Introduction
Awareness of electrical hazards consists of:
make the public concerned aware of the dangers of electric current.
provide the basics in terms of electrical safety in order to perform electrical tasks safely; whether in the professional or domestic field,
pass the theoretical validation validation test
Generally, people who have not received safety training do not behave in a way that ensures their safety, one of the causes being the invisibility of electrical current. It is necessary to help them:
avoid hurting yourself or others
understand what it means to work safely
become aware of the cost of "non-security"
Définition
Definition : a hazard = a danger
Electrical Hazard
An Electrical Hazard can expose workers
What an electrical hazard can expose workers to.
Clic on the picture to see what an electrical hazard can expose workers to.
Electrical Hazard expose workers
Consequences of an electric shock
What are the possible consequences of an electric shock on the body ?
Fill the gaps
A shock can cause muscle spasms,
A shock can cause cardiac arrest,
A shock can cause burns to tissues and organs ,
A shock can affect the nervous system.
What are the possible consequences of an electric shock on the body ?
Fill the gaps
A shock can cause muscle spasms,
A shock can cause cardiac arrest,
A shock can cause burns to tissues and organs ,
A shock can affect the nervous system.
Quiz:General effects of electric current
The general effects of electric current differ for man, woman and child.
For the same amount of current, women generally have worse symptoms then men.
What is the effect for each current value ?
Electric current (contact for 1s) | Effect |
---|---|
Below 1 mA | |
1 mA | |
5 mA | |
6-25 mA (women) | |
9 to 30 mA (men) | |
50 to 150 mA | |
1 to 4.3 A | |
10 A |
Electric current (contact for 1s) | Effect |
---|---|
Below 1 mA | Not perceptible |
1 mA | Threshold of feeling, |
5 mA | Slight shock. Not painful. |
6-25 mA (women) | Loss of muscle control |
9 to 30 mA (men) | Freezing current, "can't let go". The person may be thrown away from the power source. |
50 to 150 mA | Extreme pain. Respiratory arrest. Muscles reactions. Possible Death. |
1 to 4.3 A | Fibrillation of the heart. Muscular contraction and nerve damage occur. Likely death. |
10 A | Cardiac arrest, severe burns. Death is probable |
Quiz:Vocabulary - part 1
Fill in the list of new vocabulary words on your sheet of paper
To injure / an injury | |
Live parts / live | |
A fault / faulty | |
Ignition | |
Safety procedures | |
A risk assessment | |
To weld / welding | |
Suitable / unsuitable | |
A surrounding area | |
An extention lead | |
To avoid | |
RCD (residual current device) | |
A medical treatment | |
To wire / to be rewired | |
To maim | |
To repair / a repair | |
Plugs/sockets | |
To take for granted |
To injure / an injury | Etre blessé / une blessure |
Live parts / live | Partie sous tension |
A fault / faulty | Défaillant |
Ignition | Allumage |
Safety procedures | Les procédures de sécurité |
A risk assessment | Une évaluation des risques |
To weld / welding | Souder / soudure |
Suitable / unsuitable | Convient / ne convient pas |
A surrounding area | Une zone environnante |
An extention lead | Une rallonge |
To avoid | To avoid |
RCD (residual current device) | DDR (disjoncteur différentiel) |
A medical treatment | Un traitement médical |
To wire / to be rewired | Câbler / être cablé |
To maim | Mutiler |
To repair / a repair | Réparer / une réparation |
Plugs/sockets | Une prise mâle / femelle |
To take for granted | Considérer comme acquis |
Basic notions
Introduction
Safety training should cover:
In the next step, you will have to answer a few questions on basic notions of electrical protection |
Basics of Contact with Electricity
It is the level of voltage the body is exposed to and the resistance to flow of electrical current offered by the body that determines the impact of exposure to electricity. The following factors determine the severity of the effect electric shock has on your body:
Fill the gaps with the flollowing words :
flows
resistance
voltage
path
The level of voltage
The amount of body resistance you have to the current flow
The path the current takes through your body
The length of time the current flows through your body
How Electric Current affects the Body
Electric Current affects the body when it flows through. The basic unit of current is the amp. This is the current which flows through a resistance of 1 ohm (Ω) when a voltage of 1 volt is applied across it. However, currents as low as thousandths of amps (milliamps) can have an adverse effect on the body.
The table below gives an illustration of the types of effects various levels of currents can have on the body.
Accepted as maximum harmless current Temporary respiratory paralysis, possibility of death. Beginning of muscular contraction ("Can't let go" current.) Ventricular fibrillation, fatal if continued. Respiratory function continues. You are starting to feel something |
0,5mA
|
5mA
|
|
10mA
|
|
30 à 75mA
|
|
1A et plus
|
Personal Protective Equipment (PPE)
Personal Protective Equipment (PPE) means any device or appliance designed to be worn or held by an individual for protection against one or more health and safety hazards.
Electrical insulating gloves
|
|
Low voltage detectors
|
|
Insulating mats
|
|
Helmet with integrated face shield
|
|
Insulating boots class
|
The first step to do
If a worker has come into contact with electricity the worker may not be able to remove themselves from the electrical source. The human body is a good conductor of electricity. If you touch a person while they are in contact with the electrical source, the electricity will flow through your body causing electrical shock. What is the first step to do in this case ? |
Basics of Contact with Electricity
The level of voltage
The amount of body resistance you have to the current flow
The path the current takes through your body
The length of time the current flows through your body
How Electric Current affects the Body
0,5mA
You are starting to feel something
|
|
5mA
Accepted as maximum harmless current
|
|
10mA
Beginning of muscular contraction ("Can't let go" current.)
|
|
30 à 75mA
Ventricular fibrillation, fatal if continued. Respiratory function continues.
|
|
1A et plus
Temporary respiratory paralysis, possibility of death.
|
Personal Protective Equipment (PPE)
Personal Protective Equipment (PPE) means any device or appliance designed to be worn or held by an individual for protection against one or more health and safety hazards.
Electrical insulating gloves
|
|
Low voltage detectors
|
|
Insulating mats
|
|
Helmet with integrated face shield
|
|
Insulating boots class
|
The first step to do
Quiz:Vocabulary - part 2
Fill in the list of new vocabulary words on your sheet of paper
A residual current device | |
An earth leakage trip device | |
To be fitted | |
To be damaged | |
To be labelled | |
To overload | |
A socket | |
To be unplugged | |
To be discharged | |
A lockout / tagout |
A residual current device | Un dispositif à courant résiduel |
An earth leakage trip device | Un déclencheur différentiel |
To be fitted | À installer |
To be damaged | Être endommagé |
To be labelled | Installer une pancarte |
To overload | Surcharger |
A socket | Une prise |
To be unplugged | Être débranché |
To be discharged | Être déchargé |
A lockout / tagout | Un cadenassage / étiquetage |
Be prepared to work safely
Electrical Hazards
Watch the video carefully below
To see the subtitles, clic on the gear wheel on the rigth and choose English
Are you prepared ?
Introduction
You have carefully watched the video "Be prepared to work safely". You will be able to answer the following series of quizzes |
Operate electric equipment correctly
If you do not operate electric equipment correctly, what can be the consequences :
Complete the sentences : |
Contact with live parts will result in electric shocks and burns
Ignition can be provoked by a faulty equipment and cause fire or explosion.
Every company should have safety procedures that need to be respected.
Before every job it's essential to : assess potential risks check if equipment is suitable/ safe to use and not faulty / damaged
Wet conditions
How can risks be reduced in wet conditions ? Give examples. You can use : |
Damaged equipment
Fill the gap |
In wet conditions, any damaged equipment can become dead.
Devices
Give a example of devices that can be easily damaged : |
Devices
Give another example of devices that can be easily damaged : |
Damaged equipment
What can develop a damaged equipment ? |
A damaged equipment can develop an electrical fault when you're working in a confined space.
Sockets
Can you overload sockets ? |
Sockets can be overload No
Complete the sentence : |
The safest way is to unplugged electrical equipment before use it and make sure it is fully discharged
Operate electric equipment correctly
Contact with live parts will result in electric shocks and burns
Ignition can be provoked by a faulty equipment and cause fire or explosion.
Every company should have safety procedures that need to be respected.
Before every job it's essential to : assess potential risks check if equipment is suitable/ safe to use and not faulty / damaged
Wet conditions
How can risks be reduced in wet conditions ? Give examples. You can use : |
Damaged equipment
In wet conditions, any damaged equipment can become dead.
Devices
Give a example of devices that can be easily damaged : |
Devices
Give another example of devices that can be easily damaged : |
Damaged equipment
A damaged equipment can develop an electrical fault when you're working in a confined space.
Sockets
Sockets can be overload No
The safest way is to unplugged electrical equipment before use it and make sure it is fully discharged
Conclusion
Conclusion à faire