mhs tb electricalhazardawareness

8/12/2019 MHS TB ElectricalHazardAwareness

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www.dmp.wa.gov.au/ResourcesSafety

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Electrical hazard awareness


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What does hazard mean?

Hazard means:

any potential or actual threat to the wellbeing of people,

machinery or environment

Electrical hazard safety means:

taking precautions to identify and control electrical hazards


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Why know about it?

Because failing to take the necessary precautions can lead to:

injury or death

fire or property damage


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What are the safety priorities?

Electrical hazards exist in almost every workplace. Common

causes of electrocution are:

making contact with overhead wires

undertaking maintenance on live equipment working with damaged electrical equipment, such as extension

leads, plugs and sockets

using equipment affected by rain or water ingress


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How do you respond to electrical incidents?

If you come across a person receiving an electric shock:

if possible, disconnect the electrical supply (switch?)

assess the situationnever put yourself at risk

take precautions to protect yourself and anyone else in thevicinity

apply the first aid principles (e.g. DRSABCD)

assess the injuries and move the casualty to a safe area if

required administer first aid if trained

seek urgent medical attention


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Do you want to be a victim?

You could be the victim if you:

dont follow proper procedures around electricity

use electrical equipment improperly

use faulty electrical equipment



What are the types of injuries?

Burns

Shocks

Falls

KEEP SAFE

KNOW HOW TO CONTROL ELECTRICAL HAZARDS



What are the levels of effect of current?

AC current (mA) Effect on human body

1 Slight tingling sensation

2-9 Small shock

10-24 Muscles contract causing you to freeze

25-74 Respiratory muscles can become

paralysed; pain; exit burns often visible

75-300 Usually fatal; ventricular fibrillation; entry &

exit wounds visible

>300 Death almost certain; if survive will have

badly burnt organs and probably require

amputations



What should you do in an electrical emergency?

For low voltage electricity >50 V AC and 110 V DC

remove the source of electricity supply

commence CPR if trained

call the emergency number on site

For high voltage electricity >1000 V

call the emergency number for your site

dont go near the casualty dont touch the casualty or try to free them with anything



Should you report electrical incidents?

Electricity is invisiblethis in itself makes it dangerous

It has great potential to seriously injure or kill

The company has a duty of care to its employees and

contractors Everyone is exposed to electrical hazards, not just electricians

Report all electrical shocks and near misses

ALL EMPLOYEES CAN BE EXPOSED TO ELECTRICALHAZARDS. THEY SHOULD RECEIVE ELECTRICAL HAZARD

TRAINING AT THE COMMENCEMENT OF THEIR

EMPLOYMENT AND REGULAR REFRESHER TRAINING.



Can you protect yourself from electricity?

Dont wear metal objects

Turn power off

Wear appropriate clothing

Dont touch live parts

Dont install or repair electrical equipment

Use qualified personnel

Clean and dry leads and plugs before use

Use PPE



What are other safety measures?

Heed warning signs

Use the right equipment

Study the operation manual

Take care of extension leads

Use only approved extension lamps

Dont pull on leads

Use residual current devicesRCDs

Use the proper fuses and circuit breakers



Regular safety inspections

are a part of YOUR job...

Electrical equipment should be checked each time

before use for defects

If not tagged or the tag is out of date then report it andplace it out of service



Should you be aware of powerlines?

Do you know if there are overhead powerlines on your site?

Do you know where they are located?

Do you know what the safe work clearance is?

Strict regulations are laid down to cover any work that may haveto be performed close to overhead powerlines



What is a powerline corridor?

MSI Regulation 5.28 defines a powerline corridor as the area under

any overhead powerline that has not been properly isolated, and 10

metres either side of the powerline.

It is essential that these areas are respected. They are there for

the safety of everyone Do not store equipment, machinery, buildings

or structures in powerline corridors

Do not construct, fabricate or maintain

structures, buildings, machinery or

equipment in powerline corridors

LOOK UP AND LIVE



Can a powerline be approached safely?

Up to and including to 33 kV

2.3 m when passing underneath and 3 m when passing to the side

Above 33 kV

4 m when passing underneath and 6 m when passing to the side



Who can access substations?

Only trained and authorised personnel may enter and work

inside a substation

To enter a substation you must complete the substation entry

training

Access is restricted for any cabinet with exposed energized parts

ALL ELECTRICAL WORK MUST TO BE RECORDED AND

ENTERED INTO THE ELECTRICAL MINES RECORD BOOK,

AND THE ELECTRICAL SUPERVISOR INFORMED



What are electric shock hazards?

Arc welding can and has killed people in high risk environments

Everyone involved needs to better understand the hazards,

adopt sound practice and use appropriate safety devices

Study and adhere to the Code of Practice: WTIA Tech Note 7-04

Use safety devices such as manual trigger switches and voltage

reducing devices (VRDs)

Under adverse conditions, strive to improve control measures

(e.g. presence of moisture as sweat or rain)


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A welding incident

Assistant hands welder a metal object.

Resultant current is 35 mA

I = V/R = 67/1900 = 35 mA

Result = Assistant survived but welder died


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Do you have permission to dig?

Be aware of the potential hazard from buried electrical cables for

the following activities:

excavation

drilling

trenching

levelling

digging

driving of stakes or pegs

Do not commence excavation work near buried cables unless a

permit has been issued by an authorised person

Do you know what precautionary measures need to be taken?


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What risk assessment?!


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Is this a problem?


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d /R S f t

The key messages are

The risk of electric shock from correctly installed and maintained

power sources is negligible, provided that sensible precautions

are taken by the operator and correct work procedures are

followed

Ensure that the right person is carrying out electrical worklicensed versus competent

Electricity is essential but, improperly used, it can be DEADLY!

To STAY ALIVE, you have to STAY ALERT

mhs tb electricalhazardawareness

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