This document provides guidance on electrical safety. It defines electrical hazards such as shock, arc, and blast. It outlines responsibilities and safe work practices for working on energized circuits, including having another person present for emergency reporting. Affected employees are trained to recognize electrical hazards and use proper safety techniques. The document discusses factors that influence injuries from electric arcs such as distance, absorption, temperature, and time. It provides tips for avoiding shock such as using GFCIs, inspecting equipment, and not handling electrical devices with wet hands.

1. AF
S
AL
ICNNEL
TR SO
C D PER
LECTE
E FFE
A
TY
E
T
NG
NI
AI
R

3. Electrical Standards
• OSHA CFR 1910 Subpart S
• NFPA 70E

4. Scope
• Establish guidelines where reasonable
and adequate methods are utilized to
assure protection from Electrical
Shock, Arc, and Blast hazards for
employees and contractors who are
required to perform work in vicinity of
exposed, or energized circuits.

5. Responsibility
• An effective electrical safety program
is important. You must have a clear
understanding of the program, use
safe work practices, and involve
affected employees in the program.
• Your Maintenance Manager is
responsible for safety planning and
authorizing work on live electrical
equipment.

6. Definitions
Affected Employees
• Employees who, in the course of
performing their assigned tasks,
come in contact with electrical power
sources, tools, and portable
electrical powered devices generally
found in workplace

7. Definitions
Affected Employees are trained in:
•Ability to recognize potentially hazardous
energy and its potential impact on
workplace conditions
•Proper handling and use of portable
electrical equipment associated with their
job
•Proper techniques for opening and closing
circuits, and necessary procedures to follow
before replacing fuses or resetting breakers
when associated with their jobs

8. Hazards of Electricity
• Shock
• Arc
• Blast

9. Hazards of Electricity
Shock
•Electrical Shock is a physical
stimulation that occurs when
electrical current passes through body
•Its effects depend upon:
 Magnitude of current flow
 Body parts through which
current flows
 General physical condition
of person being shocked

10. Hazards of Electricity
Shock and body part physiology
•Skin
 Has a breakdown voltage
 Burns
•Heart
 75 milliamps affects beating
 Muscle
• Loss of muscular control
• Burns

11. Hazards of Electricity
Arc
•Electric arcing occurs when a
substantial amount of electric current
flows through what previously had
been air. It is an enormous amount of
concentrated radiant energy creating a
high intensity blast

12. Temperature and Heat Data
•Temperature at arc terminals
•
•Curable burn temperature (1/10 sec)•
•Cell death temperature (1/10 sec)
•
•Temperature of burning clothing
•
•Clothing ignition temperature
•Temperature of metal droplets
•
•Temperature at suns surface
35,0000 F
1450 F
2050 F
1,4000 F
7000 F 1,4000 F
1,8000 F
• 9,2600 F

13. Factors Affecting Injuries Due to
Electric Arc
• Distance
 From the electrical source
• Absorption
 Body make up
• Temperature
 Electricity travels faster through cool
air
• Time
 Exposure duration

14. Hazards of Electricity
Blast
•Blast comes from the pressure
developed by the near instantaneous
heating of the air surrounding the arc
and from the expansion of the metal as
it is vaporized.
•Blast hurls people
•Knocks down walls
•Ejects projectiles

15. Hazards of Electricity
Summary of causes for injury and
death
•Injury
 Reflex action can cause falls
 Nerve damage
 Burns
 Blindness
 Loss of hearing
 Organ dysfunction

16. Hazards of Electricity
Causes of Death
•Electrically induced shock causes
fatal;
 Internal and external burns
 Lungs damaged from inhaling
superheated plasma and molten
products
 Heart failure

17. Safe Work Practices
• Live parts operating at 50 volts or above, to which
an employee may be exposed, shall be deenergized before work is done on or near them,
unless employee can demonstrate that deenergizing introduces additional or increased
hazards
• Decision to work energized (other than electrical
measurements) will be made on a case by case
basis after all efforts have been made to deenergize equipment during pre-job safety planning

18. Safe Work Practices
When working on energized parts…
•Energized work performed after all
safety planning for task has been
completed
•Who will be performing the work?
•What additional PPE is required
(insulated gloves, goggles, etc.)
•Document why work could not be
performed under ZES or a predetermined
IES

19. Safe Work Practices
• Prior to beginning work on or near
exposed energized parts, all persons
involved shall be briefed on
precautions
• When work conditions or methods
change that could potentially
compromise safety, additional safety
planning is required

20. Safe Work Practices
• Persons performing work on exposed
energized equipment and parts shall
have at least one other person within
sight or sound, who is knowledgeable
of emergency reporting procedures.

21. Safe Work Zone
• Areas around electrical equipment
with emphasis on those with access
doors and panels must be kept clear
of materials, equipment, or any other
articles that deter access to
electrical equipment.

22. Understanding Electrical Hazards
• Most jobs involve electricity which
creates importance to understand how
to avoid electrical shock
• Numerous types of electrical hazards,
depending on equipment in use.
• While machines have high and low
voltage sources, electrical shocks from
an overloaded transmission line or an
incorrectly grounded power tool,
results can be equally fatal

23. Understanding Electrical Hazards
• When electricity enters the body, it can
effect our heartbeat, brain function, and
breathing possibly causing immediate
death or serious injury
• Under certain conditions, even small
amounts of electricity can cause death.
• Never take any electrical device for
granted.

24. Tips To Avoid Shock
• Ensure all electrical equipment is in
good repair.
• Report problems so equipment can be
repaired or replaced
• Only those authorized and qualified do
repairs on electrical equipment. Fatal
accidents have been caused by poorly
repaired equipment.
• Use only correctly grounded
equipment. Never use a three-pronged
cord missing 3rd prong.

25. Tips To Avoid Shock
• Ensure grounding connections are
secure
• Look for damaged, worn or broken
wires and connections
• Use a Ground Fault Circuit Interrupter
(GFCI) when using electrical equipment
outdoors or in a damp area. Do not use
submerged in water. Do not handle
any electrical equipment, including
cords and plugs, with wet hands.

26. Tips To Avoid Shock
• When unplugging a cord, pull on plug
instead of the cord
• Never use a ladder made of aluminum
or one with metal reinforcement when
doing any electrical work. This
includes changing a light bulb.

27. Tips To Avoid Shock
• Determine if there are overhead
hazards such as power lines and
electrical installations. Take
precautions to avoid contact with
objects such as a ladder, pole or pipe.
• Don’t ever use water on an electrical
fire. Use only extinguishers designed
specifically for electrical fires. Know
where to locate and how to use
extinguishers in your workplace.

28. Home Safety
• Cover unused
electrical outlets to
keep little hands safe

29. Home Safety
• Lock Breaker Panels

30. Home Safety
• Don’t create
unnecessary hazards

31. Home Safety
• Unplug shop lights
before changing bulbs
• Turn off light before
replacing bulb
• Follow manufacturer’s
recommendation for
bulb wattage

32. Home Safety
• Dry your hands
before operating
electrical devices
• Clean up spills

33. Home Safety
• Avoid contacting
electricity in wet
conditions
• Turn off breaker before
handling exterior cords

34. Quiz

35. Electrical Hazards include:
•Shock
•Arc
•Blast

36. Factors affecting injuries due to
electric Arc are:
•Distance
•Absorption
•Temperature
•Time

37. All live parts operating
at 50 volts or above
must be
de-energized
before work can
be performed.

38. Persons performing work on exposed
energized equipment and parts shall
have at least one other person within
sight or sound, who is knowledgeable of
emergency reporting procedures.
True or False
True

39. A metal ladder can be used
when doing electrical work.
True Or False
False

40. Use a Ground Fault Circuit
Interrupter (GFCI) when using
electrical equipment outdoors
or in a damp area.
True or False
True

41. Water is to be used on electrical
fires.
True or False
False

42. What’s wrong with this picture

43. Questions