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Safety Guards, Operating Controls, and Safety Switches
Machine guards, as appropriate, must be provided to protect the operator and others from the following:
Safety guards must never be removed when a tool is being used.
Portable circular saws having a blade greater than 2 inches (5.08 centimeters) in diameter must be equipped at all times with guards.
An upper guard must cover the entire blade of the saw.
A retractable lower guard must cover the teeth of the saw, except where it makes contact with the work material.
The lower guard must automatically return to the covering position when the tool is withdrawn from the work material.
Operating Controls and Safety Switches:
The following hand-held power tools must be equipped with either a positive "on-off" control switch, a constant pressure switch, or a "lock-on" control: disc sanders with discs 2 inches (5.08 centimeters) or less in diameter; grinders with wheels 2 inches (5.08 centimeters) or less in diameter; platen sanders, routers, planers, laminate trimmers, nibblers, shears, and scroll saws; and jigsaws, saber and scroll saws with blade shanks a nominal 1/4-inch (6.35 millimeters) or less in diameter. It is recommended that the constant pressure control switch be regarded as the preferred device.
Other hand-held power tools such as circular saws having a blade diameter greater than 2 inches (5.08 centimeters), chain saws, and percussion tools with no means of holding accessories securely must be equipped with a constant-pressure switch.
More Specific Safety Rules/Information: