Electrical Safety-Qualified Person

1
Electrical Safety-Qualified Person
2
Energized exposed electrical parts

• Exposed parts
• Live or energized parts
• De-energized parts

1a
3
Energized exposed electrical parts

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

1b
4
Working near exposed parts

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

2a
5
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
6
Working near exposed parts

• Lockout/tagout must be performed by a qualified
  person
• Who is considered a qualified person?

2c
7
Working near exposed parts

• Types of excluded electrical work
• general, transmission, distribution installations
• communications installations
• vehicle installations
• railway installations

2d
8
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
9
Nominal voltage of exposed live parts

• Nominal voltages are values assigned to circuits
  to designate its voltage class
• 120/240
• 480Y/277
• 600

4a
10
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
11
Clearance distances - Unguarded/energized
overhead lines

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

5a
12
Clearance distances - Unguarded/energized
overhead lines

• Used when working below unguarded, energized lines

5b
13
Clearance distances - Unguarded/energized
overhead lines

• Exceptions to required distances
• The worker is wearing insulated equipment

5c
14
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
15
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
16
Clearance distances - Unguarded/energized
overhead lines

• 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
17
Clearance distances - Unguarded/energized
overhead lines

• 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
18
Clearance distances - Unguarded/energized
overhead lines

• 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
19
Clearance distances - Unguarded/energized
overhead lines

• 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
20
Clearance distances - Unguarded/energized
overhead lines

• Do not stand near grounding locations for
  intentionally grounded equipment/vehicles when
  contact with overhead wires is possible
• Insulation and barriers

6e
21
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
22
Confined spaces

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

8a
23
Handling conductive materials/equipment

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

9a
24
Handling conductive materials/equipment

• Carefully handle long, conductive objects in
  areas containing exposed energized parts
• Insulation
• Guarding
• Materials handling

9b
25
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
26
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
27
Procedures for using portable electrical equipment
12a
28
Proper handling of cords

• Dont raise or lower equipment by its cord
• Dont unplug the equipment by pulling on its cord
• Dont staple or fasten the cord so as to damage
  outer jacket

12b
29
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
30
Equipment inspection

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

12d
31
Flexible cords

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

12e
32
Flexible cords

• Never remove or alter the cords grounding pin
• Never use an adapter with a missing grounding pin

12f
33
Types of electrical equipment and cords to be
used near water

• Equipment must be approved
• for use in these types of
• locations.

12g
34
Proper methods for plugging/unplugging

• Ensure hands are dry
• Never pull the plug out by the cord

12h
35
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
36
Circuit breakers and circuits

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

13a
37
Circuit breakers and circuits

• Dont manually re-energize a circuit without
  first determining if the equipment and circuit
  can be safely energized
• Dont modify overcurrent protective devices

13b
38
Circuit breakers and circuits

• Testing of electrical equipment should be
  performed by qualified persons only
• Keep flammables and combustibles away from
  electrical
• equipment

13c
39
Protective equipment

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

14a
40
Protective equipment

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

14b
41
Protective equipment

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

14c
42
Protective equipment

• Normally enclosed live parts must be guarded
  during maintenance

14d
43
Alerting techniques

• Signs and markings
• Barricades
• Attendants

15a
44
Summary of key points

• Definitions
• De-energized means locked/tagged out
• Safe distances for clearances between workers and
  energized lines

16a
45
Summary of key points

• Nonconductive ladders
• Nonconductive clothing
• Proper use of cords, plugs, receptacles

16b
46
Summary of key points

• Proper use of electrical equipment around
  flammables/combustibles
• Protective equipment
• Alerting techniques

16c