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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 preceding illustration. (See
Outlets for 2-Prong Plug.)
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 on page 6.)
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 T able 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 T able A.)
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. (See T able A.)
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.
Table A: RECOMMENDED MINIMUM
WIRE GAUGE FOR EXTENSION CORDS*
(120/240 VOLT )
NAMEPLATE
EXTENSION CORD
AMPERES
(at full load)
25´
0 – 2.0
18
2.1 – 3.4
18
3.5 – 5.0
18
5.1 – 7.0
18
7.1 – 12.0
18
12.1 – 16.0
14
16.1 – 20.0
12
150% of the rated amperes.
LENGTH
50´
75´
100´ 150´
18
18
18
16
18
18
16
14
18
16
14
12
16
14
12
12
14
12
10
-
12
10
-
-
10
-
-
-
6
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