39 Questions
What is the primary objective of Chapter 4 in the Western Canada Mine Rescue Manual?
To educate rescuers on responding to emergencies involving electrical equipment
What is the main reason behind many injuries and deaths due to exposure to electricity?
High voltage and amperage
At what voltage do transmission lines typically operate?
69,000 volts to 500,000 volts
What effect does moisture on the skin have on the body's resistance to electricity?
Decreases the body's resistance
What is the purpose of stepping up voltage for efficient transmission over long distances?
To minimize energy loss during transmission
What type of injuries can result from electrocution at heights?
A fall that can further injure the casualty
How does contact with low voltages pose a danger?
It can lead to severe burns
What factor lessens the effect of electricity when partially insulating the body with dry clothing?
The body's resistance to electricity
What is the primary source of electricity generation mentioned in the manual?
Power plants
What is one of the special considerations for emergencies involving electrical equipment?
Do not attempt rescue without proper training
What is the force that causes the flow of electricity and is measured in volts?
Voltage
Which unit is often used to express the difference in electrical potential for higher voltages?
Kilovolts
What refers to a current flowing only from positive to negative?
Direct Current (DC)
What is measured in ohms and is similar to the effect of friction on the flow of water in a pipe?
Resistance
Which material conducts electricity in such small quantities that it cannot normally be detected?
Insulator
What is the term for a sudden release of electrical energy bridging a gap between two conductors?
Arcing
What causes loose connections and overloaded electrical conductors or motors to overheat?
Arcing
Which unit of measurement is used for current and can be compared to the rate of water in a pipe?
Amperes
What refers to when a current in a circuit reverses polarity or changes direction in current flow 60 times per second?
Alternating Current (AC)
What is the process of mechanically connecting isolated wires and equipment to the earth, with sufficient capacity to carry the fault current?
Grounding
What is the probable effect on the human body when exposed to a current of 1mA?
Slight tingling sensation
At what current level does an average individual begin to lose muscular control and experience the freezing current or 'Can't let go' range?
Painful shock, begin to lose muscular control
What is the effect on the human body when exposed to a current of 100mA–2000mA?
Death is likely
What are the factors affecting the severity of injury when dealing with electrical emergencies?
Path of electricity through the body, degree of skin resistance, voltage, frequency AC/DC
What can cause arcing or overheating of electrical equipment?
Wear or other deterioration, improper installation, inadequate maintenance
What should be done if a fallen wire lies under a vehicle with occupants and the operator is unhurt and can move the vehicle?
Instruct the operator to move the vehicle clear of the wire and clear of any pools of water which may be energized by the live wire.
What is a potential hazard for welders according to the text?
"Weld, Cut, or Braze" using electrical systems
What is a major cause of fatalities for crane operators according to the text?
"Contact with overhead power lines"
What should emergency personnel do if a fallen wire lies across a vehicle with occupants and the operator is injured and cannot move the vehicle?
Instruct occupants to stay where they are until electrical crews arrive.
What precaution should operators of ground engagement tools take when trenching and excavating near buried power and communication lines?
Use lock-out/tag-out devices and establish an exclusion zone to eliminate the hazard
What should rescue teams do when arriving at the scene of an incident involving power lines?
Stage response vehicles at a distance to avoid exposure to electrical hazards
What should be established equal to the length of the distance between two poles in all directions from downed power lines?
An exclusion zone
What should mine rescue teams ensure before conducting rescue operations during electrical emergencies?
That energy isolation is complete
What action should be taken by personnel working near energy sources as per site-specific isolation procedures?
Guard against electrical shocks, burns, and eye injuries from electrical arcs
What should be done to eliminate unauthorized access and prevent exposure to electrical hazards at an incident scene?
Control the incident scene
What should be used when working near energy sources as per site-specific isolation procedures?
Lock-out/tag-out devices
"Always assume that all electrical wires and equipment are energized until proven otherwise". What precaution does this statement emphasize?
"Always keep a safe distance from electrical wires and equipment"
"Be aware that wire-mesh, chain-link, barbed wire, and steel-rail fences can be energized by wires outside of your field of view". What precaution does this statement highlight?
"Be aware and exercise caution around fences as they can conduct electricity"
Why is it important to establish an exclusion zone equal to the length of the distance between two poles in all directions from downed power lines?
To prevent unauthorized access and exposure to electrical hazards
Test your knowledge about the effects of electricity on the human body and the potential risks associated with it. Understand the critical paths electricity can take through the body and different scenarios that can lead to serious injury or fatality.
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