Servicing of Double Insulated Appliances
A double-insulated appliance is marked with one or more of the following: The words “DOUBLE INSULATION” or
“DOUBLE INSULATED” or the double insulation symbol.
Your Blower/Vac is double-insulated to give you added safety. In a double insulated appliance, two systems of
insulation are provided instead of grounding. No grounding means is provided on a double insulated appliance, nor
should a means for grounding be added to the appliance. Servicing a double insulated appliance requires extreme
care and knowledge of the system and should be done only by qualified service personnel. Replacement parts for a
double insulated appliance must be identical to the parts they replace. A double insulated appliance is marked with
the words double insulated or
“double insulation”. The symbol (square within a square) may also be marked on the appliance.
Safety Rules and Instructions:
Extension Cords
Double insulated tools have 2-wire cords and can be used with 2-wire or 3-wire extension cords. Only round jacketed
extension cords should be used, and we recommend that they be listed by Underwriters Laboratories (U.L.) (C.S.A.
in Canada). If the extension will be used outside, the cord must be suitable for outdoor use. Any cord marked as
outdoor can also be used for indoor work.
An extension cord must have adequate wire size (AWG or American Wire Gauge) for safety, and to prevent loss of
power and overheating. The smaller the gauge number of the wire, the greater the capacity of the cable, that is 16
gauge has more capacity than 18 gauge. When using more than one extension to make up the total length, be sure
each individual extension contains at least the minimum wire size. Before using an extension cord, inspect it for loose
or exposed wires, damaged insulation, and defective fittings. Make any needed repairs or replace the cord
if necessary.
Minimum Gauge for Cord Sets
Volts
Total length of Cord in
Feet
(meters)
120 V
25
(7.6)
50
(15.2)
100
(30.5)
150
(45.7)
240 V
50
(15.2)
100
(30.5)
200
(61.0)
300
(91.4)
Ampere
Rating
American Wire gauge
More
Than
not
More
Than
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14
12
12 16 14 12
Not
Recommended
Safety Rules and Instructions:
Polarized Plug
To reduce the risk of electric shock, this equipment has a polarized plug (one blade is wider than the other). This