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Grounded Tools: Tools with Three

prong plugs

3-prong plug and Outlet
Tools marked with “Grounding Re-1.
quired” have a three wire cord and
three prong grounding plug. The
plug must be connected to a properly
grounded outlet. If the tool should
electrically malfunction or break
down, grounding provides a low re-
sistance path to carry electricity away
from the user, reducing the risk of
electric shock.
(See 3-prong plug and Outlet.)
The grounding prong in the plug is 2.
connected through the green wire in-
side the cord to the grounding system
in the tool. The green wire in the cord
must be the only wire connected to
the tool’s grounding system and must
never be attached to an electrically
“live” terminal.
(See 3-prong plug and Outlet.)
The tool must be plugged into an 3.
appropriate outlet, properly installed
and grounded in accordance with all
codes and ordinances. The plug and
outlet should look like those in the
preceding illustration.
(See 3-prong plug and Outlet.)

double Insulated Tools: Tools

with Two prong plugs

Outlets for 2-prong plug
Tools marked “Double Insulated” do 1.
not require grounding. They have
a special double insulation system
which satises OSHA requirements
and complies with the applicable
standards of Underwriters Laborato-
ries, Inc., the Canadian Standard As-
sociation, and the National Electrical
Code.
(See Outlets for 2-prong plug.)
Double insulated tools may be used 2.
in either of the 120 volt outlets shown
in the preceding illustration.
(See Outlets for 2-prong plug.)
ExTENSION CORdS
Grounded tools require a three wire 1.
extension cord. Double Insulated
tools can use either a two or three
wire extension cord.
As the distance from the supply outlet 2.
increases, you must use a heavier
gauge extension cord. Using exten-
sion cords with inadequately sized
wire causes a serious drop in voltage,
resulting in loss of power and pos-
sible tool damage.
(See Table A, next page.)