Environmental Engineering Reference
In-Depth Information
FIgure 25.7
A.qualiied.electrician.applying.his.trade.
being.performed..All.temporary.circuits.must.be.protected.by.suitable.disconnect-
ing.switches.or.plug.connectors.at.the.junction.with.permanent.wiring..If.electrical.
installations.in.hazardous.dust.or.vapor.areas.exist,.they.need.to.meet.the.National.
Electrical.Code.(NEC).for.hazardous.locations..In.wet.or.damp.locations,.the.electri-
cal.tools.and.equipment.must.be.appropriate.for.this.use.or.all.hazardous.locations.
or.otherwise.protected..The.location.of.electrical.power.lines.and.cables.(overhead,.
underground,.under.loors,.or.other.side.of.walls).must.be.determined.before..digging,.
drilling,.or.similar.work.begins.
All.energized.parts.of.electrical.circuits.and.equipment.must.guard.against.acci-
dental. contact. by. approved. cabinets. or. enclosures.. Suficient. access. and. working.
space. must. be. provided. and. maintained. about. all. electrical. equipment. to. permit.
ready.and.safe.operations.and.maintenance.
Low-voltage. protection. must. be. provided. in. the. control. device. of. motor-driven.
machines.or.equipment.that.could.cause.(probable).injury.from.inadvertent.starting..
Each.motor.disconnecting.switch.or.circuit.breaker.must.be.located.within.sight.of.the.
motor.control.device..Each.motor.located.within.sight.of.its.controller,.or.the..controller.
disconnecting.means.that.is.capable.of.being.locked.in.the.open.position,.must.have.a.
separate.disconnecting.means.installed.in.the.circuit.within.sight.of.the.motor.
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