(1) Make sure the operating switch is located in a
position that makes it difficult to accidentally operate the
tool.
(2) Use the correct operating switch.
• Make sure hand-held gasoline-powered chain saws have a
constant pressure throttle control that will shut off power to
the chain when the pressure is released.
• Use a constant pressure switch that will shut off the
power when the switch is released to turn on or operate any
hand-held power tool.
Exemptions:
• Some tools can use a lock-on feature with the constant
pressure switch if the lock-on feature can be turned off with
a single motion of the same finger(s) that turned it on. You
can use a lock-on feature with these hand-held tools:
– Drills
– Tappers
– Fastener drivers
– Grinders using a wheel greater than two inches in
diameter
– Disc sanders
– Belt sanders
– Reciprocating saws
– Saber, scroll and jig saws using a blade with a shank
width greater than one-quarter inch
– Other similarly operating powered tools.
• You can use a positive "on-off" switch with these
hand-held tools:
– Platen sanders
– Grinders using a wheel two inches or less in diameter
– Routers
– Planers
– Laminate trimmers
– Nibblers
– Shears
– Saber, scroll and jig saws using a blade with a shank
width of one-quarter inch (± .05 inch) or less.
Note:
The shank width of saber, scroll and jig saw blades is measured at the narrowest point on the blade shank.