Safety Overview Flashcards
What is the most important rule of electrical safety?
The most important rule of safety is to think. / Always make sure the circuit is de-energized before working on it.
Why should a person work with only one hand when possible?
The worst kind of electric shock occurs when the current path is from one hand to the other, which permits the current to pass directly through the heart.
What range of electric current generally causes death?
A current of 100 to 200 milliamperes passing through the heart generally causes death.
What is fibrillation of the heart?
A condition in which the heart begins to “quiver” and the pumping action stops.
What is the operating principle of a defibrillator?
Currents above 200 milliamperes cause the heart to squeeze shut. When the current is removed, the heart usually returns to a normal pumping action.
Who is responsible for enforcing OSHA regulations?
OSHA requires that an employer have a competent person oversee implementation and enforcement of these standards and procedures.
What is the mission of OSHA?
The mission of OSHA is to ensure safe and healthy workplaces in the United States.
What is an MSDS?
MSDS stands for material safety data sheets, which are provided with many products. They generally warn users of any hazards associated with the product.
A padlock is used to lock out a piece of equipment. Who should have the key?
The person performing the work places the lock on the equipment and keeps the key in his or her possession.
A ladder is used to reach the top of a building 16 feet tall. What distance should the bottom of the ladder be placed from the side of the building?
4 feet.
What is a ground fault?
A ground fault occurs when a path to ground other than the intended path is established.
What is the approximate current at which a ground-fault detector will open the circuit?
A GFCI is designed to protect personnel by opening the circuit when it detects a current difference of approximately 5 milliamperes (0.005 ampere).
Name three devices used to provide ground-fault protection.
Ground-fault circuit breaker, Ground-fault receptacle, and the GFCI extension cord.
What type of fire is Class A?
Class A fires involve common combustible materials such as wood or paper. They are often extinguished by lowering the temperature of the fuel below the combustion temperature. Class A fire extinguishers often use water to extinguish a fire. A fire extinguisher listed as Class A only should never be used on an electrical fire.
What type of fire is Class B?
Class B fires involve fuels such as grease, combustible liquids, or gases. A Class B fire extinguisher generally employs carbon dioxide (CO2), which greatly lowers the temper- ature of the fuel and deprives the fire of oxygen. Carbon dioxide extinguishers are often used on electrical fires, because they do not destroy surrounding equipment by coating it with a dry powder.
