Cables withUSPlug Type and Switch , Kabel dengan Saklar dan Steker Model Amerika Merk Fatro CPF309US
- NEMA 1–15 (North American 15 A/125 V ungrounded)
This plug and socket, with two flat parallel non-coplanar blades and slots, is used in most of North America and on the east coast of South America on devices not requiring a ground connection, such as lamps and "double insulated" small appliances. It has been adopted by 38 countries outside North America , and is standardized in the U.S. by the National Electrical Manufacturers Association. NEMA 1–15 sockets have been prohibited in new construction in the United States and Canada since 1962, but remain in many older homes and are still sold for replacement. Type A plugs are still very common because they are also compatible with newer type B (three-prong) sockets. In Pakistan Type A plug is used with hybrid socket , for home and small offices.
Initially, the plug's prongs and the socket's slots were the same width (or height, in a vertical orientation), so the plug could be inserted into the socket either way around. Most sockets and plugs manufactured from the 1950s onward are polarized by means of a neutral blade/slot wider than the live blade/slot, so the plug can be inserted only the right way. Polarized type A plugs will not fit into unpolarized type A sockets, which possess only narrow slots. But both unpolarized and polarized type A plugs will fit into polarized type A sockets and into type B (three-prong) sockets. Some devices that do not distinguish between neutral and live, such as internally isolated electronic power supplies, are still produced with unpolarized type A pins (both narrow).
- JIS C 8303, Class II (Japanese 15 A/100 V ungrounded)
Japanese outlet with ground post, for a washing machine.
The Japanese plug and socket appear physically identical to NEMA 1–15. However, the Japanese system incorporates stricter dimensional requirements for the plug housing, different marking requirements, and mandatory testing and approval by MITI or JIS.
Many Japanese outlets and multi-plug adapters are unpolarized—the slots in the sockets are the same size—and will accept only unpolarized plugs. Japanese plugs generally fit into most North American outlets without modification, but polarized North American plugs may require adapters or replacement non-polarized plugs to connect to older Japanese outlets. However, in Japan the voltage is supplied at only 100 volts, and the frequency in eastern Japan is 50 rather than 60 Hz. Therefore, many North American devices which can be physically plugged into Japanese sockets may not function properly, though some devices with rectified power supplies may work without problems.
 Type B
NEMA 5–15 plug, left. Decorative-style duplex outlet, center. Ordinary duplex outlet, right.
- NEMA 5–15 (North American 15 A/125 V grounded)
The type B plug has two flat parallel blades like type A, but also adds a round or U-shaped grounding prong (American standard NEMA 5-15/CSA 22.2, No.42). 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. Both current-carrying blades on type B plugs are narrow, since the ground pin enforces polarity. Type A plugs are also compatible with type B sockets, in which case the socket enforces polarity by means of a wide and a narrow slot.
Adapters that allow a Type B plug to be fitted to a Type A outlet are readily available. Proper grounding depends on the Type A outlet having a grounded cover-plate mounting screw, (which often is not the case) and the grounding tab of the adapter being tightly connected to that screw.
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. Outlets may also be installed oriented with the ground at the top, or on either side. Typically connections are:
- Ground: bottom, round hole, green terminal, green or bare wire
- Neutral: top left, larger flat slot, silver terminal, white wire
- Live/Hot: top right, narrower flat slot, brass terminal, black wire (or red wire for 2nd live circuit, top and bottom socket are then separated)
In some parts of the United States and all of Canada, tamper-resistant outlets are now required in new construction. These prevent contact by objects like keys or paper clips inserted into the receptacle.
5–20RA (Canada) or 5-20R (USA)T-slot receptacle mounted with the ground hole up. The neutral connection is the wider T-shaped slot on the lower right.
In theater lighting, this connector is sometimes known as PBG for "Parallel Blade with Ground", Edison or Hubbell, the name of a common manufacturer.
- NEMA 5–20 (North American 20 A/125 V grounded)
This is a 20 amperes receptacle; type 5-20 A has a T-slot for the neutral blade which allows either 15 amperes parallel-blade plugs or 20 amperes 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.