[转]IEC60364和NEC相似与差别

发表于2011-04-17     1920人浏览     3人跟帖     总热度:12  

【研究者】
Mark Earley, NFPA
Ken Gettman, NEMA
David Latimer, IEC TC64 Chairman
Francois Martzloff, NIST
John Minick, NEMA
Bob McCullough, IAEI, Ocean County Construction Inspection Department
George Ockuly, Cooper Bussmann
Jim Pauley, Schneider Electric
Jack Wells, Pass & Seymour Legrand
John Young, Siemens
【研究成果】
Two documents serve as the basis for electrical wiring in 90% of the world, according to a report prepared by Underwriters Laboratory.
National Electrical Code (NEC) published by the National Fire Protection Association (NFPA)
IEC 60364 published by the International Electrotechnical Commission.

The NEC was developed based on a need in North America to standardize the installation of electrical systems as they were being developed. The NEC therefore evolved, historically, as systems and technology progressed. The NEC contains mandatory language that allows for use by designers, installers and AHJ’s to ensure that adequate safety levels are met. It covers a wide range of requirements, including hazardous locations (explosive atmospheres), which IEC 60364 does not.

On the other hand, IEC 60364’s purpose is to only provide guidance. Efforts were made to harmonize the electrical installation requirements in 1969, but these efforts were unsuccessful because of the large number of differences between the various systems prevalent throughout Europe. The result, therefore, was a document (IEC 60364) that provided guidance to an authority on developing national wiring principles that would, in turn, serve as the basis to further develop practices, such as are outlined in the NEC. As stated in a report prepared by Underwriters Laboratory, “Countries adopting IEC 60364…need to develop additional rules usable by electrical system designers, installers, and enforcing authorities.”

The NEC is in use in all 50 states in the United States. Countries that have formally adopted the NEC include Mexico, Costa Rica, Venezuela and Columbia. Many countries in South America use the Code, and it has been translated into Spanish, Korean and Japanese. (Candee, Keith, Bunker)

The NEC has a regular, three-year cycle for updating its material. There are 478 people on 20 NEC code-making panels involved in a rigorous review of the material contained within the NEC and ensuring that it reflects the current state of the art. (Bunker)

Revision of IEC 60364 is not done on a regular timetable, as with the NEC. It is a collection of 38 documents and 10 amendments, all of which have varying publications date. There are some documents contained within IEC 60364 that have not been updated since being issued in 1977.

The NEC does not limit specific voltage requirements for an installation. The IEC, on the other hand, does limit its scope to the installation of circuits up to 1,000 V. Such limitations, the report states, “this could be a serious consideration for high-rise building installations.”

The report outlines some of the difficulties involved with using IEC 60364 because of the layout of the document. Requirements are located throughout a number of chapters, some of which contain information that was issued in 1977, for example. (An amendment was appended to this chapter, however, to delete the references to some of the outdated information.) The report goes on to further state “rules which cover one safety feature are located in different parts of the documents.”

Furthermore, because IEC 60364’s rules stop at the socket outlet, it does not take into account the overcurrent protection that may be required for current-using equipment, as does the NEC. This could result in “inappropriate or hazardous installations” when using IEC 60364.

Even though it would be necessary to make some adjustments in the NEC because of metric conversions and the use of 240 V systems versus 120 V systems, the report goes on to say that “from the standpoint of unifor
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  • 奖励于 2011-04-19 16:07:27

 发表于2011-04-17   |  只看该作者      

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【研究表格】


[转]IEC60364和NEC相似与差别_1 

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  • 奖励于 2011-04-17 22:06:32

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【研究表格】


[转]IEC60364和NEC相似与差别_2 

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  • 奖励于 2011-04-17 22:08:49

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7

【研究表格】


[转]IEC60364和NEC相似与差别_3 

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  • 奖励于 2011-04-17 22:09:40

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