Grounding
WARNING: Improperly connecting the grounding wire can result in the risk of electric
shock. Check with a qualified electrician if you are not sure that the outlet is
properly grounded. Do not modify the plug provided with the tool. Never
remove the grounding prong from the plug. Do not use the tool if the cord or
plug is damaged. If damaged, have it repaired by a qualified electrician
before use. If the plug will not fit the outlet, have a proper outlet installed by
a qualified electrician.
The plug must be connected to a properly grounded outlet (see Figure 1). If the tool should electrically
malfunction or break down, grounding provides a low-resistance path to carry electricity away from you, reducing
the risk of electric shock.
Figure 1: Grounded Plug and Outlet
The grounding prong on the plug is connected through the green wire inside 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.
Your tool 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 Figure 1.
Figure 2 illustrates a temporary adapter available for connecting grounded plugs (Figure 1) to two-prong outlets.
The green rigid ear or lug extending from the adapter must be connected to a permanent ground such as a
properly grounded outlet box or receptacle. Simply remove the center screw from the outlet, insert the adapter
and reattach the screw through the green grounding ear to the outlet. If in doubt of proper grounding, call a
qualified electrician. A temporary adapter should only be used until a properly grounded outlet can be installed by
a qualified electrician. The Canadian Electrical Code prohibits the use of temporary adapters.
Figure 2: Temporary Grounding Adapter
Extension Cords
Grounded tools require a three-wire extension cord. 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. Refer to Table I below to determine the required
minimum wire size.
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