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Type B (American 3-pin or U-ground)
Main article: NEMA connector
圖片參考:
http://upload.wikimedia.org/wikipedia/en/thumb/5/5b/Domestic_AC_Type_B_USA.jpg/165px-Domestic_AC_Type_B_USA.jpg
圖片參考:
http://upload.wikimedia.org/wikipedia/en/thumb/6/67/P2050397.JPG/100px-P2050397.JPG
On the left is a North American grounded (earthed) plug, and in the center is a decora style outlet. A more common style of NEMA 5-15 duplex outlet is shown on the right. This socket will also accept an ungrounded (two prong) plug whether polarized or unpolarized.
A Ground Fault Interrupter (GFI/GFIC) outlet, is similar but has "test" and "reset" buttons.
NEMA 5-15 (North American 15 A/125 V grounded)
The type B plug has two flat parallel blades like type A, but has a round ground or earthing pin (American standard NEMA 5-15/Canadian standard CSA 22.2, № 42).[7] It is rated for 15 amperes at 125 volts. The ground pin is longer than the live and neutral blades, so the device is grounded before the power is connected. The neutral blade in the type B socket is wider than the live one to prevent polarized type A plugs being inserted upside-down. Type B plugs often have both pins narrow since the ground pin enforces polarity.
The 5-15 socket is standard in all of North America (Canada, the United States and Mexico). It is also used in Central America, the Caribbean, northern South America (Colombia, Ecuador, Venezuela and part of Brazil), Japan, Taiwan and Saudi Arabia.
Looking directly at a type B outlet with the ground at the bottom, the neutral slot is on the left, and the live slot is on the right. They may be installed with the ground at the top or on either side.
In the theater, this connector is sometimes known as PBG for "Parallel Blade with Ground", or Hubbell, the name of a common manufacturer.
In new residential construction since about 1992, a 20-amp receptacle with a T-slot for the neutral blade allows either 15-ampere parallel blade plugs or 20-ampere plugs to be used.
JIS C 8303, Class I (Japanese 15 A/100 V grounded)
Japan also uses a Type B plug similar to the North American one.However it is less common than its Type A equivalent.