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IEC 60309 (formerly IEC 309, also published by CENELEC as EN 60309) is an international standard from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes". The highest voltage allowed by the standard is DC or AC; the highest current, ; and the highest frequency, . The temperature range is to .〔''Scope'' section 1, '' International Standard 60309-1 edition 4.1 Part 1 General Requirements'' , 2005, International Electrotechnical Commission, page 13〕 There is a range of plugs and sockets of different sizes with differing numbers of pins, depending on the current supplied and number of phases accommodated. The fittings also include limited (IP44) weather-proofing, that is one reason for choosing these fittings when the connections will be used in open-air conditions; a further reason for using these (other than when the heavy-current or three-phase facilities are actually needed), is to deter potential users from connecting domestic appliances to the sockets, as 'normal' domestic plug-tops will not fit. The cable connectors and sockets are colour-coded, according to the voltage range and frequency used; for example, common colours are yellow for 100–130 volts and 50–60 Hz, blue for 200–250 volts and 50–60 Hz, and red for 400–480 volts and 50–60 Hz. Color codes depend on the highest, phase-to-phase, voltage. In addition to the colour-coding the voltage and frequency are encoded by the keyway position. The blue fittings are often used for providing weather-proofed exterior sockets for outdoor apparatus. The yellow fittings are used to provide transformer isolated 110 V supplies for UK construction sites to reduce the risk of electric shock and this use spills over into uses of power tools outside of the construction site environment. In camping situations, the large 32 A blue fittings provide power to static caravans, whilst the smaller blue 16 A version powers touring caravans and tents. The red three-phase versions are used for three-phase portable equipment. ==Standardization== IEC 60309-1 specifies general functional and safety requirements for any form of industrial high-current power connector.〔BS EN 60309-1, IEC 60309-1: "Plugs, socket-outlets and couplers for industrial purposes. General requirements." (1999/2012)〕 IEC 60309-2 specifies a range of mains power connectors with circular housings, and different numbers and arrangements of pins for different applications. IEC 60309-3 dealt with connectors for use in explosive gas environments, but was withdrawn in 1998.〔BS EN 60309-2, IEC 60309-2: "Plugs, socket-outlets and couplers for industrial purposes. Dimensional interchangeability requirements for pin and contact-tube accessories." (1999/2012)〕 The standardization was originally done by the CEE (''Commission internationale de réglementation en vue de l'approbation de l'équipement électrique''), being a European certification body that became the IECEE in 1985 (International Commission on the Rules for the Approval of Electrical Equipment) as part of the IEC. It is the same standardization body that had also catered for the home AC plugs in the "CEE 7" series (CEE 7/4 alias German Schuko, CEE 7/5 French and CEE 7/7 French/German hybrid plug, and later the CEE7/16 Europlug). The industrial sockets were standardized in the 1960s in the CEE 17 series that was adopted in the UK as BS 4343 and which were later to become the IEC 60309 standard. IEC 60309-4 concerns switched socket-outlets and connector interlocks. In the United Kingdom, this standard was first adopted as BS 4343:1968 and has since been replaced by its European equivalent BS EN 60309-4.〔BS EN 60309-4: "Plugs, socket-outlets and couplers for industrial purposes. Switched socket-outlets and connectors with or without interlock." (2007/2012)〕 In the UK these plugs are often referred to as caravan, Commando (a brand name used by MK Electric), CEE industrial, CEEform or simply CEE plugs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IEC 60309」の詳細全文を読む スポンサード リンク
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