DISCUSSION UESTIONS 1. Worker A makes contact with a live wire and receives a mi
ID: 2079126 • Letter: D
Question
DISCUSSION UESTIONS 1. Worker A makes contact with a live wire and receives a mild shock. 3. Why can birds safely high-voltage power tact with Worker B makes con- rest on shock. the same live wire and receives lines without getting shocked? might Discuss some of a fatal 4. You have been assigned the task of explaining the occur. the reasons why this company lockout procedure to new employees. 2. The victim of death by electrocution is found with outline what you would consider the most effective his fist still clenched firmly way of doing this. ductor around the live con 5. Visit the website of one of the groups involved with he made contact with. What does this indicate? electrical codes and standards. Report on the ser- vice it provides.Explanation / Answer
Worker A makes contact with a live wire and receives a mild shock. Worker B makes contact with the same live wire and receives a fatal shock. Discuss some of the reasons why this might occur.
The main factor for determining the severity of an electric shock is the amount of electric current that passes through the body. This current is dependent upon the voltage and the resistance of the path it follows through the body. Electrical resistance ( R) is the opposition to the flow of current in a circuit and is measured in ohms (). The lower the body resistance, the greater the current flow and potential electric shock hazard.
Body resistance can be divided into external (skin resistance) and internal (body tissues and blood stream resistance). Dry skin is a good insulator; moisture lowers the resistance of skin, which explains why shock intensity is greater when the hands are wet. Internal resistance is low owing to the salt and moisture content of the blood. There is a wide degree of variation in body resistance. A shock that may be fatal to one person may cause only brief discomfort to another.
As per the question when both worker A and B makes contact with the same wire but receives different types of shocks, the reasons are:
These might be some reasons for the worker B to receive fatal shock compared to worker A.
The victim of death by electrocution is found with his fist still clenched firmly around the live conductor he made contact with. What does this indicate?
When a victim died by electrocution his fist still clenched firmly around the live conductor he makes contact, this indicates that the person who is died by the electrical shock is in touch with the live wire of low frequency(50-60Hz) High Ac current.
AC (alternating current) of the common 60-Hz frequency is three to five times more dangerous than DC (direct current) of the same voltage and current value. DC tends to cause a convulsive contraction of the muscles, often forcing the victim away from further current exposure.
The effects of AC on the body depend to a great extent on the frequency: low-frequency currents (50–60 Hz) are usually more dangerous than high-frequency currents. AC causes muscle spasm, often “freezing” the hand (the most common part of the body to make contact) to the circuit. The fist clenches around the current source, resulting in prolonged exposure with severe burns. This is the reason why his fist is still clenched firmly around the live conductor.
Why can birds safely rest on high-voltage power lines without getting shocked?
For the flow of electricity requires a complete path, the flow of electrons is necessarily brief when static charges are equalized between two objects. Without two contact points on the body for current to enter and exit, respectively, there is no hazard of shock. This is why birds can safely rest on high-voltage power lines without getting shocked; they make contact with the circuit at only one point.
In order for electrons to flow through a conductor, there must be a voltage present to motivate them. Voltage as you call is always relative between two points. There is no such thing as voltage on a single point in the circuit, and so the bird contacting a single point in the above circuit has no voltage applied across its body to establish a current through it. Yes, even though they rest on two feet, both feet are touching the same wire, making them electrically common. Electrically speaking, both of the bird's feet touch the same point; hence there is no voltage between them to motivate current through the bird's body.
This might lend one to believe that it’s impossible to be shocked by electricity by only touching a single wire. Like the birds, if we're sure to touch only one wire at a time, we'll be safe, right? Unfortunately, this is not correct. Unlike birds, people are usually standing on the ground when they contact a "live" wire. Many times, one side of a power system will be intentionally connected to ground, and so the person touching a single wire is actually making contact between two points in the circuit (the wire and ground).
If the bird standing on one wire touches the bird standing on the next wire, then both the birds feel shock and they die. If the man can touch only one wire while flying in air with no earth or other wire contact he will not receive the shock effect.
You have been assigned the task of explaining the company lockout procedure to new employees. Outline what you would consider the most effective way of doing this.
If I has been assigned to explain a lockout procedure to a new employee, first I mainly concentrate on the safety precautions that he must do before coming to any company or and site work. Without the proper knowledge of safety precautions to a new employee, if any problems occur during the operation of the equipment he/she might lose their lives due to lack of proper safety precautions.
Then after I will try to explain the procedure and working of each and every machine or equipment present at that location and I clarify their doubts so that there should be clear mind regarding that working of the equipment. The person with not clear knowledge on the operation will be loss to the entire system.
Then I will explain the entire process from where there are getting the raw data, how much amount or raw data will be consumed per day, like wise I will explain the data regarding the process operation.
Then I will explain the company rules and regulations and what are the Do’s and Don’ts. In this way I explain the company lockout to the new employees.
Visit the website of one of the groups involved with electrical codes and standards. Report on the service it provides.
IEC standards are most commonly available standards for the manufacturing of any electrical equipment and for the design of any insulators, circuit breakers all most all the electrical equipment. Without IEC standards every country has their own standards and their own method of designing the electrical equipment which might be different from other nation’s standards, this may cause problems for exporting or importing any goods from other countries. Every country must look for other country standards if they didn’t match they must order their own design which is not economically accepted. To overcome all these difficulties all the countries has to follow the IEC standards for their design and installing and testing the electrical equipment.
IEC standards has it service in almost every country and they are accepted internationally and IEC standards are not only meant for electrical equipment all the engineering braches follow the IEC standards for their design and manufacturing.
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