3-prong receptacles are the standard type
in use today. The smaller slot is designed
to be connected to the 'hot' (or 'live') side of
the house wiring. The longer slot is
designed to be connected to the 'neutral'
side of the house wiring. The semi-round
hole is for the ground connection (the
Appliances which have a 3-prong plug must
be plugged into a properly wired receptacle to
provide the intended protection against
electrical shock and damage to sensitive
electronic equipment. Typically these are
supplied with metal cased appliances or
appliances that are used with or near water.
They are also used on equipment with
sensitive electronics and surge protectors.
|GFCI & AFCI Protection
GFCI receptacles and breakers are
used to provide additional protection
against dangerous electrical shocks.
See more about GFCI here
AFCI receptacles and breakers are
used to reduce the risk of electrical fire.
See more about AFCI here.
2-prong receptacles were widely used until
the mid 1960's. Until then, most of the
wiring in a typical house did not include a
grounding conductor. The narrow slot is
designed to be connected to the hot side of
the electrical power. Most household
appliances have 2-prong plugs and are not
affected by the lack of the ground
|2-Prong Polarized Plug
There are two types of 2-prong plugs,
polarized & non-polarized. Polarized plugs
are used on some appliances to ensure that
the hot side of the electrical power is
connected correctly to reduce the risk of
electrical shock and/or damage to the
appliance. A non-polarized plug can be
plugged in either way.
|3-Prong to 2-Prong Adapter
An adapter is designed to allow a
3-prong plug to be connected to a
2-prong receptacle. These are typically
misused due to the fact that the green
tab or wire is usually not connected to
ground. To provide the intended
protection the green tab/wire must be
connected to ground.