It also has a 4.8 mm diameter round or U-shaped earth pin, which is 3.2 mm longer than the two flat blades, so the device is grounded before the power is connected. It has two flat 1.5 mm thick blades, spaced 12.7 mm apart, measuring 15.9 – 18.3 mm in length and 6.3 mm in width. This class I plug is designated as American standard NEMA 5-15. The user cannot plug in the device without removing the tag, so the user is sure to see the tag. For example, a manufacturer might apply a plastic band through the hole and attach it to a tag that says: “You must do X or Y before plugging in this device”. Moreover, electrical devices can be factory-sealed by the manufacturer using a plastic tie or a small padlock through one or both of the plug prong holes. In this way, vending machines and the like cannot be unplugged. There are also some special outlets which allow you to lock the cord into the socket, by putting rods through the holes. Some sockets, however, do not have those bumps but just two spring-action blades that grip the sides of the plug pin, in which case the holes are not necessary.
It also improves the contact between the plug and the outlet. This prevents the plug from slipping out of the socket due to the weight of the plug and cord. These bumps fit into the holes so that the outlet can grip the plug’s prongs more firmly. If you were to take apart a type A or B socket and look at the contact wipers that the prongs slide into, you would find that in some cases they have have bumps on them. These holes aren’t there without a reason. Type A and B plugs have two flat prongs with (often, but not always) a hole near the tip. Since 1965, ungrounded type A outlets are not permitted anymore in new constructions in the United States and Canada, but they can still be found in older buildings. The blade connected to neutral is 7.9 mm wide and the hot blade is 6.3 mm wide. Type A plugs are generally polarised and can only be inserted one way because the two blades do not have the same width. The plug has two flat 1.5 mm thick blades, measuring 15.9 – 18.3 mm in length and spaced 12.7 mm apart. It is known as NEMA 1-15 and was invented in 1904 by Harvey Hubbell II. This class II ungrounded plug with two flat parallel prongs is pretty much standard in most of North and Central America.
CHANGING SIDEWAYS 115 VOLT PLUG FULL
(The full list of countries that use types A & B can be found here.) TYPE A There are two types of domestic wall outlets in use in the US, Canada, Japan and Central America: the ungrounded type A (NEMA 1-15) and the grounded type B (NEMA 5-15).
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