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    wet hands is a safety hazard while running any experiment or operating any equipment that uses electricity

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    Preventing Electrical Hazards

    Preventing Electrical Hazards

    Common Electrical Hazards and Preventable Steps

    The major hazards associated with electricity are electrical shock and fire. Electrical shock occurs when the body becomes part of the electric circuit, either when an individual comes in contact with both wires of an electrical circuit, one wire of an energized circuit and the ground, or a metallic part that has become energized by contact with an electrical conductor.

    The severity and effects of an electrical shock depend on a number of factors, such as the pathway through the body, the amount of current, the length of time of the exposure, and whether the skin is wet or dry. Water is a great conductor of electricity, allowing current to flow more easily in wet conditions and through wet skin. The effect of the shock may range from a slight tingle to severe burns to cardiac arrest. Table 10.1 shows the general relationship between the degree of injury and amount of current for a 60-cycle hand-to-foot path of one second's duration of shock. While reading this chart, keep in mind that most electrical circuits can provide, under normal conditions, up to 20,000 milliamperes of current flow.

    Table 10.1 Body Reactions Under Effect of Electrical CurrentCurrentReaction

    1 Milliampere Perception level 5 Milliamperes

    Slight shock felt; not painful but disturbing

    6-30 Milliamperes

    Painful shock; "let-go" range

    50-150 Milliamperes

    Extreme pain, respiratory arrest, severe muscular contraction

    1000-4,300 Milliamperes

    Ventricular fibrillation

    10,000+ Milliamperes

    Cardiac arrest, severe burns and probable death

    Adopted from Princeton University Environmental Health and Safety Handbook

    In addition to the electrical shock hazards, sparks from electrical equipment can serve as an ignition source for flammableor explosivevapors or combustible materials.

    Loss of electrical power can create hazardous situations. Flammable or toxic vapors may be released as a chemical warms when a refrigerator or freezer fails. Fume hoods may cease to operate, allowing vapors to be released into the laboratory. If magnetic or mechanical stirrers fail to operate, safe mixing of reagents may be compromised.

    Electric shock

    Electric shock is another hazard common to many pieces of laboratory equipment. Any electrically powered item of laboratory equipment which is subject to spillage of chemicals or water, or exhibit signs of excessive wear should be used carefully.

    Electrical shocks occur when the electrical circuit completed by the part of human body. One way this can occur is by contacting a metallic part of a piece of equipment that has become energized by contact with an electrical conductor. The severity of the electrical shock depends on the following:

    The amount of the current (given as a list above)

    The pathway through the body

    The duration of the exposure

    Whether the skin is wet or dry

    A victim of electrical shock could be knocked unconscious. If the victim is still in contact with the live power source, turn off the live source or press the emergency power cut off button before administering aid. Do not touch anyone that is still in contact with a live power source, as you could be electrocuted as well

    After disconnecting power, administer first aid and/or call Health Center (7666).

    Resistive heating

    Even if an individual survives a shock episode, there may be immediate and long-term harm on tissue, nerves, and muscle due to heat generated by the current flowing through the body. The heat generated is basically resistive heating such as would be generated in heating coils in a small space heater.

    The scope of the effects of external electrical burns is usually immediately apparent, but the total effect of internal burns may become manifest later on by losses of important body functions due to the destruction of critical internal organs, including portions of the nervous system, which is especially vulnerable.

    If a victim has resistive heating burns; you should apply “Burn Kit”, then call Health Center (7666).

    Spark ignition sources

    Induction motors should be used in most laboratory applications instead of series-wound electric motors, which generate sparks from the contacts of the carbon brushes. It is vital to use non-sparking motors in pieces of equipment which result in considerable amounts of vapour, such as blenders, evaporators, or stirrers. Equivalent ordinary equipment or other items such as vacuum cleaners, drills, rotary saws, or other power equipment are not suitable for use in laboratories where solvents are in use. Blowers used in fume exhaust systems should at least have non-sparking fan blades, but in critical situations with easily ignitable vapors being exhausted, it may be worth the additional cost of a fully explosion-proof blower unit.

    Any device in which an electrically live circuit makes and breaks, as in a thermostat, an on-off switch, or other control mechanism, is a potential source of ignition for flammable gases or vapors. Special care should be taken to eliminate such ignition sources in equipment in which the vapors may become confined, as already discussed for refrigerators and freezers. It is also possible in other equipment such as blenders, mixers, and ovens and the use of such devices should not be permitted with or in the vicinity of materials which emit potentially flammable vapors.

    स्रोत : fens.sabanciuniv.edu

    Electrical Safety

    Why is it so important to work safely with or near electricity? What do I need to know about electricity? What kinds of injuries result from electrical currents?

    Electrical Safety - Basic Information

    Electrical Safety - Basic Information Why is it so important to work safely with or near electricity?

    The voltage of the electricity and the available electrical current in regular businesses and homes has enough power to cause death by electrocution. Even changing a light bulb without unplugging the lamp can be hazardous because coming in contact with the "hot", "energized" or "live" part of the socket could kill a person.

    What do I need to know about electricity?

    All electrical systems have the potential to cause harm. Electricity can be either "static" or "dynamic." Dynamic electricity is the uniform motion of electrons through a conductor (this is known as electric current). Conductors are materials that allow the movement of electricity through it. Most metals are conductors. The human body is also a conductor. This document is about dynamic electricity.

    Note: Static electricity is accumulation of charge on surfaces as a result of contact and friction with another surface. This contact/friction causes an accumulation of electrons on one surface, and a deficiency of electrons on the other surface. The OSH Answers document on How Do I Work Safely - Static Electricity has more information.

    Electric current cannot exist without an unbroken path to and from the conductor. Electricity will form a "path" or "loop". When you plug in a device (e.g., a power tool), the electricity takes the easiest path from the plug-in, to the tool, and back to the power source. This is action is also known as creating or completing an electrical circuit.

    What kinds of injuries result from electrical currents?

    People are injured when they become part of the electrical circuit. Humans are more conductive than the earth (the ground we stand on) which means if there is no other easy path, electricity will try to flow through our bodies.

    There are four main types of injuries: electrocution (fatal), electric shock, burns, and falls. These injuries can happen in various ways:

    Direct contact with exposed energized conductors or circuit parts. When electrical current travels through our bodies, it can interfere with the normal electrical signals between the brain and our muscles (e.g., heart may stop beating properly, breathing may stop, or muscles may spasm).

    When the electricity arcs (jumps, or "arcs") from an exposed energized conductor or circuit part (e.g., overhead power lines) through a gas (such as air) to a person who is grounded (that would provide an alternative route to the ground for the electrical current).

    Thermal burns including burns from heat generated by an electric arc, and flame burns from materials that catch on fire from heating or ignition by electrical currents or an electric arc flash. Contact burns from being shocked can burn internal tissues while leaving only very small injuries on the outside of the skin.

    Thermal burns from the heat radiated from an electric arc flash. Ultraviolet (UV) and infrared (IR) light emitted from the arc flash can also cause damage to the eyes.

    An arc blast can include a potential pressure wave released from an arc flash. This wave can cause physical injuries, collapse your lungs, or create noise that can damage hearing.

    Muscle contractions, or a startle reaction, can cause a person to fall from a ladder, scaffold or aerial bucket. The fall can cause serious injuries.

    What should I do if I think I am too close to overhead power lines?

    Do not work close to power lines. Recommended distances vary by jurisdiction and/or utility companies. Check with both your jurisdiction and electrical utility company when working, driving, parking, or storing materials closer than 15 m (49 feet) to overhead power lines.

    If you must be close to power lines, you must first call your electrical utility company and they will assist you.

    If your vehicle comes into contact with a power line:

    DO NOT get out of your vehicle.

    Call 911 and your local utility service for help.

    Wait for the electrical utility to come and they will tell you when it is safe to get out of your vehicle.

    Never try to rescue another person if you are not trained to do so.

    If you must leave the vehicle (e.g., your vehicle catches on fire), exit by jumping as far as possible – at least 45 to 60 cm (1.5 to 2 feet). Never touch the vehicle or equipment and the ground at the same time. Keep your feet, legs, and arms close to your body.

    Keep your feet together (touching), and move away by shuffling your feet. Never let your feet separate or you may be shocked or electrocuted.

    Shuffle at least 10 metres away from your vehicle before you take a normal step.

    Do not enter an electrical power substation, or other marked areas.

    What are some general safety tips for working with or near electricity?

    Inspect portable cord-and-plug connected equipment, extension cords, power bars, and electrical fittings for damage or wear before each use. Repair or replace damaged equipment immediately.

    Always tape extension cords to walls or floors when necessary. Do not use nails and staples because they can damage extension cords and cause fire and shocks.

    Use extension cords or equipment that is rated for the level of amperage or wattage that you are using.

    Always use the correct size fuse. Replacing a fuse with one of a larger size can cause excessive currents in the wiring and possibly start a fire.

    स्रोत : www.ccohs.ca

    Q Why should you not touch electrical appliances with wet hands?A This is because when we wash our hands with tap water which contains a lot of salt and ions this gets transmitted to our hands. When we touch the electrical appliances with wet hands ,the electric current passes from the appliance till our hands due to which we may get electric shock. Could you please check my answer. Do give your inputs.

    Q Why should you not touch electrical appliances with wet hands?A This is because when we wash our hands with tap water which contains a lot of salt and ions this gets transmitted to our hands. When we touch the electrical appliances with wet hands ,the electric current passes from the appliance till our hands due to which we may get electric shock. Could you please check my answer. Do give your inputs.

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    Q Why should you not touch electrical appliances with wet hands?A This is because when we wash our hands with tap water which contains a lot of salt and ions this gets transmitted to our hands. When we touch the electrical appliances with wet hands ,the electric current passes from the appliance till our hands due to which we may get electric shock. Could you please check my answer. Do give your inputs.

    Question

    Q) Why should you not touch electrical appliances with wet hands?

    A) This is because when we wash our hands with tap water which contains a lot of salt and ions this gets transmitted to our hands . When we touch the electrical appliances with wet hands ,the electric current passes from the appliance till our hands due to which we may get electric shock.

    Could you please check my answer. Do give your inputs.

    Open in App Solution

    Yes.you are correct.

    Small amounts of mineral salts present naturally in water are beneficial for human health. However, these salts make water conducting. So, we should never handle electrical appliances with wet hands or while standing on a wet floor.

    Suggest Corrections 32

    SIMILAR QUESTIONS

    Q.

    Why is it dangerous to touch a working electrical appliance with wet hands ?

    Q.

    Why we should not touch the electrical appliances with wet hands? [2 MARKS]

    Q. We should hold electrical appliances with wet hands.Q. We should not repair electric switches and appliances connected to main supply with wet hands becauseQ.

    Why is it dangerous to touch electrical appliances with wet hands?

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    स्रोत : byjus.com

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    Mohammed 9 day ago
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