IEC and NEMA standards of marine electrotecnology
INTERNATIONAL ELECTROTECHNICAL COMMISSION
It is a non profit, non-governmental, international standard organization that prepares and publishes international standards for all electrical, electronic and related technologies - collectively known as " electrotechnology".
IEC standards cover a vast range of technologies from power generations, transmission and distribution to home appliances and office equipment, semiconductor, fiber optics, batteries, solar energy, nanotechnology and marine energy.
IEC works from its central office (CO) in Geneva who supports technical committees in the development of standards. The operations of the CO and the set up of new technical committees (TCs) are guided by the standardization management board ( SMB) from elected members of national committees. (NCs)
The members of NCs are stakeholders from industry, academia, government and NGOs. The NCs form the interested group of each TC by sending their experts to draft the technical content of the standards, they vote in favour or against the proposed drafts and provide comments. 75% of the votes are needed to approve a draft.
IEC standards have numbers in the range from 60000 - 79999. For example
IEC 60027 -- Letter symbols to be used in E.T
IEC 60028 -- International standard for resistance for copper
IEC 60034 -- Rotating electrical machinery
IEC 60038 -- IEC standard voltages etc...
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION
It is the association of electrical equipment and medical imaging manufacturers in the USA. Its approximately 450 member companies manufacture products used in the generation, transmission, distribution, control and end use of electricity.
NEMA assists IEC efforts through extensive management and technical participation. NEMA is very supportive to promoting the adoption of relevant IEC/ISO standards on a sector by sector basis as USA and north american standards. To facilitate the NEMA member's involvement in IEC standards development activities, NEMA sponsors the administration of a large numbers of USA committees. These are called technical advisory groups (TAGs), mirror the associated IEC technical committees and subcommittees in whose activities they participate. The participation may be in the form of merely monitoring and commenting on draft documents issued by committee, or may extend to leadership position in IEC committee.
DIFFERENCE BETWEEN IEC AND NEMA
The NEMA philosophy emphasizes more robust designs for broader applicability. Ease of selection and breadth of application are two of the fundamental main stays within its design philosophy.
The IEC philosophy on the other hand is application and performance. In selecting IEC devices, you need a more sophisticated level of knowledge about the application than is necessary when selecting a NEMA general purpose device. For example you need to know motor load duty cycle, and full motor load current when selecting an IEC contactor. This requirement which may be a drawback in some segment, is a significant advantage in original equipment manufacturer (OEM) segments. For example an equivalent HP-rated IEC device tends to be substantially smaller than its NEMA counterpart. Also IEC products tend to be less expensive.
Ease of selection is the fundamental design advantage of a NEMA style product. Serviceability is another key in the NEMA market. Most NEMA products are serviceable and provide front access to internal parts. Training is one of the biggest difference between IEC and NEMA style products. Because of their application- specific designs, IEC products require a more precise application knowledge in the selection process.
It is a non profit, non-governmental, international standard organization that prepares and publishes international standards for all electrical, electronic and related technologies - collectively known as " electrotechnology".
IEC standards cover a vast range of technologies from power generations, transmission and distribution to home appliances and office equipment, semiconductor, fiber optics, batteries, solar energy, nanotechnology and marine energy.
IEC works from its central office (CO) in Geneva who supports technical committees in the development of standards. The operations of the CO and the set up of new technical committees (TCs) are guided by the standardization management board ( SMB) from elected members of national committees. (NCs)
The members of NCs are stakeholders from industry, academia, government and NGOs. The NCs form the interested group of each TC by sending their experts to draft the technical content of the standards, they vote in favour or against the proposed drafts and provide comments. 75% of the votes are needed to approve a draft.
IEC standards have numbers in the range from 60000 - 79999. For example
IEC 60027 -- Letter symbols to be used in E.T
IEC 60028 -- International standard for resistance for copper
IEC 60034 -- Rotating electrical machinery
IEC 60038 -- IEC standard voltages etc...
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION
It is the association of electrical equipment and medical imaging manufacturers in the USA. Its approximately 450 member companies manufacture products used in the generation, transmission, distribution, control and end use of electricity.
NEMA assists IEC efforts through extensive management and technical participation. NEMA is very supportive to promoting the adoption of relevant IEC/ISO standards on a sector by sector basis as USA and north american standards. To facilitate the NEMA member's involvement in IEC standards development activities, NEMA sponsors the administration of a large numbers of USA committees. These are called technical advisory groups (TAGs), mirror the associated IEC technical committees and subcommittees in whose activities they participate. The participation may be in the form of merely monitoring and commenting on draft documents issued by committee, or may extend to leadership position in IEC committee.
DIFFERENCE BETWEEN IEC AND NEMA
The NEMA philosophy emphasizes more robust designs for broader applicability. Ease of selection and breadth of application are two of the fundamental main stays within its design philosophy.
The IEC philosophy on the other hand is application and performance. In selecting IEC devices, you need a more sophisticated level of knowledge about the application than is necessary when selecting a NEMA general purpose device. For example you need to know motor load duty cycle, and full motor load current when selecting an IEC contactor. This requirement which may be a drawback in some segment, is a significant advantage in original equipment manufacturer (OEM) segments. For example an equivalent HP-rated IEC device tends to be substantially smaller than its NEMA counterpart. Also IEC products tend to be less expensive.
Ease of selection is the fundamental design advantage of a NEMA style product. Serviceability is another key in the NEMA market. Most NEMA products are serviceable and provide front access to internal parts. Training is one of the biggest difference between IEC and NEMA style products. Because of their application- specific designs, IEC products require a more precise application knowledge in the selection process.
Comments