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Lockout...
Tagout...
Tryout !
Failure to lock, tag
and try electrical
equipment is one
of the top 5 causes
of all fatal mining
accidents.
A presentation of...
Metal and Nonmetal Safety & Health
Count the Cost of Not
Locking Out...
Metal-Nonmetal Electrical Lockout
Injuries over 10 Years:
30
6
257
45
Fatalities
Permanent disabilities
Lost time injuries
Restricted day injuries
A miner was fatally injured in this log roller when the motor was
started while he worked inside. Electrical power had not been
disconnected. This tragedy could have been avoided had
the victim locked out the power to the machine.
A miner was electrocuted when his hand
came in contact with 480 volts.
He did not lock, tag & try,
nor was he wearing
electrically rated gloves.
Two men were injured when this distribution panel
shorted out during a repair. Electrical energy
had not been disconnected and locked out.
Energy Sources to Control
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Electricity
Machinery
Pressure lines & vessels
Sliding / falling material
Miscellaneous
Hazardous energy must be
controlled when:
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•
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Removing guards, covers, shields
Performing maintenance
Inspecting equipment internally
Troubleshooting
Unchoking
Workers At-Risk
The vast majority of electrical accidents
occurs while work is being performed on
energized circuits during maintenance or
troubleshooting. Even the most qualified
personnel sometimes seem to disregard
the dangers and risks involved.
Reasons Given for Not Locking Out
• Waste of time - lost production time
• Supervisor praise for fast repair
• Only takes a ‘minute’ for repair on
“energized” equipment
• Fatigue: too far or too much trouble to
turn off power
• Finish undesirable task quickly
• Finish before going home
Why to Lock Out
For myself
For my family
For my co-worker
For my profession
For my company
Federal
Regulations
Distribution Boxes
30 CFR 56/57.12006
• Distribution boxes shall be provided with a
disconnecting device for each branch
circuit. Such disconnecting devices shall be
equipped or designed in such a manner that
it can be determined by visual observation
when such a device is open and that the
circuit is deenergized, and the distribution
box shall be labeled to show which circuit
each device controls.
A “distribution box” is an enclosed
portable apparatus through which
an electric circuit is carried to one
or more cables from a single
incoming feed line.
Each cable circuit must be
connected through an individual
overcurrent protective device.
The distribution box should be observable to
indicate when the device is open and the
circuit is deenergized.
Where plugs are used to provide power, the
plugs and cables need to be positively
identified prior to any work on the
equipment.
Positive identification is essential to prevent
an accident from occurring. The following
photo displays why this is so important.
Many distribution boxes and power centers
have a window at each individual circuit where
circuit deenergization can be visually determined
Work on power circuits
30 CFR 56/57.12017
• Power circuits shall be deenergized before
work is done on such circuits unless hot-line
tools are used. Suitable warning signs shall
be posted by the individuals who are to do
the work. Switches shall be locked out or
other measures taken which shall prevent the
power circuits from being energized without
the knowledge of the individuals working on
them.
Work on electrically powered equipment
30 CFR 56/57.12016
• Electrically powered equipment shall be
deenergized before mechanical work is
done on such equipment. Power switches
shall be locked out or other measures taken
which shall prevent the equipment from
being energized without the knowledge of
the individuals working on it.
30 CFR 56/57.12016, continued
• Suitable warning notices shall be
posted at the power switch and signed
by the individuals who are to do the
work.
• Such locks or preventive devices shall
be removed only by the persons who
installed them or by authorized
personnel.
Electrically Powered Equip.
• De-energize before mechanical work
• Lock out power switches
• Post warning notice
– ID tag on lock is OK
• Lock must be installed and removed only
by person to whom it is issued
BRANCH CIRCUIT
DISCONNECTING DEVISES
30 CFR 57.12084.
• Disconnecting switches that can be
opened safely under load shall be
provided underground at all branch
circuits extending from primary power
circuits near shafts, adits, levels and
boreholes.
Lockout
Hardware
Locks
Multi-lock adapters
Tags
To quickly identify the worker
who is using the lock
Lockout
Procedures
Prepare
• Pre-plan
• Coordinate w/ others
– Operators, co-workers, contractors
• Erect barricades / warning signs
Shutdown
• Use stop switch
• If multiple switches, use one closest
to equipment
• Do not use disconnect switch to stop:
arcing could cause injury / damage
Isolate
• Disconnect from all energy sources
• Insulate self from electrical power
– non-conductive platform, gloves, dry
clothes
• Stand to side of disconnect device,
not in front
• Avert eyes & face
Left Hand
Disconnect
Eyes Averted,
Insulating
Platform for Wet
Conditions
Right Hand MCC Disconnect
Stand Aside, Eyes Averted
Insulated Gloves for Higher
Voltage
Lockout
• Affix lock or appropriate device to
disconnect switch
• Do not lock out start / stop switch
• Latch shackle & remove key
• Personal locks: keep key
• System locks: key placed in system
lock box
Field Disconnect Lockout
Right
Wrong
Main Disconnect Lockout
• This shows how a
main disconnect
should be locked
and tagged.
Motor Starter Lockout
• This shows how a
motor starter should
be locked and
tagged.
Single Pole Circuit
Breaker Lockout
• This shows how a
single pole circuit
breaker should be
locked and tagged.
Double Pole Circuit
Breaker Lockout
• This shows how
a double pole
circuit breaker
should be locked
and tagged.
Single Pole Switch Lockout
• This shows how a
single pole switch
should be locked
out and tagged.
Cable Plug Lockout
• This shows how a cable plug should
be locked and tagged.
Latch the Lock’s Shackle !!
But don’t lock through
another person’s lock !
Independent Power Sources
• Lock out all independent, related parts
of unit or system being repaired
– Valves: lock or chain
– Tag & sign
• Block parts that may drop, creep, drift
or turn
System Lockout
• For related equipment groups
• Provide marked locks & keys in lockable
box in central location
• Person in charge confirms all necessary
equipment has its lock installed & key is
returned to system box
• Install personal locks on system box
System Lock
Boxes
System Locks in Use
#3
#1
#2
Tagout
Tryout
• Verify & Test
– Push “Start” switch
– Equipment should not start
– If equipment starts, shut down &
verify proper equipment is locked out
– If starts & proper equipment is locked
out, warn, post guard & notify
immediately
Release Stored Energy
• Block non-electrical devices that
could release stored energy
• Release spring, hydraulic or
pneumatic pressures
Machinery Guards
• Keep them in place until:
– Machine is stopped
– Power supply de-energized
– Padlocks installed by each person
Start Up Authority
After Repairs
• Reinstall guards first
• Do not start without authority & training
• Communicate with co-workers and
contractors
• Be certain no one is in position to be
injured
Lock Removal
• Personal lock to be removed only by
person to whom it is issued
• System locks may be removed by
authorized persons
Emergency Lock Removal
• Locks may be removed if a person has
been positively determined to be in the
clear. Suggestions if person is absent:
– Contact via telephone at home
– Time card punched out ?
– Vehicle gone from parking lot ?
• Complete written lock removal report
Summary
• Turn off equipment and disconnect power.
• Lockout energy source.
• Tagout the disconnecting device.
• Tryout - test to assure the power is off.
• Release any stored energy.
• When complete… restore power and
remove tag.