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GROUNDING INSTRUCTIONS
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Double Insulated Tools: Tools with 
Two Prong Plugs
1.  Tools 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.
2.  Double insulated tools may be used in either of the 
120 volt outlets shown in the following illustration.  
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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.  ]&//#,*%$/#<K^
3.  The smaller the gauge number of the wire, the 
greater the capacity of the cord.  For example, 
a 14 gauge cord can carry a higher current 
than a 16 gauge cord.  ]&//#,*%$/#<K^
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.  ]&//#,*%$/#<K^
5.  If you are using one extension cord for more 
than one tool, add the nameplate#amperes 
and use the sum to determine the required 
minimum cord size.  ]&//#,*%$/#<K^
6.  If you are using an extension cord outdoors, make 
sure it is marked with the suffix “W-A” (“W” in 
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, 
excessive heat, and damp or wet areas.
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