Transcript Electrical Safety

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Purpose
Power lines
Equipment
Assured Grounding
GFCI
Conclusion
The purpose of this program is to reduce the potential
for injuries and fires from commonly used temporary
120 volt power systems
This program applies to all cord sets, receptacles (that
are not part of the permanent wiring of a project
building), and equipment connected by cord and
plug.
• Approximately 5 workers are
electrocuted every week
• 12% of young worker workplace deaths
are caused by electrocution
• Takes very little electricity to cause harm
• Significant risk of causing fires
• Power lines should be noted during the Pre-job
inspection
• Evaluate job sites before beginning work
– Determine the safest areas for material loading
– The best placement for materials during operations
– The size and type of materials to be used
• Note any issues on Fall Protection Plan
• Know the location and voltage of all overhead power
lines at the job site before operating or working with
any crane
• Always assume power lines are energized
• Usually not
insulated
• Could have contact
with ladders or
crane
• Do not setup a
crane within 25 feet
of power lines
• Operate the crane at a slower
rate when you are near lines
• Exercise caution when
traveling over uneven ground
that could cause the crane to
weave or bob into power lines
• Keep all personnel well away
from the crane whenever it is
close to power lines
• Prohibit persons from
touching the crane or its load
until a signal person indicates
that it is safe to do so
• Installed by the power
company or certified
electrician
• Done prior to starting
the project
• Employees are not
approved to blanket
lines
Reinforced EPDM has metals strands
Do not use for blanketing
• Notify customer of Power lines and what is needed
– Start date of project
– Lines that need protection and why
– Power Company involvement to blanket lines
• Blankets are installed only by the power company
• Electrical lines can also be de-energized
– Sometimes not practical because the customer loses
power until the lines are turned back on
• Temporary fix and is
the minimum
protection
• Place at least 10 feet
back
• Work can not take
place in the section
• Another form of
protection must be
used
• Plywood at least 3/4
inch thick
• No need for power
company
• Allows work to
continue safely
Wood is a poor conductor of electricity and
will prevent an electrical path to the EE
• Be aware of lines
• Aluminum ladder
are good conductors
• Never setup a ladder
that will come in
contact with lines or
put you near them
Failure to setup the ladder correctly will result in
disciplinary action!
• All extensions must
have a ground prong
• Remove cord from
service immediately
• Fix cord or destroy
• Removed cord from
service
• Fix the cord or
destroy it
– Repair damaged area
– Make 2 cords with
new ends
– Remove from service
Step 1: Cut a piece of cord
longer than the area being
repaired
Step 3: Wrap one layer of black
electrical tape around new sheath
Step 2: Split cord, remove wiring
and wrap insulation around
damaged area
If copper is exposed that
section of cord must be cut
out completely and made
into 2 cords or be disposed
of
Disconnect from
Power Source
Remove
Damaged End
Strip away the
insulation
Attach the new
end making sure
the positive,
negative, and
ground match the
old end.
Fasten screws on
the new end
making sure that
the insulation is
completely inside
Test the cord.
• Check cords and equipment for:
– Frayed or damaged insulation
– Crushed cable
– Heat (hot tar)
– Loose or missing screws or covers
– Missing prongs on plugs
Equipment found to be damaged or defective shall not be used
until they are properly repaired by a competent person
A Ground Fault Circuit Interrupter (GFCI) is a
device used in conjunction with electrical
equipment that shuts down the power to that piece
of equipment if an over-current or ground fault is
detected. There are two buttons on GFCI’s:
• Test - This button allows for the testing of the GFCI to
determine if the device functions properly - When pressed
the button should stop power to any piece of equipment
plugged into the GFCI
• Reset - This button will reset the GFCI whenever a ground
fault is detected or after performing a test
All 120 volt receptacle outlets shall have approved
ground fault protection
• Must be placed at power
source to protect power tools
and extension cords
• Check GFCI daily with
“Test” and “Reset” buttons to
ensure proper function
Any GFCI outlet (i.e. Generators) does not
require the use of an additional GFCI
Store all pieces of electrical equipment away from
the elements as much as possible.
• Store power cords and equipment in a job box unless the individual
piece of equipment has its own case
• Generators should be covered with plastic that is weighted or tied
in somehow to the generator, or stored under a section of roof that
will provide sufficient protection
• Power lines must be protected at all times
• Do not set up ladders near power lines
• Repair or replace any damaged electrical
cords or tools immediately
• Use caution when working with
electricity