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Electrical Safety-Qualified Person. Energized exposed electrical parts. Exposed parts Live or energized parts De-energized parts. 1a. Energized exposed electrical parts. Exposed parts that are de-energized, but not locked/tagged are considered energized, exposed parts. 1b.

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energized exposed electrical parts
Energized exposed electrical parts
  • Exposed parts
  • Live or energized parts
  • De-energized parts

1a

energized exposed electrical parts3
Energized exposed electrical parts
  • Exposed parts that are de-energized, but not locked/tagged are considered energized, exposed parts

1b

working near exposed parts
Working near exposed parts
  • Only qualified workers can work on or near exposed electrical parts

2a

working near exposed parts5
Working near exposed parts
  • Live parts operating at less than 50 volts to ground do not need to be de-energized when:
    • the worker experiences no increased exposure to electrical burns or explosions due to electrical arcs

2b

working near exposed parts6
Working near exposed parts
  • Lockout/tagout must be performed by a qualified person
  • Who is considered a qualified person?

2c

working near exposed parts7
Working near exposed parts
  • Types of excluded electrical work:
    • general, transmission, distribution installations
    • communications installations
    • vehicle installations
    • railway installations

2d

distinguishing exposed live parts from other parts
Distinguishing exposed live parts from other parts
  • Qualified persons use voltage testing equipment to identify live and de-energized parts
  • Testing equipment must be rated for the anticipated voltages to be tested

3a

nominal voltage of exposed live parts
Nominal voltage of exposed live parts
  • Nominal voltages are values assigned to circuits to designate its voltage class
    • 120/240
    • 480Y/277
    • 600

4a

nominal voltage of exposed live parts10
Nominal voltage of exposed live parts
  • The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation
  • Multi-meters/volt-ohm meters identify voltage

4b

clearance distances unguarded energized overhead lines
Clearance distances - Unguarded/energized overhead lines
  • The required distance between the workers and a conductive object that they could contact

5a

clearance distances unguarded energized overhead lines12
Clearance distances - Unguarded/energized overhead lines
  • Used when working below unguarded, energized lines

5b

clearance distances unguarded energized overhead lines13
Clearance distances - Unguarded/energized overhead lines

Exceptions to required distances:

  • The worker is wearing insulated equipment

5c

clearance distances unguarded energized overhead lines14
Clearance distances - Unguarded/energized overhead lines

Exceptions to required distances:

  • The energized part is insulated from the worker, and all conductive parts at a different potential

5d

clearance distances unguarded energized overhead lines15
Clearance distances - Unguarded/energized overhead lines

Exceptions to required distances:

  • The worker is insulated from all conductive objects at a different potential than the energized part

5e

clearance distances overhead lines and vehicles equipment
Clearance distances -overhead lines and vehicles/equipment
  • Voltages 50 kv or less, the clearance distance is 10 feet
  • Voltages greater than 50kv, the clearance is 10 feet plus 4 inches for every 10 kv over 50 kv

6a

clearance distances overhead lines and vehicles equipment17
Clearance distances -overhead lines and vehicles/equipment
  • When the vehicle is in transit, and the structure is lowered:
    • the clearance distance is 4 feet for 50 kv or less; or
    • 4 feet plus 4 inches for every 10 kv over 50 kv for voltage greater than 50 kv

6b

clearance distances overhead lines and vehicles equipment18
Clearance distances -overhead lines and vehicles/equipment
  • Insulating barriers
    • When installed but not attached to a vehicle, the clearance distance is the designed working dimensions of the barrier
  • Refer to Table S-5 for aerial lift clearance distances

6c

clearance distances overhead lines and vehicles equipment19
Clearance distances -overhead lines and vehicles/equipment
  • Employees must not come into contact with vehicles/equipment under an energized line unless the:
    • employee is wearing proper PPE
    • equipment/vehicle is located so that no uninsulated part can provide a conductive path to employees

6d

clearance distances overhead lines and vehicles equipment20
Clearance distances -overhead lines and vehicles/equipment
  • Do not stand near grounding locations for intentionally grounded equipment/vehicles when contact with overhead wires is possible
    • Insulation and barriers

6e

illumination
Illumination
  • Do not enter an area containing exposed energized parts unless the area is illuminated
  • Do not work near exposed energized parts unless the area is properly illuminated
  • Do not reach into blind areas

7a

confined spaces
Confined spaces
  • Barriers, shields, and insulation provide protection from energized parts
  • Secure doors, hinged panels to prevent exposure to energized parts

8a

handling conductive materials equipment
Handling conductive materials/equipment
  • Carefully handle conductive materials or equipment that come in contact with your body
  • Prevent contact with exposed energized parts

9a

handling conductive materials equipment24
Handling conductive materials/equipment
  • Carefully handle long, conductive objects in areas containing exposed energized parts
    • Insulation
    • Guarding
    • Materials handling

9b

nonconductive ladders
Nonconductive ladders
  • Portable ladders must have nonconductive siderails if they could contact exposed energized parts
  • Metal ladders can conduct electricity and cause arcing and shocks

10a

hazards of conductive apparel
Hazards of conductive apparel
  • Conductive jewelry and clothing can cause arcing when exposed to energized parts
  • Remove or cover conductive jewelry and clothing to eliminate risk of conductivity

11a

proper handling of cords
Proper handling of cords
  • Don’t raise or lower equipment by its cord
  • Don’t unplug the equipment by pulling on its cord
  • Don’t staple or fasten the cord so as to damage outer jacket

12b

equipment inspection
Equipment inspection
  • Visually check for:
    • loose parts
    • deformed or missing parts
    • damaged jackets or insulation
  • Inspect for internal defectives, such as pinched or crushed outer jackets

12c

equipment inspection30
Equipment inspection
  • Perform inspections prior to beginning each shift
  • Remove defective equipment from service
  • Check the plug and receptacle mating configuration before connecting

12d

flexible cords
Flexible cords
  • Flexible cords with grounding-type of equipment must have an equipment grounding conductor

12e

flexible cords32
Flexible cords
  • Never remove or alter the cord’s grounding pin
  • Never use an adapter with a missing grounding pin

12f

proper methods for plugging unplugging
Proper methods for plugging/unplugging
  • Ensure hands are dry
  • Never pull the plug out by the cord

12h

proper methods for plugging unplugging35
Proper methods for plugging/unplugging
  • Handle cords and equipment with insulating protective equipment when the cord connector is wet
  • Secure locking-type connectors after making connection

12i

circuit breakers and circuits
Circuit breakers and circuits
  • Never use the following to open and close electrical circuits
    • Fuses
    • Terminal lugs
    • Cable connectors
    • Cable splice connections

13a

circuit breakers and circuits37
Circuit breakers and circuits
  • Don’t manually re-energize a circuit without first determining if the equipment and circuit can be safely energized
  • Don’t modify overcurrent protective devices

13b

circuit breakers and circuits38
Circuit breakers and circuits
  • Testing of electrical equipment should be performed by qualified persons only
  • Keep flammables and combustibles away from electrical equipment

13c

protective equipment
Protective equipment
  • Personal protective equipment includes:
    • Headgear
    • Eye and face protection
    • Rubber insulating gloves
    • Rubber insulating sleeves
    • Protective footwear

14a

protective equipment40
Protective equipment
  • Inspect protective equipment to ensure its reliability and safety
  • Use insulated tools/equipment around exposed energized parts

14b

protective equipment41
Protective equipment
  • Protective shields, barriers, insulating materials protect employees from:
    • accidental contact
    • dangerous electrical heating
    • arcing

14c

protective equipment42
Protective equipment
  • Normally enclosed live parts must be guarded during maintenance

14d

alerting techniques
Alerting techniques
  • Signs and markings
  • Barricades
  • Attendants

15a

summary of key points
Summary of key points
  • Definitions
  • De-energized means locked/tagged out
  • Safe distances for clearances between workers and energized lines

16a

summary of key points45
Summary of key points
  • Nonconductive ladders
  • Nonconductive clothing
  • Proper use of cords, plugs, receptacles

16b

summary of key points46
Summary of key points
  • Proper use of electrical equipment around flammables/combustibles
  • Protective equipment
  • Alerting techniques

16c

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