Basic Electrical Safety (4)

8/12/2019 Basic Electrical Safety (4)

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BASIC ELECTRICAL SAFETY

Course not designed to teach you to

work on electrical equipment.

You will not be qualified to work onelectrical equipment.

If you spot problems with electrical

equipment you should immediatelyreport it to your Supervisor or Project

Engineer.


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Fundamentals of Electrical Hazards

To flow electricity must have a

complete path.

Electricity flows throughconductors.

water, metal, the human body

Insulators are non-conductors.


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The human body is a

conductor. Electricity can and does

KILL.


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More than 3 ma

Painful shock

More than 10 ma Muscle contraction no-let-go

danger

More than 30 ma Lung paralysisusually temporary


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More than 50 ma

Possible ventricular fibrillation (usually

fatal)

100 ma to 4 amps

Certain ventricular fibrillation (fatal)

Over 4 amps Heart paralysis, sever burns



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Have you ever been shocked?

THE BASICS


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Hazards of electricity Electrocution, shock, burns, death


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Minimum distance from overheadlines 10 feet.


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Inspect all electrical tools, extensioncords and equipment

Frayed, cuts, broken wires

Grounding prong missing Improperly applied or missing strain relief


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What is grounding? Protection from electric shock

Normally a secondary protection

measure A ground is a conductive

connection

Between electrical circuit orequipment and earth on ground plane

Creates a low resistance to the earth


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Basic Rules of Electrical Action

Electricity isnt live until currentflows.

Electrical current wont flow untilthere is a complete loop, out from

and back to the power source.


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Electrical Protection

Circuit Breakers Provided to protect EQUIPMENT not

people.

Do not reset breakers with a line voltage

higher than 120V and only reset if you

know why it tripped.
http://www.picsearch.com/info.cgi?q=electrician&cid=782128457323&start=129


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Electrical Protection

Distance

If you sense the

presence of anelectrical hazard or

exposed conductors

that may be energized,

keep your distance and

STAY AWAY.


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DOs and DONTs

Do plug power equipment into wallreceptacles with power switches in

the OFF position.


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DOs and DONTs

Do unplug electrical equipment bygrasping the plug and pulling. Do not

pull or jerk the cord to unplug the

equipment.


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DOs and DONTs

Do not drape power cords over hotpipes, radiators or sharp objects.

Do check the receptacle for missing

or damaged parts.


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DOs and DONTs

Do not plug equipment into defectivereceptacles.

Do check for frayed, cracked, or

exposed wiring on equipment cords.


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DOs and DONTs

Do check for defective cord clamps atlocations where the power cord

enters the equipment or the

attachment plug.
http://www.ctelectrical.com/


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DOs and DONTs

Avoid overloading circuits by havingtoo many tools or appliances running

at the same time.


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DOs and DONTs

Employees should know the locationof electrical circuit breaker panels

that control the equipment and

lighting in their respective areas.Circuits and equipment disconnection

must be identified.


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DOs and DONTs

Temporary or permanent storage ofany materials must be allowed within

3 feet of any electrical panel or

electrical equipment.


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DOs and DONTs

Any electrical equipment causing shocksor with high leakage potential must

be tagged with a Danger Tag or the

equivalent.


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DOs and DONTs

Electrician to conduct a monthly colorcoding scheme to ensure the safety

of the worker and prevent any further

damage to equipment. Only certified electricians are allowed

to repair electric driven apparatus.

Report to immediate Superior if found

any defects on the electrically

powered equipment or tools.


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ELECTRICAL INJURIES

Skin Burns Muscle Contraction

Muscular Pain

Hearing Impairment

Respiratory Failure

Cardiac Arrest

Unconsciousness

Fatality


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If someone suffers fromElectric Shock

DO NOTtouch the casualty with your

unprotected hands or any part of your

body. Break the contact by switching off the

current, energizing the plug or

wrenching the cable free. Switch off the current and pull out the

plug before touching the casualty.


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If this is not possible, use something

dry to move the casualty.

Use a wooden or plastic implement to free thecasualty from contact with the electrical source

Wear rubber or plastic insulating gloves, if

available, to pull the casualty free

If rope is available, without touching the

casualty, loop it around the feet or under the

arms and pull the casualty free


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Ensure there is no more danger, if the

casualty seems unharmed, rest and

reassure them and refer to a doctor ora nurse.

Check casualtys breathing and pulse.

Seek first aid/medical helpimmediately.


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Myths and Misconceptions

Electricity takes the path of leastresistance.

Electricity wants to go to ground.

If an electric tool fall into a sink ortub of water, the item will short out.


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Myths and Misconceptions

It takes high voltage to kill; 120 Voltsis not dangerous.

Double insulated power tools aredoubly safe and can be used in wetand damp locations.


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SAFETY FIRST

THE SAFE WAY IS

THE BEST WAY

Basic Electrical Safety (4)

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