Editing AC power plugs and sockets (section)

==== NEMA 5-15 grounded (Type B) <span class="anchor" id="Type B"></span> ====
[[File:NEMA-AC-Power-Plugs.jpg|thumb|upright=0.9|Ungrounded vs grounded NEMA plugs]]

The NEMA&nbsp;5-15 plug has two flat parallel blades like NEMA&nbsp;1-15, and a ground (earth) pin.<ref name="NEMA">{{Citation |type =standard |url=http://www.nema.org/stds/wd6.cfm |publisher=NEMA |title=WD6, Dimensional requirements for plugs and receptacles |date=14 April 2016}}</ref> It is rated 15&nbsp;A at 125&nbsp;volts. The ground pin is longer than the live and neutral blades, such that an inserted plug connects to ground before power. The ground hole is officially D-shaped, although some round holes exist and many plugs have round ground pins. Both current-carrying blades on grounding plugs may be narrow, since the ground pin enforces polarity, but outlets have a wider opening for the neutral blade to prevent ungrounded polarized plugs from being put in backwards. This socket is recommended in IEC standard 60906-2 for 120-volt 60&nbsp;Hz installations.

The [[National Electrical Contractors Association]]'s National Electrical Installation Standards (NECA&nbsp;130-2010) recommends that sockets be mounted ''with the ground hole up'', such that an object falling on a partially inserted connector contacts the ground pin first. However, the inverted orientation (with ground pin downwards) is more commonly used. The ground-down orientation has been called the "sad socket", "dismayed face", or "shocked face" by some.<ref>''E.g.'',[https://www.gettyimages.com/photos/sad-socket Sad socket], Getty Images; accessed 2023.09.17. Ernie Smith, '[https://tedium.co/2022/08/19/unusual-electrical-socket-history/ This is my shocked face]', Tedium; accessed 2023.09.17.</ref>

Tamper-resistant sockets may be required in new residential construction, with shutters on the power blade sockets to prevent contact by objects inserted into the socket.<ref>{{Citation |url=http://www.childoutletsafety.org/ |title=Child outlet safety |access-date=21 January 2009 |archive-url=https://web.archive.org/web/20090122051010/http://www.childoutletsafety.org/ |archive-date=22 January 2009 |url-status=live}}</ref>

In [[stage lighting]], this connector is sometimes known as ''PBG'' for ''Parallel Blade with Ground'', ''Edison'' or ''Hubbell'', the name of a common manufacturer.<ref>Drew Campbell ''Technical Film and TV for Nontechnical People'', Skyhorse Publishing Inc., 2002 {{ISBN|1581159986}} Chapter&nbsp;9</ref>