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2005: Flat screen TVs and HDTVs are introduced for the first time. This "2-prong" design, 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 lamps; consumer electronics such as clocks, radios, and battery chargers; and other double-insulated small appliances that do not require grounding (earthing). 1-15P plugs have two parallel flat blades, 1⁄4 inch (6.4 mm) wide, 0.06 inches (1.5 mm) thick, 5⁄8-23⁄32 inch (15.9-18.3 mm) long, and spaced 1⁄2 inch (12.7 mm) apart. NEMA non-locking connectors all use blades of various flat and folded shapes (except for the round pins used on grounding connectors). When looking at the plug pins with the earth uppermost the lower left pin is live, and the lower right is neutral. The Electrical Safety Foundation International has stated: "Never remove the ground pin (the third prong) to make a three-prong plug fit a two-prong outlet". This safety flaw has been exploited by a January 2020 Internet phenomenon known as the Outlet challenge, where conductive materials, usually coins or paper clips were dropped into the gap, causing electric sparks, which once led to a building evacuation in Westford Academy.

The adapters include a spade lug to allow connecting to ground, often via the cover screw used to attach the outlet faceplate. These adapters are illegal in some jurisdictions, in particular throughout Canada. 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. Use our 'find an electrician' page to locate one near you. Since at least 1949, numerous receptacle devices have also been invented to use these holes to hold the prongs inside the receptacle slots, using a corresponding latch or locking mechanism. Since January 1, 1974, all new power outlets are required to have a ground connection, using grounded receptacles (typically 5-15R or 5-20R) that accept both grounded and non-grounded plugs. The Japanese plug and socket with narrow insulating faces appear and work physically identical to NEMA 1-15, and such non-grounded receptacles are still common in Japan (though grounded 5-15R and 5-20R receptacles are slowly becoming more common). Some devices that do not distinguish between neutral and line, such as internally isolated AC adapters, are still produced with unpolarized narrow blades. Polarized 1-15P plugs will not fit into unpolarized receptacles, which possess only narrow slots.

There are no 1-20R and 1-30R receptacles, because 1-20P and 1-30P can mate with a corresponding NEMA 5 receptacle. All NEMA 2 devices are two-wire non-grounding devices (hot-hot) rated for 250 V maximum. BS EN 61558-2-5 includes the following definitions: (3.1.101) Shaver transformer: isolating transformer for fixed installation and with a limited output, designed to supply electric shavers, toothbrushes, and similar appliances rated 50 VA or less used in a bathroom. Ungrounded NEMA 1 plugs are still popularly used by manufacturers of small appliances and electronic devices because of the design's low cost and compact size, and they are upward compatible with modern grounded NEMA 5 receptacles. The small hole near the end of the power (non-ground) blades of some NEMA plugs is used for convenience in manufacturing; if present, it must be of specified diameter and position. In older plug designs both blades were the same width, so the plug could be inserted into the receptacle either way around. A GFCI receptacle may be installed indoors where it is sheltered from dampness and corrosion, while still protecting an outdoors receptacle wired downstream.

BS 1363 replaced the BS 546 plug and socket (which are still found in old installations or in special applications such as remotely switched lighting). Although standards exist for 2-15, 2-20 and 2-30, this series is obsolete, and only Hubbell still manufactures 2-20 devices (for repair purposes). This series of devices is specified for 600-volt, two-wire, non-grounding devices. This series of devices is specified for 277-volt, two-wire, non-grounding devices. Four in five EV owners charge their cars at home - the rest using public devices or facilities at work places, industry figures show. All NEMA 5 devices are three-wire grounding devices (hot-neutral-ground) rated for 125 V maximum, with the 5-15, 5-20 and 5-30 being grounded versions of the 1-15, 1-20 and 1-30, respectively. The addition is a 3⁄16-inch (4.8 mm) diameter round or U-shaped ground pin, 1⁄8 in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by 1⁄4 in (6.4 mm) edge-to-edge or 15⁄32 in (11.9 mm) center-to-center. The blades of a NEMA connector are identified within the dimensional standard as follows: 'G' identifies the grounding conductor, 'W' identifies the (grounded) neutral conductor, and 'X', 'Y', and 'Z' are the "hot" line conductors.

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