Arc Flash
According to industrial statistics, what percentage of electrical accidents involve electricians with 8 or more years of experience?
A. 15% | B. 81% | C. 90% | D. 50%
B. 81%
Ω What does this symbol represent?
Ohms - Resistance
What is the minimum amount of current, measured in amperes, that can be fatal to the average human?
0.005A or 5mA
When selecting Personal Protective Equipment (PPE) for electrical work, what material must underclothing be made of, when wearing FR clothing?
All Cotton - No cotton-blend fabrics.
What is the average resistance of human skin used in Ohm's Law calculations within the source material?
10,000
Which path of electrical current through the human body is identified as the most serious?
Through the heart
How does the temperature of an electrical arc compare to the surface temperature of the sun?
4x hotter than the surface of the sun
According to the provided statistics, approximately how many electrical injuries occur annually in the United States?
4,400
Which of the following is categorized as a long-term effect of electrical shock?
A. Cellular Degradation | B. Ventricular Fibrillation | C. Brain-chemical Imbalance | D. Autonomic System Failure
C. Brain-chemical Imbalance - Electrical shock can cause lasting neurological and psychological damage, including changes to brain chemistry.
According to the instruction, an average electrical arc typically lasts for how many cycles?
4-6 cycles
Which range of current is known as the 'freezing current' or 'let-go' range, where muscular control is lost?
6-30mA
Which level of current is almost certain to cause cardiac arrest, severe burns, and death?
10,000mA or 10A
What is the pressure threshold at which lung damage is likely to occur during an arc blast?
1,728lbs/ft2 - 2,160lbs/ft2
A 15 ampere circuit breaker will not trip until an electrical overload of __________mA is felt in the human body.
15,001mA
If a person with average skin resistance contacts a 50V circuit, what is the resulting current flow according to the material?
Using Ohm's Law (I=v/r) 50v divided by 10,000Ω = 0.005A or 5mA