# Electrical

Hazardous Energy Release Session Three 3-1 Two Basic Types Energy in motion is Kinetic Energy Radiant Thermal Electrical (Light) Mechanical

Energy that is stored is Potential Energy Coiled spring Raised weight Water behind a dam Snow pack Stretched rubber band 3-2

Hydraulic Force created by liquid under pressure Liquids cannot be compressed They transmit force to surrounding areas 3-3 Pneumatic Air hose may uncouple or a fitting

may fail Rapid expansion of air causes the hose to whip violently Can cause a hazardous situation Whip Check 3-4 -Auger SpinoffPotential or Kinetic?

Rotating Machinery Hazards created by rotating parts & high pressure hydraulics Stay away Rotating parts can snag lose clothing Failure of hydraulic hoses can cause injury 3-5

Electrical Voltage is form of pressure Electromagnetic pressure Qualified Electrical workers use Minimum Approach Distances for protection Wear protective clothing and personal protective equipment 3-6

Electrical Arc Release of stored energy Always identify Line of Fire before starting the task In an arc flash metal is liquefied and vaporized

Projected with large amounts of force At very high speeds 3-7 -Suspended Pole-Stowed AugerPotential or or Potential Kinetic? Kinetic? 2-4 -Electrical Arc FlashPotential or Kinetic? 2-4

-Suspended LoadPotential or Kinetic? 4-4 Summary Critical Questions: Are we or will we be placing ourselves in Harms Way? Are we or will we be placing someone else in Harms Way? What could hit me, us, or them? How are we going to eliminate or control the

hazard? Because our work is dynamic, Lineof-fire hazards are also dynamic Each persons position with respect to line-of-fire must constantly be assessed 3-11 Key Points-Session Three 1. Energy in motion is kinetic energy. a. True b. False

2. Voltage is an example of pressure. 3. a. True b. False An important part of job planning is to identify possible sources of stored energy and determining if workers may be injured if there is a release of that energy.

a. True b. False 4. During the job planning stage it is determined that workers may be exposed to hazardous energy sources, the best protection is to when possible, eliminate the hazard. a. True b.

False 3-12 Review 3-13

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