Lock-out and Tag Procedures

1
Lock-out and Tag Procedures

• Presented By
• Paul Micheal Hall
• District 3 Morgantown
• Robert Phillips
• Headquarters - Arlington

2
Purpose of Lock-Out and Tag

• Personal Safety
• Prevent Undue Exposure to Energized Circuits
• Reduce Electrical Fatalities and Accidents

3
Coal Fatals - Total Electrical

• Year Total
  Electrical
• 1970 1999 2946 229
• 2000 38 2
• 2001 42 2
• 2002 27 4
• 2003 29 4
• 2004 8 1
• Total 3090 242

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Coal Fatals - Total Electrical

• Average 90.6 Electrical 7.1 7.8
• (For 1970 to 2003 and Based on 3082 fatalities
  241 electrical)

6
Electricity

• Next to a nuclear reaction, an electrical arc is
  the hottest thing on earth, being seven times the
  temperature at the suns surface.
• Electricity can cause shock, burns, ignitions,
  explosions and even electrocution.
• Be Wise! Stay Alive! Always Deenergize!

7
Circuits that must be Locked-Out and Tagged

• Electrical
• Hydraulic
• Pneumatic
• Mechanical
• Thermal

8
Who must Lock-Out and TagWhen Performing
Electrical Work

• All person(s) doing electrical work on the circuit

9
Trouble Shooting Procedure For Equipment and
Circuits

• Energized Circuit and Equipment
• Low- and Medium-Voltage Only
• Only to determine the problem
• Lock- and Tag- out to perform electrical work

10
EFFECTS OF CURRENT ON THE AVERAGE BODY

11
Current Effects

• How much current does it take to illuminate a 60
  watt, 120 volt light bulb?
• The answer is 0.5 amperes or 500 milliamps.
• This is over five times the current that it takes
  to electrocute someone.

12

• CURRENT EFFECT
• 1 MILLIAMP THRESHOLD OF
  PERCEPTION
• 1 TO 8 MILLIAMPS SENSATION OF
  SHOCK
  
• 8 TO 15 MILLIAMPS PAINFUL SHOCK
• 15 TO 20 MILLIAMPS LOSS OF MUSCULAR
  CONTROL

13

• 20 TO 50 MILLIAMPS BREATHING IS
  DIFFICULT
• 100 TO 200 MILLIAMPS VENTRICULAR
  FIBRILLATION (NO KNOWN REMEDY)
• OVER 200 MILLIAMPS SEVERE BURNS

14
Why People Do Not Lock- Tag-Out

• Takes too long!
• Too far to travel to remove power!
• Will only take a minute!
• Ill do it hot!
• I know what Im doing!
• Have seen others do it or have done it themselves!

15
ELECTRICAL FATALITIES BY STATE 1970 - 2003
3
3
6
16
Percentage of Electrical Fatalities by Location
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23
American Eagle Mine     4605437 02/18/2000        
   AGE 44 EMPLOYEE ENTERED SUBSTATION TO
DETERMINE WHAT WORK WILL BE REQUIRED TO REMOVE
THE TRANSFORMER. HE CLIMBED THE TRANSFORMER TO
LOOK AT TOP WHEN HE CAME IN CONTACT WITH LINE.
24
PE 2 Underground          1518008           
04/30/2000       AGE 26   A CERTIFIED
ELECTRICIAN WAS GOING TO MAKE REPAIRS ON THE
RIGHT SIDE POWER CENTER IN THE NO. 5 ENTRY, AND
WAS FOUND LYING BESIDE THE POWER CENTER. IT
APPEARS HE RECEIVED A FATAL ELECTRICAL SHOCK
25
Still Run No. 4   4608726 03/13/2001    AGE
44 AFTER INSTALLATION OF A BANK OF CAPACITORS ON
THE HIGH VOLTAGE LINES FEEDING THE MINE
SUBSTATION, EE (ACCORDING TO WITNESSES) UNPLUGGED
THE 110 V CONTROL CIRCUIT FROM THE RECEPTACLE,
THREW IT TO THE GROUND, PICKED IT BACK UP TO
INSPECT AT THIS TIME CAME IN CONTACT WITH
ELECTRICAL CURRENT.
26
77       1509636   07/20/2001 AGE 26   EE WAS
FATALLY ELECTROCUTED AS HE DISASSEMBLED A
CONVEYOR BELT STARTING BOX SOURCE OF POWER
CAUSING DEATH IN UNKNOWN AT THAT TIME.
27
Mine No. 5        4406051 01/24/2002   AGE
42 SECTION POWER MOVE HAD BEEN MADE. WORK BEING
DONE TO CONNECT THE PHASING. EMPLOYEE
APPROXIMATELY 2 CROSSCUTS FROM POWER CENTER
STATED HE HEARD A STRANGE SOUND FROM THE AREA OF
THE POWER CENTER AND WENT TO THE POWER CENTER AND
FOUND THE DECEASED SLUMPED OVER THE POWER CENTER.
28
Mine 84 3600958 05/11/2002   AGE 46 EE WAS
OPERATING A STAMLER COAL HAULER AND HAD ATTEMPTED
TO TRAM AROUND AN UN CUT CORNER. IN DOING SO HIS
HAULER APPARENTLY PINCHED THE ENEGIZED LOADER
CABLE BETWEEN THE HAULER AND THE COAL RI B. EE
EXITED THE MACHINE TO LOOK AT THE DAMAGE TO THE
CABLE AND WAS APPARENTLY ELECTROCUTED WHEN HE
CONTACTED THE FRAME OF THE COAL HAULER.
29
Huff Creek No 1 1517234 05/21/2002   AGE
50 EMPLOYEE WAS WORKING ON A POWER DISTRIBUTION
BOX TO DETERMINE WHY A CIRCUIT BREAKER WOULD NOT
OPERATE. HE APPARENTLY CAME IN CONTACT WITH AN
ENERGIZED CIRCUIT DURING THE TROUBLE SHOOTING
PROCESS.
30
Calvary No. 80   1516349 05/23/2002   AGE 58 THE
ELECTRICIAN WAS WORKING ON A GROUNDED SHUTTLE CAR
CABLE AND RECEIVED FLASH BURNS WHEN A SHORT
CIRCUIT OCCURED AT THE FEMALE RECEPTACLE ON THE
ELECTRICAL POWER CENTER.
31
Mine No. 4        4407052 01/21/2003   AGE 33 THE
VICTIM WAS ELECTROCUTED NEAR THE FACE OF NO. 8
ENTRY OF THE 001-0 MMU WHILE INSTALLING
SUPPLEMENTAL ROOF SUPPORTS. WHEN ANOTHER WORKER
FINISHED CUTTING A STEEL BEAM WITH A TORCH, AN
ENERGIZ ED TRAILING CABLE WAS DAMAGED CAUSING THE
BEAM TRAILER ON WHICH IT RESTED TO BECOME
ENERGIZED. THE VICTIM THEN CAME IN CONTACT WITH
THE TRAILER, RESULTING IN ELECTROCUTION.
32
No. 50 Mine       4608776 03/23/2003    AGE
49 BREAKER BLEW UP AND BURNED EMPLOYEE.
33
Beaver Valley    3608725 06/13/2003    AGE
41 WHILE TROUBLE SHOOTING MAIN OUTSIDE
SUBSTATION, EMPLOYEE CAME IN CONTACT WITH HIGH
VOLTAGE RESULTING IN DEATH.
34
Upper Big Branch Mine-South    
4608436 07/19/2003       AGE  27 EMPLOYEE WAS IN
THE PROCESS OF REPAIRING 3 SHUTTLE CAR CABLE.
POWER TO CABLE HAD BEEN TAGGED LOCKED OUT. HE
WAS DISCOVERED LYING ON HIS BACK NOT BREATHING.
CPR WAS ADMINISTERED AND HE WAS TRANSPORTED TO
THE HOSPITAL WHERE HE WAS PRONOUNCED DEAD AT
APPROX. 820 P.M. MSHA/STATE INVESTIGATIONS ARE
INCONCLUSIVE AT THIS TIME.
35
Ruby Energy     4608808 02/05/2004  AGE
33 ELECTRICIAN WAS FATALLY ELECTROCUTED WHILE
REPAIRING A MINER CABLE. THE CABLE WAS NOT LOCKED
AND TAGGED OUT BY THE ELECTRICIAN.
36
Regulations requiring Disconnecting Devices?

• 30 CFR 75.509
• "All power circuits and electric equipment shall
  be de-energized before work is done on such
  circuits and equipment, except when trouble
  shooting or testing".

37
75.509 Policy states,

• PPM states in part, "a violation of this Section
  shall be cited only when electrical work is being
  performed on an energized machine....
  Troubleshooting or testing does not include the
  repair of electrical, hydraulic, or mechanical
  problems".

38
75.511

• No electrical work shall be performed on low-,
  medium-, or high-voltage distribution circuits or
  equipment, except by a qualified person or a
  person trained to perform electrical work and to
  maintain electrical equipment under the direct
  supervision of a qualified person....

39
75.511 cont.

• Disconnecting devices shall be locked out and
  suitably tagged by such persons. Locks or tags
  shall be removed only by the persons who
  installed them or, if such persons are
  unavailable, by persons authorized by the
  operator or his agent.

40
75.511 Policy states,

• "For the purpose of this Section, electrical work
  is considered to be work required to install or
  maintain electric equipment or conductors.....
  The phrase "under the direct supervision of a
  qualified person" must, as a minimum, include the
  following

41
75.511 PPM cont.

• 1. The qualified person shall examine and/or test
  an electric circuit or machine and determine the
  need for repair or maintenance
• 2. The qualified person must give specific
  instructions to the employee assigned to perform
  this work with respect to the nature and extent
  of the repairs to be performed and, where
  necessary, prescribe the manner in which the work
  is to be performed

42
75.511 PPM cont.

• 3. The qualified person is, at all times, under
  continuing duty to instruct, advise, or consult
  with the employee in the event the work which he
  has assigned cannot be performed by the employee
  in the manner prescribed and
• 4. The qualified person must examine and test, if
  necessary, the completed work before the circuit
  is energized or the machine is returned to
  service.

43
75.511 PPM cont.

• Disconnecting devices shall be locked out, where
  possible, and suitably tagged by persons who
  perform the work. In all instances, trailing
  cables equipped with cable couplers or fuse nips
  shall be opened, tagged and locked out.
• The person doing the work shall keep the key to
  the padlock in his/her possession to insure that
  the circuit or cable will not be inadvertently
  energized while he or she is in contact with the
  conductors.

44
75.511 PPM cont.

• In every instance, the padlock shall be removed
  by the person who installed it if the person is
  present in the mine. If the person who installed
  the padlock is not present, the operator or the
  operator's agent (a responsible official) must
  designate a person to remove the padlock.
• "Suitably tagged" means that a sign with the
  wording such as "Danger, Repairs in Progress,"
  shall be attached to the locked disconnecting
  device.

45
Disconnecting Devices Installed On-Board Mine
Equipment

• When disconnecting devices are installed on-board
  mine equipment, they may be used to meet the
  requirements of 30 CFR 75.509, 75.511 and 75.1725
  (c)....

46
Disconnect PPM cont.

• To meet the requirements of 30 CFR 75.509, 75.511
  and 75.1725 (c), disconnecting devices must
  function so as to provide positive visual
  conformation that the equipment or circuit is
  deenergized. The worker must be able to easily
  see the power disconnect blades or contacts to
  determine, without any doubt, that the equipment
  or circuit is deenergized and...

47
Disconnect PPM cont.

• To meet the requirements of 30 CFR 75.520,
  disconnecting device enclosures must be
  explosion-proof..... In addition, the enclosure
  housing the disconnecting device must be the
  first enclosure on-board the machine that the
  trailing cable enters....

48
Disconnect PPM cont.

• Permitting a disconnecting device installed
  on-board a machine to be used as the visual
  disconnect for the equipment creates a change in
  established electrical work procedures. As a
  result, all miners who perform maintenance on
  this equipment must receive task training as
  required by 30 CFR 48.7 (a) (3). This training
  must include clear instructions that the
  disconnecting device will only deenergize the
  machine, and that the trailing cable will remain
  energized.

49
75.519

• In all main power circuits, disconnecting
  switches shall be installed within 500 feet of
  the bottoms of shafts and boreholes through which
  main power circuits enter the underground area of
  the mine and within 500 feet of all other places
  where main power circuits enter the underground
  area of the mine.

50
75.519-1 Policy, Main Power Circuit
Disconnecting Switches Locations

• This Section applies to low- and medium-voltage
  power circuits entering a mine and to low-,
  medium-, and high-voltage power circuits at the
  bottom of shafts and boreholes. The requirements
  for disconnecting switches for high-voltage power
  circuits entering a mine are contained in Section
  75.802 (c).

51
75.519-1 PPM cont.

• A high-voltage cable coupler, switch, or other
  device not designed for load-breaking duty that
  is located at the bottom of a shaft or borehole
  may be used in conjunction with a high-voltage
  circuit breaker located on the surface provided
• (1) A remote control switch that, when
  activated, will open the circuit breaker is
  provided at the shaft or borehole and

52
75.519-1 PPM cont.

• (2) A visual or audible means to indicate that
  the circuit breaker has opened when the remote
  control switch is activated is provided at the
  bottom of the shaft or borehole. Signal lights
  will be acceptable if the lights receive power
  through the auxiliary contacts on the circuit
  breaker.

53
75.519-1 PPM cont.

• Unless fuse-type and knife-blade cutout switches
  are designed for load-breaking duty on
  high-voltage circuits, such switches shall be
  used for a disconnecting means only when some
  other means is first used to deenergize the
  circuit.

54
75.601 states in part,

• Disconnecting devices used to disconnect power
  from trailing cables shall be plainly marked and
  identified and such devices shall be equipped or
  designed in such a manner that it can be
  determined by visual observation that the power
  is disconnected.

55
75.601 Policy states,

• Enclosed circuit breakers are not acceptable as
  visual evidence that the power is disconnected.
  Plugs and receptacles located at the circuit
  breaker and trolley nips are acceptable as visual
  means of disconnecting the power.

56
75.705 states in part,...

• High-voltage lines, both on the surface and
  underground, shall be deenergized and grounded
  before work is performed on them,

57
75.705-1 (b) states in part,...

• No high-voltage line, either on the surface or
  underground, shall be regarded as deenergized for
  the purpose of performing work on it, until it
  has been determined by a qualified person (as
  provided in 75.153) that such high-voltage line
  has been deenergized and grounded. Such
  qualified person shall by visual observation

58
75.705-1 (b) cont.

• (1) determine that the disconnecting devices on
  the high-voltage circuit are in open position and
  (2) ensure that each ungrounded conductor of the
  high-voltage circuit upon which work is to be
  done is properly connected to the
  system-grounding medium.

59
75.705-1 (c) states,

• No work shall be performed on any high-voltage
  line on the surface which is supported by any
  pole or structure which also supports other
  high-voltage lines until
• (1) All lines supported on the pole or structure
  are deenergized and grounded in accordance with
  all the provisions of this section which apply to
  the repair of energized surface high-voltage
  lines or

60
75.705-1 (c) cont.

• (2) the provisions of 75.705-2 through 75.705-10
  have been complied with, with respect to all
  lines, which are supported on the pole or
  structure.

61
75.802 (c) states in part,...

• Within 100 feet of the point on the surface
  where high-voltage circuits enter the underground
  portion of the mine, disconnecting devices shall
  be installed and so equipped or designed in such
  a manner that it can be determined by visual
  observation that the power is disconnected, .

62
75.808 states,

• Disconnecting devices shall be installed at the
  beginning of branch lines in high-voltage
  circuits and equipped or designed in such a
  manner that it can be determined by visual
  observation that the circuit is deenergized when
  the switches are open.

63
75.808 Policy states in part,...

• Cable couplers are acceptable as a disconnecting
  device only when used with an acceptable device
  such as a circuit breaker or oil-filled fused
  cutouts that are used to deenergize the circuit
  before the cable coupler is uncoupled.

64
75.808 PPM cont.

• If a remote switch in the ground check circuit is
  used to trip a circuit breaker prior to
  uncoupling the coupler, visible or audible
  evidence must be provided to indicate that the
  circuit breaker has opened before the coupler is
  uncoupled.

65
75.815(a) states

• The section power center must be equipped with a
  main disconnecting device installed to deenergize
  all cables extending to longwall equipment when
  the device is in the open'' position.    

66
75.815(b) states

•     Disconnecting devices for motor-starter
  enclosures must be maintained in accordance with
  the approval requirements of paragraph (f) of
  Sec. 18.53 of part 18 of this chapter. The
  compartment for the disconnect device must be
  provided with a caution label to warn miners
  against entering the compartment before
  deenergizing the incoming high- voltage circuits
  to the compartment.     

67
18.53(f) states
Each motor-starter enclosure, with the exception
of a controller on a high-voltage shearer, must
be equipped with a disconnect device installed to
deenergize all high-voltage power conductors
extending from the enclosure when the device is
in the open'' position.      (1) When multiple
disconnect devices located in the same enclosure
are used to satisfy the above requirement they
must be mechanically connected to provide
simultaneous operation by one handle.      (2)
The disconnect device must be rated for the
maximum phase-to- phase voltage and the full-load
current of the circuit in which it is located,
and installed so that--      (i) Visual
observation determines that the contacts are open
without removing any cover      (ii) The
load-side power conductors are grounded when the
device is in the open'' position      (iii)
The device can be locked in the open''
position      (iv) When located in an
explosion-proof enclosure, the device must be
designed and installed to cause the current to be
interrupted automatically prior to the opening of
the contacts and      (v) When located in a
non-explosion-proof enclosure, the device must be
designed and installed to cause the current to be
interrupted automatically prior to the opening of
the contacts, or the device must be capable of
interrupting the full-load current of the
circuit.
68
75.815(c) states

•     Disconnecting devices must be rated for the
  maximum phase-to- phase voltage of the circuit in
  which they are installed, and for the full-load
  current of the circuit that is supplied power
  through the device.

69
75.815(d) states

• Each disconnecting device must be designed and
  installed so that --
• (1) Visual observation determines that the
  contacts are open without removing any cover
• (2) All load power conductors can be grounded
  when the device is in the open'' position and
  
• (3) The device can be locked in the open''
  position.      

70
75.815(d) states
Disconnecting devices, except those installed in
explosion- proof enclosures, must be capable of
interrupting the full-load current of the circuit
or designed and installed to cause the current to
be interrupted automatically prior to the opening
of the contacts of the device. Disconnecting
devices installed in explosion-proof enclosures
must be maintained in accordance with the
approval requirements of paragraph (f)(2)(iv) of
Sec. 18.53 of part 18 of this chapter.
71
75.903 states,

• Disconnecting devices shall be installed in
  conjunction with the circuit breaker to provide
  visual evidence that the power is disconnected.

72
75.903 Policy, Disconnecting Devices

• A connecting plug on the outby end of the
  trailing cable connected to the power center or
  distribution box will be accepted as a
  disconnecting device. Other means, such as
  switches with visible contacts, may also be
  acceptable for this purpose. Molded-case circuit
  breakers are not acceptable as visible
  disconnecting devices.

73
75.1725 (c) states,

• Repairs or maintenance shall not be performed on
  machinery until the power is off and the
  machinery is blocked against motion, except where
  machinery motion is necessary to make
  adjustments.

74
75.1725 (c) Policy states in part,..

• The trailing cable shall be disconnected from
  the source of power before repairs are made on
  portable or mobile equipment , except when the
  equipment must be operated for making
  adjustments.
• Opening a circuit breaker which is installed on
  the machine, and which opens all power conductors
  entering the machine, shall be acceptable as
  compliance with this Section for lubrication or
  changing bits.

75
77.500 states,

• Power circuits and equipment shall be
  deenergized before work is done on such circuits
  and equipment, except necessary for
  trouble-shooting or testing.

76
77.500 Policy states in part,...

• When electrical work is being performed on
  equipment, it is not necessary to completely
  deenergize the power system if means are provided
  on the equipment to deenergize the particular
  part or circuit on which repair work is to be
  done.

77
77.500 PPM cont.

• When work is performed in close physical
  proximity to exposed electrical circuits or
  parts, they shall be deenergized. High-voltage
  circuits that are not equipped with metallic
  shielding are considered to be exposed. Sections
  110-16 and 710-34 of the 1968 National Electrical
  Code pertaining to working clearances can be used
  as a guide in determining close physical
  proximity.

78
77.500 PPM cont.

• All circuits within an electrical enclosure
  shall be deenergized before work is performed
  within the enclosure unless such energized
  circuits are guarded by suitable physical guards
  or adequate physical separation.

79
77.500 PPM cont.

• As the accident and injury data associated with
  working on energized circuits and equipment
  clearly indicates, this type of work presents a
  significant risk of hand injury. Therefore,
  gloves worn in accordance with 75.1720 (c) and
  77.1710 (c) will be required whenever miners
  trouble-shoot or test energized electrical power
  circuits or electric equipment.

80
77.501 states,

• No electrical work shall be performed on
  electric distribution circuits or equipment,
  except by a qualified person or by a person
  trained to perform electrical work and to
  maintain electrical equipment under the direct
  supervision of a qualified person.

81
77.501 cont.

• Disconnecting devices shall be locked out and
  suitably tagged by the persons who perform such
  work, except that in cases where locking out is
  not possible, such devices shall be opened and
  suitably tagged by such persons. Locks or tags
  shall be removed only by the persons who
  installed them or, if such persons are
  unavailable, by persons authorized by the
  operator or his agent.

82
77.501 Policy states in part,...

• Electrical work, as referred to in this
  Section, includes the design, installation,
  maintenance or repair of electric equipment and
  circuits.
• The term direct supervision shall not be
  interrupted to mean that the qualified person be
  physically present at all times during the
  performance of such repairs, but the qualified
  person has the following responsibilities

83
77.501 PPM cont.

• 1. The qualified person shall examine and/or test
  an electric circuit or machine and determine the
  need for repair or maintenance
• 2. The qualified person must give specific
  instructions to the employee assigned to perform
  this work with respect to the nature and extent
  of the repairs to be performed and, where
  necessary, prescribe the manner in which the work
  is to be performed

84
77.501 PPM cont.

• 3. The qualified person is, at all times, under
  continuing duty to instruct, advise, or consult
  with the employee in the event the work which he
  has assigned cannot be performed by the employee
  in the manner prescribed and
• 4. The qualified person must examine and test, if
  necessary, the completed work before the circuit
  is energized or the machine is returned to
  service.

85
77.501 PPM cont.

• It is MSHAs policy that a person trained to
  perform electrical work and to maintain electric
  equipment under the direct supervision of a
  qualified person shall not be assigned the duty
  of testing or trouble-shooting energized
  circuits. Persons trained to perform electrical
  work and to maintain electric equipment may only
  do testing and trouble-shooting on energized
  circuits as part of their training program.

86
77.501 PPM cont.

• During this testing and trouble-shooting
  operation, a qualified person, as defined in
  Section 77.103, must be present at all times to
  observe, instruct, and aid the trainee.

87
77.501 PPM cont.

• Suitably tagged means that a sign with the
  wording such as Danger - Hands Off - Do Not
  Close - Miners Working on Line, shall be
  attached to the opened disconnecting device. The
  tag should bear the name of the workman who
  installed it.
• Keys to locks used to lock out switches should
  be kept by the person working on the circuit or
  equipment.

88
77.600 states in part,...

• Disconnecting devices used to disconnect power
  from trailing cables shall be plainly marked and
  identified and such devices shall be equipped or
  designed in such a manner that it can be
  determined by visual observation that the power
  is disconnected.

89
77.600 Policy states in part,...

• A visual means of disconnecting the power from
  the trailing cable must be provided so that it
  can readily be determined whether or not the
  cable is deenergized. Enclosed circuit breakers
  are not acceptable as visual evidence that power
  is disconnected. Plugs and receptacles located
  at the circuit breaker would be acceptable as the
  visible means of disconnecting the power.

90
77.704 states in part,...

• High-voltage lines shall be deenergized and
  grounded before work is performed on them, except
  that repairs may be permitted on energized
  high-voltage lines if

91
77.704 Policy states,

• High-voltage lines shall be deenergized with a
  disconnecting device so that it can be determined
  by visual observation that the circuit is
  deenergized before the lines are grounded (refer
  to Section 77.704-9 when operating disconnecting
  devices), except that repairs may be permitted on
  energized high-voltage lines as specified in the
  regulations.

92
77.704-1 states,

• (a) No high-voltage line, either on the surface
  or underground, shall be regarded as deenergized
  for the purpose of performing work on it, until
  it has been determined by a qualified person (as
  provided in 77.103) that such high-voltage line
  has been deenergized and grounded. Such
  qualified person shall by visual observation

93
77.704-1 cont.

• (1) determine that the disconnecting devices on
  the high-voltage circuit are in open position and
  (2) ensure that each ungrounded conductor of the
  high-voltage circuit upon which work is to be
  done is properly connected to the
  system-grounding medium.

94
77.704-1 (b) states,

• No work shall be performed on any high-voltage
  line which is supported by any pole or structure
  which also supports other high-voltage lines
  until
• (1) All lines supported on the pole or structure
  are deenergized and grounded in accordance with
  all the provisions of this 77.704-1 which apply
  to the repair of energized surface high-voltage
  lines or

95
77.704-1 (b) cont.

• (2) the provisions of 77.704-2 through 77.704-10
  have been complied with, with respect to all
  energized lines, which are supported on the pole
  or structure.

96
77.704-1 Policy states,

• There may be instances where one qualified
  electrician will go back some distance from the
  work site and deenergize and ground the
  high-voltage system to be repaired. This
  qualified electrician must be in either direct
  telephone or radio communication with the
  qualified electrician performing the actual work,
  and when he/she has deenergized and grounded the
  system, can inform the qualified electrician to
  make the repairs.

97
77.808 states,

• Disconnecting devices shall be installed at the
  beginning of branch lines in high-voltage
  circuits and equipped or designed in such a
  manner that it can be determined by visual
  observation that the circuit is deenergized when
  the switches are open.

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77.808 Policy states in part,...

• Visual observation, as referred to in this
  Section, means that a physical separation in the
  current-carrying parts of the disconnecting
  device can actually be seen.
• Enclosed circuit breakers, oil-filled cutout
  switches, and other devices which do not have a
  visual means of determining that the circuit is
  deenergized do not meet the requirements of this
  Section.

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77.808 PPM cont.

• A cable coupler or other device that is not
  designed for load-break purposes is not
  acceptable as a disconnecting device unless it is
  used in conjunction with a current-interrupting
  device such as a circuit breaker or oil-filled
  cutout which can be used to deenergize the
  circuit before the cable coupler of other device
  is opened.

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77.808 PPM cont.

• If a remote switch in the ground check circuit is
  used to trip a circuit breaker prior to
  uncoupling the coupler, visual or audible
  evidence must be provided to indicate that the
  circuit breaker has opened when the control
  switch is operated.

101
77.903 states,

• Disconnecting devices shall be installed in
  circuits supplying power to portable or mobile
  equipment and shall provide visual evidence that
  the power is disconnected.

102
77.903 Policy, Disconnecting Devices

• Visual evidence, as used in this Section, means
  that a physical separation of the
  current-carrying parts of the disconnecting
  device can actually be seen.

103
77.903 PPM cont.

• Consequently, molded-case circuit breakers are
  not acceptable as disconnecting devices. A
  connecting plug on the outby end of a cable with
  which the cable is connected to the power source
  box shall be accepted as a disconnecting device.
  Other visible disconnecting means, such as
  switches with visibly open contacts, will also
  meet the requirements of this Section.

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77.404 (c) states,

• Repairs or maintenance shall not be performed on
  machinery until the power is off and the
  machinery is blocked against motion, except where
  machinery motion is necessary to make
  adjustments.

105
77.404 (c) Policy states in part,...

• MSHAs policy on Paragraph (c) of this section
  is similar to the policy on Section 77.500, which
  states that it is not necessary to completely
  deenergize large surface mining equipment where
  means are provided in the equipment to deenergize
  any part where repair work is to be done.

106
77.404 (c) PPM cont.

• Similarly, to comply with Paragraph (c) , it is
  not necessary to completely deenergize large
  surface mining equipment where the motion of the
  operating equipment does not pose a hazard, and
  means are provided in the equipment to deenergize
  that part where the repair or maintenance work is
  to be done.

107
77.404 (c) PPM cont.

• Each repair or maintenance job must be examined
  separately for hazards related to that particular
  job or area. If the machines operation poses a
  hazard to the employee performing the work, the
  machine shall be shut down until the work is
  completed or the hazard no longer exists.

108
77.404 (c) PPM cont.

• General maintenance and housekeeping can normally
  be performed while the machine is in motion
  except around unguarded energized electric or
  moving mechanical equipment.

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To Prevent Electrical Fatalities and Accidents

• Properly assess task to be performed and
  communicate!
• Team work. Never troubleshoot alone!
• Always lock out and tag the circuit or equipment
  before making any repairs!
• Always use equipment rated for circuit voltages!
• Always wear proper personal protection!
• Remember, its your life that is on the line!

110
Total Electrical Fatalities

• 1970-Present
• 242 total electrical fatalities

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Five Steps To Safety

• Turn equipment off and disconnect the energy
  source
• Lock and tag energy source (electrical,
  mechanical, pneumatic, hydraulic, etc.)
• Release energy in charged conductors, pipes, and
  etc.
• Test the equipment to assure energy source is
  isolated
• Restore energy safely

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