Electrical safety

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  • www.CareerSafeOnline.comElectrical Safety

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  • www.CareerSafeOnline.comElectricity is an important part of our modern world and sometimes it is easy to forget just how dangerous it can be.

    Given the correct circumstances, electricity can cause serious injuries or even death. Electrical Safety

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  • www.CareerSafeOnline.comElectrocution is the cause of 12% of all workplace deaths among young workers.

    Electrocution is the third leading cause of work-related deaths among 16 and 17-year-olds.

    Electrical Safety

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  • www.CareerSafeOnline.comThe most common types of electrical injuries are: Electrical shock Electrocution (death due to electrical shock)BurnsFallsElectrical Injuries

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    Touching a live wire and an electrical ground will cause a shock.

    Electrical Shock

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    Touching two live wires of different voltages will cause electrical shock. Electrical Shock

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  • www.CareerSafeOnline.comThe severity of the shock depends on:

    Path of the current through your bodyAmount of current flowing through your bodyLength of time your body is in contact with the circuit

    Electrical ShockLOW VOLTAGE DOES NOT MEAN LOW HAZARD

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  • www.CareerSafeOnline.comBurns are the most common injury caused by electricity. The three types of burns are:BurnsElectrical burnsArc burnsThermal contact burnsElectrical burns can occur when you come into direct contact with electricity.

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    An arc occurs when there is a gap between conductors and current travels through the air. BurnsElectrical burnsArc burnsThermal contact burns

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  • www.CareerSafeOnline.comThermal contact burns can occur when electricity ignites combustible material. Electrical burns Arc burns Thermal contact burnsBurns

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  • www.CareerSafeOnline.comAnother common type of electrical injury is falling.

    Workers who experience a shock on elevated work surfaces such as platforms, ladders or scaffolds can fall resulting in serious injury or death.

    Falls

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  • www.CareerSafeOnline.comTo avoid injuries, you should be aware of electrical hazards. Some of the most common electrical hazards are:

    Exposed electrical partsOverloaded circuitsDefective insulationImproper groundingDamaged power toolsOverhead power linesWet conditionsElectrical HazardsLets take a closer look at each of these hazards.

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  • www.CareerSafeOnline.comExposed electrical parts can include:

    Breaker boxes without a coverElectrical terminals in motors, appliances, and electronic equipment

    Exposed Electrical Parts

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  • www.CareerSafeOnline.comOverloading a circuit increases the potential forfires to occur. Overload hazards exist if:

    Too many devices are plugged into a circuit The wire insulation meltsAn improper overcurrent protection device is used No overcurrent protection device is usedOverloaded Circuits

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  • www.CareerSafeOnline.comOvercurrent protection devices include:

    Circuit breakers Overloaded CircuitsFuses Ground fault circuit interrupters (GFCI)A circuit breaker automatically trips and shuts off the current in a circuit if it becomes overloaded.

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  • www.CareerSafeOnline.comA fuse contains an internal part that melts and shuts off the current if there is an overload.

    Circuit breakers Fuses Overloaded CircuitsGround fault circuit interrupters

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  • www.CareerSafeOnline.comA ground fault circuit interrupter (GFCI) detects current leaking from a circuit to ground and shuts the current off. Circuit breakers Fuses Ground fault circuit interruptersOverloaded Circuits

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  • www.CareerSafeOnline.comDefective InsulationTo protect you, electrical wires are insulated by a plastic or rubber covering. Insulation prevents conductors from coming in contact with each other and with people.

    Make sure the insulation of tools and cords you are using is not damaged.

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  • www.CareerSafeOnline.comGroundingWhen an electrical system is properly grounded, there is a path that allows the current to travel to the earth (the ground).

    When any electrical system isnot properly grounded, a hazardexists.

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  • www.CareerSafeOnline.comPower tools that are damaged or not properly maintained can cause you to be seriously injured.

    If you touch a metallic part of a power tool that is energized because of damaged insulation or improper grounding, you could be shocked. Power Tools

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  • www.CareerSafeOnline.comPower ToolsTo protect you from shock,burns and electrocution, toolsmust:

    Have a three-wire cord with ground and be plugged into a grounded receptacle.Be double insulated.Be powered by a low-voltage isolation transformer.

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  • www.CareerSafeOnline.comOverhead Power LinesOverhead power lines are not usually insulated, and cause more than half of all electrocutions.

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  • www.CareerSafeOnline.comWet ConditionsWet conditions are hazardous because you can become an easy path for electrical current.

    There are many circumstances that create wet conditions:

    Standing in water Wet clothing High humidity Perspiration

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  • www.CareerSafeOnline.comSafe Work PracticesInspect cords before each useNever overload a circuit Stay away from all unguarded conductorsTo unplug, pull on the plug, not the cordDont wear jewelry or use other metal objects around electrical equipment You can StartSafe and StaySafe by usingthe following safe work practices:

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  • www.CareerSafeOnline.comTraining concerning electricity is very important. Training for employees working with electrical equipment must include how to:De-energize the equipmentUse lockout and tag proceduresUse insulating protective equipmentMaintain a safe distance from energized partsUse appropriate PPESafe Work Practices: Training

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  • www.CareerSafeOnline.comSafe Work Practices: Lockout/TagoutTurn off the power supplyPut a lock on all power sources to the circuitApply a tag Test the circuitWhen performing lockout/tagout on circuits, trained employees will do the following:

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  • www.CareerSafeOnline.comSummaryIt is very important to StartSafe and StaySafe around electricity. In order to do so:Know the hazardsPlan your work and plan for safetyAvoid wet working conditions and other dangersAvoid overhead power linesUse proper wiring and connectorsUse and maintain tools properlyWear the correct PPE for the job

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    * * * * * * cause you to be shocked. * * * * * * *

    * * * * *INSTRUCTORS NOTES:Insulation that is defective or inadequate is an electrical hazard. Usually, a plastic or rubber covering insulates wires. Insulation prevents conductors from coming in contact with each other or with people.Extension cords may have damaged insulation. Sometimes the insulation inside an electrical tool or appliance is damaged. When insulation is damaged, exposed metal parts may become energized if a live wire inside touches them. Electric hand tools that are old, damaged, or misused may have damaged insulation inside. If you touch damaged power tools or other equipment, you will receive a shock. You are more likely to receive a shock if the tool is not grounded or double-insulated. (Double-insulated tools have two insulation barriers and no exposed metal parts.) You need to recognize that defective insulation is a hazard.

    *INSTRUCTORS NOTES:When an electrical system is not grounded properly, a hazard exists. The most common OSHA electrical violation is improper grounding of equipment and circuitry. The metal parts of an electrical wiring system that we touch (switch plates, ceiling light fixtures, conduit, etc.) should be grounded and at 0 volts. If the system is not grounded properly, these parts may become energized. Metal parts of motors, appliances, or electronics that are plugged into improperly grounded circuits may be energized. When a circuit is not grounded properly, a hazard exists because unwanted voltage cannot be safely eliminated. If there is no safe path to ground for fault currents, exposed metal parts in damaged appliances can become energized.

    Extension cords may not provide a continuous path to ground because of a broken ground wire or plug. If you contact a defective electrical device that is not grounded (or grounded improperly), you will be shocked. You need to recognize that an improperly grounded electrical system is a hazard.

    1910.304(f) Grounding. Paragraphs (f)(1) through (f)(7) of this section contain grounding requirements for systems, circuits, and equipment. (4) Grounding path. The path to ground from circuits, equipment, and enclosures shall be permanent and continuous. *INSTRUCTORS NOTES:Hand-held electric tools present a potential danger because they make continuous good contact with the hand(s).Metallic parts of electric tools and machines can become energized if there is a break i

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