NEMA standards cover motors in the USA, Canada and other countries related to the US.
⦁The following tables serve as reference lists for electrical and mechanical standards that apply to most induction motors depending on motor type and type of protection.
