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Danish 107-2-D1, standard DK 2-1a, with round power pins and half round earth pin Danish unearthed and switched socket Socket for the tilted flattened pins and half-round earth pin of Danish computer equipment plug (mainly used in professional environment), standard DK 2-5a. This Danish standard plug is described in the Danish Plug Equipment ...
Many plugs manufactured since 1948 are polarized; the neutral blade is 5 ⁄ 16 in or 7.9 mm wide, 1 ⁄ 16 in or 1.6 mm wider than the line blade, so the plug can be inserted only one way. Polarized 1-15P plugs will not fit into unpolarized receptacles, which possess only narrow slots.
In 1933 an asymmetric polarized version was introduced, with line pin slightly offset from the centre line. [27] In 1934 the dual plug system was introduced with the socket rated at 15 A and three sizes of plug, fused 2 A and 5 A plugs and a 15 A plug.
Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]
AC power plugs are also commonly circular, for example, Schuko plugs and IEC 60309. NMEA 2000 cabling using M12 connectors. The M12 connector, specified in IEC 61076-2-101, is a circular electrical plug/receptacle pair with 12mm OD mating threads, used in NMEA 2000, DeviceNet, IO-Link, some kinds of Industrial Ethernet, etc. [16] [17]
(A combined socket, which accepts both plugs according to SN 441011 and IEC 60906-1, would, however, be easy to implement, since a further hole for the earthing contact with the smaller distance would only have to be added opposite the previous central hole.) The hexagonal shape of the Euro plug (2.5 A) is also derived from the Swiss standard.
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