Chapter 8 Power Tools 185
Copyright Goodheart-Willcox Co., Inc.
• Check that an electric power tool is either
grounded in such a way that any stray electrical
current is directed to the ground without
passing through the user or that it is double
insulated. Double-insulated tools usually have
plastic housing parts wherever a user normally
touches the machine. The electric current is
isolated from any exposed metal parts.
Double-insulated tools are only required to
have a two-conductor power cord. Grounded
tools have a third ground conductor in the
power cord.
• Ensure that electrical outlets that are located
in damp locations or near sources of water are
protected by a ground fault circuit interrupter
(GFCI). Figure 8-7 shows the distinct look of a
GFCI electrical outlet. GFCIs are designed to
monitor the electric current fl ow along the hot fl
and neutral wires of the circuit, and if there
is a difference (as little as 0.005 amp) between
these current values, electricity to the circuit
is interrupted.
• Use all machine guards and shields installed by
the power tool manufacturer. Both parts serve
to protect the user from moving parts and fl ying fl
particles and should never be removed.
Brandon Blinkenberg/Shutterstock.com
Figure 8-7. When operating electric power tools
outdoors or in wet environments, you must connect
to an electric circuit protected with a ground fault
circuit interrupter. Periodic testing of the outlet is
advisable and involves pressing the “Test” button
and confirming that the “Reset” button pops out
and trips the circuit.
FPO
AgEd Connection AgEd Connection
Agric Ag cu ltural mechanics curriculum includes
tra r ai ning ng in n the safe operation of a variety of power
too o ol s s. Most M s agricultural mechanics labs contain an
assor so rt ment of power woodworking and metal fabrication
too o ol s s, from f m table saws to portable welders. The safe
and e ef f fe ctive t use of power tools allows work to take
pla ac e e i in a a more efficient manner than by hand or with
hand d to oo ls. s Take advantage of the training offered
by your o u high i school agriculture teacher and become
pro of icient c e in the use of power tools. That training will
benef e fi t t you o in your agricultural mechanics projects
and inc n cr ease a your employability skills when looking
for o r a a job jo that utilizes power tools. Prior training and
exper x pe ri e en c ce is valuable to an employer and can be
obtaine a n ed while w in class!
Use of Power Tools
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