You shall be able to identify:
The injuries and fatalities while working near
Basic electrical principles.
Workers at risk.
Basic electrical hazards. Safe work practices
associated with electricity.
Crane contacts electrical lines;
causes fire; tires begin to burn
Each year contact with overhead power lines
result in fatalities, serious injury and property
Unintentional contact with overhead power lines
resulted in the following:
Based on accident statistics in one state
19 serious accidents from July 1999
through September 2005.
Based on national statistics (NSC–2004)
309 fatalities occurred from 1999 to 2001.
These statistics only represent facts
that have been reported to these
agencies; the actual number of fatalities
and suffering are far greater.
Electricity - The Dangers
About 5 workers are
electrocuted every week
Causes 12% of young
worker workplace deaths
Takes very little electricity
to cause harm
Significant risk of causing
Fact: an electrical
excess of 35,000
This is hot enough
to vaporize steel.
Electrical Shock Injury;
Note entry and exit point
These accidents can
be prevented with
and worker safety
training and better
coordination of work
with all utilities
Equipment operators of mobile
equipment, dump trucks, drill rigs, cranes, etc.
and employees who work around this equipment
Emergency service personnel who respond to
car crashes involving power poles and overhead
lines, downed power lines, respond to fires
involving electrical lines near structures
Employees working from ladders
Employees working with electrical equipment
Employees working from roofs where
power lines enter building
Employees who work from scaffolds
Employees who work from Man lifts or
bucket trucks around power lines
And Any employee who is near overhead
power lines for any reason such as tree
trimmers, highway workers, forklift
An electrical shock is received when electrical
current passes through the body.
You will get an electrical shock if a part of your
body completes an electrical circuit by…
Touching a live wire and an electrical ground, or
Touching a live wire and another wire at a
Estimated Effects of AC Currents
(U.S. Standard 60 Hz)
16 mA Maximum current an average
man can grasp and “let go”
20 – 30 mA Paralysis of respiratory
100 mA Ventricular fibrillation
2 Amps Cardiac standstill and internal
Common U.S. household
the path by
Dangers of Electrical Shock
Currents greater than 75 mA*
can cause ventricular
fibrillation (rapid, ineffective
Will cause death in a few minutes
unless a defibrillator is used.
75 mA is not much current – a
small power drill uses 30 times
as much current.
Defibrillator in use
Fundamentals of Electrical
To flow electricity must have a complete path.
Electricity flows through conductors
the human body
Insulators are non-conductors.
The human body is a conductor.
There are four main types of electrical injuries:
Electrocution or death due to electrical shock
Indirect - Falls
Most common shock-
Occurs when you touch
electrical wiring or equipment
that is improperly used or
Typically occurs on hands.
Very serious injury that
needs immediate attention
Hit live wire changing a light
ballast; lost right index finger
High Voltage Electricity Follows the
Path of Least Resistance to Ground
High Voltage Electricity Follows all Paths to
Electrical Damage to the Body
If you touch a power
line, electricity will
attempt to travel
through your body
When electricity travels
through the body, it
heats up and burns
body tissue internally
Electricity leaves the
body violently, causing
burns or even blowing
an exit hole
from an aerial
Possibly Dead Wrong! Electricity Travels at the
speed of light, 186,000 miles per second.
If you touch another person that is in contact
with a high voltage wire you will instantly
become part of the electrical circuit.
You Can Safely Shove a Person Away From
Contact With an Energized Power
Car and Truck Tires Are Made of Rubber and Are
Tires contain Carbon Black. Carbon Black is a
conductive material used to make the tires conductive
for a better radio signal and to make them last longer.
If an overhead electrical line falls upon your vehicle stay
on or inside the vehicle if at all possible.
If you must leave your vehicle do not touch the vehicle and
ground at the same time.
Jump clear and Keep both feet together and hop away.
I Can Safely Use a Tree Limb To Move an
Tree limbs are conductive. Fresh tree limbs are
very electrically conductive due to the moisture
High voltage electricity will conduct through most
items that have contamination or moisture.
Overhead Powerlines Laying on the Ground Are
Safe To Be Near.
Just because a power line is laying on the ground
does not mean it is not energized.
Always consider downed power lines live!
High voltage electricity can enter the ground from
the power line.
This can create different electrical potentials near the
wire that could cause electrocution by contact through
I Can Look-Up and Estimate the Distance to The
Few people have the ability to judge vertical
Don’t take a chance with your safety and the
safety of those working around you.
Call the owner of the powerlines at least 72
hours prior to working within 50 feet of
energized overhead power lines.
I’ve Been Shocked by Electricity Before, So I
Know What Electricity Will Do.
Unless you have seen the destructive
power of High Voltage Electricity first hand
you have no idea what it can do to
material, objects and to people compared
to household voltages.
A Powerline Falls Across Your Vehicle, You
Should Not Try to Drive Away.
You should try to drive away if at all possible.
If your vehicle will not start stay inside and warn
others to stay away until an electrical line worker tell
you it is safe to leave the vehicle.
Scaffold Too Close to Power Lines
• The possibility of
electrocution is a
working near power
• Check the clearance
distances listed in
Ladder Too Close to Energized
If using ladders where
the employee or the
ladder could contact
they must have
such as wood or
This is an unsafe condition
It’s up to you to prevent contacts