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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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Electrical Safety-Qualified Person

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Electrical safety qualified person l.jpg

Electrical Safety-Qualified Person


Energized exposed electrical parts l.jpg

Energized exposed electrical parts

  • Exposed parts

  • Live or energized parts

  • De-energized parts

1a


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Energized exposed electrical parts

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

1b


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Working near exposed parts

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

2a


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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


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Working near exposed parts

  • Lockout/tagout must be performed by a qualified person

  • Who is considered a qualified person?

2c


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Working near exposed parts

  • Types of excluded electrical work:

    • general, transmission, distribution installations

    • communications installations

    • vehicle installations

    • railway installations

2d


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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


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Nominal voltage of exposed live parts

  • Nominal voltages are values assigned to circuits to designate its voltage class

    • 120/240

    • 480Y/277

    • 600

4a


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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


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Clearance distances - Unguarded/energized overhead lines

  • The required distance between the workers and a conductive object that they could contact

5a


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Clearance distances - Unguarded/energized overhead lines

  • Used when working below unguarded, energized lines

5b


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Clearance distances - Unguarded/energized overhead lines

Exceptions to required distances:

  • The worker is wearing insulated equipment

5c


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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


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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


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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


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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


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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


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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


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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


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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


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Confined spaces

  • Barriers, shields, and insulation provide protection from energized parts

  • Secure doors, hinged panels to prevent exposure to energized parts

8a


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Handling conductive materials/equipment

  • Carefully handle conductive materials or equipment that come in contact with your body

  • Prevent contact with exposed energized parts

9a


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Handling conductive materials/equipment

  • Carefully handle long, conductive objects in areas containing exposed energized parts

    • Insulation

    • Guarding

    • Materials handling

9b


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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


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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


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Procedures for using portable electrical equipment

12a


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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


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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


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Equipment inspection

  • Perform inspections prior to beginning each shift

  • Remove defective equipment from service

  • Check the plug and receptacle mating configuration before connecting

12d


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Flexible cords

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

12e


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Flexible cords

  • Never remove or alter the cord’s grounding pin

  • Never use an adapter with a missing grounding pin

12f


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Types of electrical equipment and cords to be used near water

12g


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Proper methods for plugging/unplugging

  • Ensure hands are dry

  • Never pull the plug out by the cord

12h


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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


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Circuit breakers and circuits

  • Never use the following to open and close electrical circuits

    • Fuses

    • Terminal lugs

    • Cable connectors

    • Cable splice connections

13a


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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


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Circuit breakers and circuits

  • Testing of electrical equipment should be performed by qualified persons only

  • Keep flammables and combustibles away from electrical equipment

13c


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Protective equipment

  • Personal protective equipment includes:

    • Headgear

    • Eye and face protection

    • Rubber insulating gloves

    • Rubber insulating sleeves

    • Protective footwear

14a


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Protective equipment

  • Inspect protective equipment to ensure its reliability and safety

  • Use insulated tools/equipment around exposed energized parts

14b


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Protective equipment

  • Protective shields, barriers, insulating materials protect employees from:

    • accidental contact

    • dangerous electrical heating

    • arcing

14c


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Protective equipment

  • Normally enclosed live parts must be guarded during maintenance

14d


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Alerting techniques

  • Signs and markings

  • Barricades

  • Attendants

15a


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Summary of key points

  • Definitions

  • De-energized means locked/tagged out

  • Safe distances for clearances between workers and energized lines

16a


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Summary of key points

  • Nonconductive ladders

  • Nonconductive clothing

  • Proper use of cords, plugs, receptacles

16b


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Summary of key points

  • Proper use of electrical equipment around flammables/combustibles

  • Protective equipment

  • Alerting techniques

16c


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