Double Insulated Power Tools
Plug and outlet, 2 prong
Outlets for 2-Prong Plug
Any electric powered tool that is marked Double insulated only need a two prong
connection and will be perfectly safe to operate.
These tools do not require grounding as they are fitted with an additional insulation
system internally that complies with all relevant electrical safety standards.
Unlike the three prong tools these tools CAN be connected through outlets suitable
for two prong or three prong plugs.
The Illustration above shows the outlets that this type of tool can be connected to.
Power Extension Cords
Any power tool marked 'Grounding required' MUST only be connected to a three wire
extension cord. Only double insulated tools can be connected to two wire cords.
When using any extension cord the machine will suffer a power reduction due to the
drop in voltage caused by the length of the cord. This can be partially offset by selecting
extension cords with lower gauge wire.
Ampere
Rating
More
Not More
Than
Than
0
6
6
10
10
12
12
16
Table 1
MINIMUM GAUGE FOR CORD SETS
Total Length of Cord in Feet(Meter)
0-25
(0-7.6)
18
18
16
14
9
26-50
51-100
(7.9-15.2)
(15.5-30.5)
AWG
16
16
16
14
16
14
Not Recommended
12
101-150
(30.8-45.7)
14
12
12