Grounding
To prevent electric shock and death from
incorrect grounding wire connection:
Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded. Do not modify the power cord plug provided with the device. Never remove the grounding prong from the plug. Do not use the device if the power cord or plug is damaged. If damaged, have it repaired by a service facility before use. If the plug will not fit the outlet, have a proper outlet installed by a qualified electrician.
Grounded Devices: Devices
with Three Prong Plugs
3-Prong Plug and Outlet
1.Devices 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 device 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
2.The grounding prong in the plug is connected through the green wire inside the cord to the grounding system in the device. The green wire in the cord must be the only wire connected to the device’s grounding system and must never be attached to an electrically “live” terminal. (See
3.The device 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 preceding illustration. (See
Double Insulated Devices:
Devices with Two Prong Plugs
Outlets for 2-Prong Plug
1.Devices 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 Outlets for
2.Double insulated devices may be used in either of the 120 volt outlets shown in the preceding illustration. (See Outlets for
Extension Cords
1.Grounded devices require a three wire extension cord. Double Insulated devices 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 device 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.)
5.If you are using one extension cord for more than one device, add the nameplate amperes and use the sum to determine the required minimum cord size. (See Table A.)
6.If you are using an extension cord outdoors, make sure it is marked with the suffix
Canada) to indicate it is acceptable for outdoor use.
7.Make sure the extension cord is properly wired and in good electrical condition. Always replace a damaged extension cord or have it repaired by a qualified electrician before using it.
8.Protect the extension cords from sharp objects,
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