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Grounded Tools: Appliances with Three Prong Plugs
1. Appliances marked with “Grounding Required” have a three wire cord and three prong
grounding plug. The plug must be connected to a properly grounded outlet. If the
appliance should electrically malfunction or break down, grounding provides a low
resistance path to carry electricity away from the user, reducing the risk of electric
shock. (See Figure A.)
2. The grounding prong in the plug is connected through the green wire inside the cord
to the grounding system in the appliance. The green wire in the cord must be the only
wire connected to the appliance’s grounding system and must never be attached to an
electrically “live” terminal. (See Figure A.)
3. Your appliance must be plugged into an appropriate outlet, properly installed and
grounded in accordance with all codes and ordinances. The plug and outlet should
look like those in the following illustration. (See Figure A.)
Double Insulated Appliances: Appliances with Two Prong Plugs
4. Appliances marked “Double Insulated” do not require grounding. They have a special
double insulation system which satisfies OSHA requirements and complies with
the applicable standards of Underwriters Laboratories, Inc., the Canadian Standard
Association, and the National Electrical Code. (See Figure B above.)
5. Double insulated appliances may be used in either of the 120 volt outlets shown in the
following illustration. (See Figure B above.)
EXTENSION CORDS
1. Grounded tools require a three wire extension cord. Double Insulated tools can use
either a two or three wire extension cord.
2. As the distance from the supply outlet increases, you must use a heavier gauge
extension cord. Using extension cords with inadequately sized wire causes a serious
drop in voltage, resulting in loss of power and possible tool damage. (See Table A.)
3. The smaller the gauge number of the wire, the greater the capacity of the cord. For
example, a 14 gauge cord can carry a higher current than a 16 gauge cord. (See
Table A.)
4. When using more than one extension cord to make up the total length, make sure
each cord contains at least the minimum wire size required. (See Table A.)
Figure A
Figure B