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Plug and socket connectors are usually made up of a male plug (typically pin contacts) and a female socket (typically receptacle contacts). Often, but not always, sockets are permanently fixed to a device as in a chassis connector (see above) , and plugs are attached to a cable.
This is useful as disconnecting under load will cause arcing which may cause damage to both the plug and socket, and risk injury to the user. The pilot pin is located in the centre of main contact circle on 4- and 5-pin connectors. On 3-pin (2P+E) connectors, it is located on the contact circle opposite the ground pin.
Note 1 of Part II states that there are only minor alterations from BS 317. BS 372 specifies 2A, 5A, 15A and 30A plugs and sockets, the 2 pin versions are in Part I and the 3 pin versions are in Part II. BS 372 Part II was itself superseded in April 1934 by BS 546 which included the same 4 plug/socket sizes with the same dimensions.
Double insulated appliances may omit the earth pin. When viewing a plug from the rear, and the earth pin downwards, the top left pin is active and the top right pin is neutral. The shank of the active and neutral pins of every 10 amp and 15 amp flat-pin plug sold after 3 April 2005 are required to be insulated, in accordance with AS/NZS 3112: ...
The 16 A version is DIN 49445 (socket) and DIN 49446 (plug) and the 25 A version is DIN 49447 (socket) and DIN 49448 (plug). For indoor use at max 25A, it replaced an earlier ( interwar period ) flat oval-shaped 4-pin connector (3 phases and protective earth) that was standardized in DIN 49450 / DIN 49451.
Chinese dual sockets have both an unearthed socket complying with figure 5 of GB 1002-2008 (both flat pin and 4.8 mm round pin), and an earthed socket complying with figure 4 of GB 1002-2008. Both Thai and Chinese dual sockets also physically accept plugs normally fitted to 120 V appliances (e.g. 120 V rated NEMA 1-15 ungrounded plugs).
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