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Independent Electrical Contractors (IEC) is a non-profit trade organization for merit shop electrical and systems contractors. It is based in Arlington, Virginia. [ 1 ] IEC is a member of the U.S. Occupational Safety and Health Administration (OSHA) Alliance program.
The core packages of the CIM are defined in IEC 61970-301, with a focus on the needs of electricity transmission, where related applications include energy management system, SCADA, and planning and optimization. IEC 61970-501 and 61970-452 define an XML format for network model exchanges using RDF.
By 1914, the IEC had issued a first list of terms and definitions covering electrical machinery and apparatus, a list of international letter symbols for quantities and signs for names of units, a list of definitions in connection with hydraulic turbines, and a number of definitions and recommendations relating to rotating machines and ...
IEC TS 61244 Determination of long-term radiation ageing in polymers; IEC TS 61245 Artificial pollution tests on high-voltage ceramic and glass insulators to be used on d.c. systems; IEC 61247 PM-cores made of magnetic oxides and associated parts – Dimensions; IEC 61248 Transformers and inductors for use in electronic and telecommunication ...
The IEC is made up of members, called national committees, and each NC represents its nation's electrotechnical interests in the IEC. This includes manufacturers, providers, distributors and vendors, consumers and users, all levels of governmental agencies, professional societies and trade associations as well as standards developers from ...
The vector group provides a simple way of indicating how the connections of a transformer are arranged. In the system adopted by the IEC, the vector group is indicated by a code consisting of two or three letters, followed by one or two numeric digits. The letters indicate the winding configuration as follows:
IEC 113 (Superseded by IEC 750, i.e. IEC 60750.) IEC 750-1983 (AS 3702 is equivalent, but provides extra information.) IEEE 315-1975 / ANSI Standard Y32.2. Annex F: "Cross reference list of Class Designation Letters" compares IEC 113-2:1971 to the IEEE/ANSI standard. * AS 1102 and IEC 60617 for "Graphical Symbols for Electrotechnology".
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