EES-101 Electrical Safety

What one strategy does OSHA mandate above all others with regard to minimizing the risk of injury from an electrical hazard?

• Personal protective equipment

• De-energization

• Work practices

• Job planning

The meter must be tested on a known voltage source both before and after it is used to verify de-energization.

• True

• False

At what voltage does OSHA establish that the voltage is high enough to pose a threat to a person if they make contact with energized parts?

• 100 volts

• 30 volts

• 120 volts

• 50 volts

At what current level does the heart run the risk of going into ventricular fibrillation?

• 75 milliamperes

• 20 milliamperes

• 5 milliamperes

• 30 milliamperes

The Occupational Safety and Health Administration was created by Congress in 1971 and serves a mission to:

• provide personal protective equipment.

• develop industry consensus standards.

• ensure safe and healthful workplaces in the United States.

• guarantee a workplace free from all hazards.

OSHA is only concerned with electrical hazards within the workplace.

• True

• False

What special type of clothing are workers required to wear when performing energized tasks on high-power equipment, such as motor-control centers and switchgear?

• Arc-rated clothing

• Flame-resistant clothing

• Limited flammability clothing

• Long-sleeve cotton work shirt

What type of personal protective equipment is commonly worn by electricians to prevent shock when they must perform work on or near electrical equipment that has not been de-energized?

• Safety glasses

• Hearing protection

• A Class E hard hat

• Rubber insulating gloves with protectors

True or False: A properly installed and maintained GFCI will prevent an individual from experiencing any shock at all, if they contact a protected circuit.

• True

• False

AFCIs operate by monitoring the connected circuit for signs that electrical current is arcing between conductors in either a parallel or a series arcing fault or, as in the case with combination type, both series and parallel. In a series arc, how much of the circuit current is involved in the arc fault?

• Roughly 80% of the circuit current

• 100% of the normal circuit current

• None of the normal circuit current

• Roughly 300-400% of the circuit current