safety and electricity

8/14/2019 safety and electricity

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SAFETY AND ELECTRICITY


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The regulatory bodies The American National Standards Institute (ANSI) The Institute of Electrical and Electronic Engineers

(IEEE) National Fire Protection Association (NFPA) American Society for Testing and Materials (ASTM) The Occupational Safety and Health

Administration (OSHA)


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steps safety method Think beware Understand your procedure Follow your procedures Use appropriate safety equipment

Ask if you are unsure Do not answer if you do not know


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Electrical hazards can be

caused by

any

of

these:

Faulty electrical tools and equipment

Faulty appliances and wiring

Electrical outlets Switch panels Electric transformers


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Rules of Electricity

Rule One: only travel in a circuit. Rule Two: always travel in the path of least

resistance damaged insulation is hazardous. Rule Three: always try to travel to the ground.


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Two Conditions for Electrocution

Under many conditions the body (skin) has a low

level of resistance to electricity. Wet skin has lower resistance than dry. Thin skin (arm) has a lower resistance than thick

skin (palms). Hence, resistance varies greatly depending on the

circumstances; A minor accident in one set of circumstances can be

lethal in another.

PPE (gloves,

rubber

soled

shoes)

can

prevent

the

flow of electricity through the body.


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What are the Effects of Current on the

Body

i. 12 mAmp minor shocks (can lead to more severe accidents eg fall off roof).

ii. 10 mAmp loose control of muscles and unable to let go of source of shock.

iii. 2527 mAmp Collapse and death.iv. 75300 mAmp for only 0.25 second causes ventricular fibrillation and

are almost all immediately fatal.

Note: 240 Volts ~ 120 mAmp.


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Inspect equipment, cords and fittings for damage prior to use

Turn equipment OFF before connecting to a power supply and before making any adjustments

Make sure cords do not create a tripping hazard

When unplugging equipment, pull on the plug not on the cord

Keep cords away from heat, water and oil. These can damage the insulation

and cause

a shock

Cord with waterproof seal


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Do not use electric tools in wet conditions or damp locations

Do not clean electric equipment with flammable or toxic solvents

Do not carry electrical tools by the power cord

Do not tie power cords in knots Do not plug several power cords into

one outlet When in doubt, always ask your

supervisor


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Static ElectricityReducing Accidents

Pour flammable fluids slowly Bond or earth before working with the

flammable solutions Use metal (conductive) materials to dissipate

the static

electricity


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Workplace Inspection Checklist for Electrical

There are sufficient general purpose outlets (GPOs) for equipment & appliances.

Only switched power boards are used if insufficient GPOs and double adaptors are NOT in use.

All cords, plugs and GPOs are in good condition and are not frayed, exposed or cracked etc.

Extension leads are only used for temporary,

shortterm

power

connections. Electrical leads are away from areas that could

cause damage to the lead, such as hot surfaces

and doorways.


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Workplace Inspection Checklist for Electrical

Leads are secured and not potential trip hazards. All computers/printers/faxes have been

tested/tagged in the last five years. All equipment in damp environments eg

aquarium rooms have been tested/tagged in the last six months.

All other electrical equipment has been tested/tagged

High voltage electrical equipment is clearly labeled with appropriate warning signs.


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