BS 546, describes four sizes of plug rated at 2 A, 5 A (Type D), 15 A (Type M) and 30 A. The plugs have three round pins arranged in a triangle, with the larger top pin being the earthing pin. The plugs are polarized and unfused. Plugs are non-interchangeable between current ratings. Introduced in 1934, the BS 546 type has mostly been displaced in the UK by plugs and sockets to the BS 1363 standard. According to the IEC some 40 countries use Type D and 15 countries use Type M. Some, such as India and South Africa, use standards based on BS 546.
Brazil, which had been using mostly Europlugs, and NEMA 1–15 and NEMA 5–15 standards, adopted a (non-compliant) variant of as the national standard in 1998 under specification NBR 14136 (revised in 2002). These are used for both 220 volt and 127 volt regions of the country, despite the IEC 60906-2 recommendation that NEMA 5-15 be used for 120 V connections. There are two types of sockets and plugs in NBR 14136: one for 10 A, with a 4.0 mm pin diameter, and another for 20 A, with a 4.8 mm pin diameter. This differs from IEC 60906-1 which specifies a pin diameter of 4.5 mm and a rating of 16 A. NBR 14136 was not enforced in that country until 2007, when its adoption was made optional for manufacturers. It became compulsory on January 1, 2010.
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There are several AS/NZS 3112 plug variants, including ones with larger or differently shaped pins used for devices drawing 15, 20, 25 and 32 . These sockets accept plugs of equal or of a lower current capacity, but not of higher capacity. For example, a 10 A plug will fit all sockets but a 20 A plug will fit only 20, 25 and 32 A sockets. In New Zealand PDL 940 "Tap-on" or Piggy-back plugs are available which allow a second 10 A plug, or a charger, to be fitted to the rear of the plug.
In the United Kingdom, Ireland and Malta, there is a two-pin plug and socket for use with electric shavers and toothbrushes. The plug has insulated sleeves on the pins. The BS 4573 socket is suitable for use in dry areas only, so is rarely used in a stand-alone form. It is more usual to find shaver supply units meeting BS EN 61558-2-5 which include an and sockets accepting various two-pin plug types including BS 4573, Europlug and Australian and sometimes a 115 V output for two-pin US plugs. (BS EN 61558-2-5 does not define any particular socket.)