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Basic Electrical Safety

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					Basic Electrical Safety


By Greg Bock
PLU Electrician
Why Bother?
 In 1997, over 12,000 people went to hospital
  emergency rooms to be treated for
  electrical shocks and burns.
 Hundreds of workers die every year from
  electrical shock.
 The amount of current to power a 5-watt
  lightbulb is enough to kill three people.
 One of your co-workers was injured last
  year by electricity.
Voltage, Current, Resistance
 Voltage is the pressure or force that
  carries the current.

 Current (amperage) is the amount of
  electricity that flows.

 Resistance slows down the flow of
  electricity.
Current Vs. Resistance
 Metals are good conductors of current
  having very low resistance
 Rubber, ceramics, and wood are poor
  conductors of current with very high
  resistance.
 Materials with high resistance are often
  called insulators.
 The human body can be a very good
  conductor or a very poor conductor.
Factors Affecting the
Conductivity of the Human Body
 Condition of the skin: Is it wet, dry, greasy?


 Health of Individual


 Duration of Contact with Electricity


 Part of the Body contacted
See Do’s & Don’ts Handout
More Do’s & Don’ts
 Keep electrical equipment away from water
  sources
 Use a C-rated fire extinguisher on
  electrical fires and shut off power source
 Remove frayed or damaged equipment and
  cords from service
 Remove plugs by pulling the plug; not the
  cord.
See Extension Cord Handout
Grounding Electrical Equipment
 Grounding functions to conduct current
  leaks to the earth or ground.
 A grounded cord is a 3-wire plug and
  requires a 3-way receptacle.
 Double-insulated equipment does not
  require grounding.
Electrical Shock Injury
Amps Milliamps   Injury
1    1000        Severe burns

0.1    100       Irregular heart beat
                        (requires medical defibrillation)
0.01   10        Cannot release grip

0.001 1          Threshold of sensation
See Electrical Shock Handout
Summary
 Even low   voltage electricity can cause
  injury.
 Your body can be a good conductor of
  electricity, especially when wet.
 Follow the Ground Rules of electricity.
 Do not use defective equipment.
Electrical Safety


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posted:8/21/2011
language:English
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