Environmental Engineering Reference
In-Depth Information
.
5.. All.observers.should.be.kept.at.a.safe.distance.away.from.the.work.area.
.
6.. Secure.work.with.clamps.or.a.vise,.freeing.both.hands.to.operate.the.tool.
.
7.. Avoid.accidental.starting..The.worker.should.not.hold.a.inger.on.the.switch.
button.while.carrying.a.plugged-in.tool.
.
8.. Tools.should.be.maintained.with.care..They.should.be.kept.sharp.and.clean.
for.the.best.performance..Follow.instructions.in.the.user's.manual.for.lubri-
cating.and.changing.accessories.
.
9.. Be.sure.to.keep.a.secure.footing.and.maintain.good.balance.
.
10.. Proper.apparel.should.be.worn..Loose.clothing,.ties,.or.jewelry.can.become.
caught.in.moving.parts.
.
11.. All.portable.electric.tools.that.are.damaged.must.be.removed.from.use.and.
tagged.“Do.Not.Use.”
Hazardous. moving. parts. of. a. power. tool. must. be. safeguarded.. For. example,.
belts,.gears,.shafts,.pulleys,.sprockets,.spindles,.drums,.lywheels,.chains,.or.other.
reciprocating,.rotating,.or.moving.parts.of.equipment.must.be.guarded.if.such.parts.
are.exposed.to.contact.by.employees..Guards,.as.necessary,.should.be.provided.to.
.protect.the.operator.and.others.from.the.following:
•. Point-of-operation
•. In-running.nip.points
•. Rotating.parts
•. Flying.chips.and.sparks
Safety. guards. must. never. be. removed. when. a. tool. is. being. used.. For. example,.
portable. circular.saws. must. be. equipped. 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.when.it.makes.contact.with.the.work.material..The.lower.guard.must.auto-
matically.return.to.the.covering.position.when.the.tool.is.withdrawn.from.the.work.
The.following.hand-held.powered.tools.must.be.equipped.with.a.momentary.con-
tact.“on-off”.control.switch:.drills;.tappers;.fastener.drivers;.horizontal,.vertical,.and.
angle.grinders.with.wheels.larger.than.2.inches.in.diameter;.disc.and.belt.sanders;.
reciprocating. saws;. saber. saws;. and. other. similar. tools.. These. tools. may. also. be.
equipped. with. a. lock-on. control,. provided. that. turnoff. can. be. accomplished. by. a.
single.motion.of.the.same.inger.or.ingers.that.turn.it.on.
The. following. hand-held. powered. tools. may. be. equipped. with. only. a. positive.
“on-off”.control.switch:.platen.sanders,.disc.sanders.with.discs.2.inches.or.less.in.
diameter,.grinders.with.wheels.2.inches.or.less.in.diameter,.routers,.planers,.lami-
nate.trimmers,.nibblers,.shears,.scroll.saws.and.jigsaws.with.blade.shanks.
1
/
4
.inch.
wide.or.less.
Other. hand-held. powered. tools. such. as. circular. saws. having. a. blade. diameter.
greater.than.2.inches,.chain.saws,.and.percussion.tools.without.means.for.positive.
accessory.holding.must.be.equipped.with.a.constant.pressure.switch.that.will.shut.off.
the.power.when.the.pressure.is.released.
Employees.using.electric.tools.must.be.aware.of.several.dangers;.the.most..serious.
is.the.possibility.of.electrocution..Among.the.chief.hazards.of.electric-powered.tools.
