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NFPA 70E Important Definitions A+ Exam Questions With Detailed Solutions Graded A+
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ATPV - SOLVED ANSWER-Arc Thermal Performance Value-The incident energy (cal/cm^2) on a material or a multilayer system of materials that results in a 50 percent probability that sufficient heat transfer through the tested specimen is predicted to cause the onset of a second degree skin burn injury ...

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  • August 19, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • atpv solved answer arc thermal performance value

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NFPA 70E Important Definitions A+
Exam Questions With Detailed Solutions
Graded A+

ATPV - SOLVED ANSWER-Arc Thermal Performance Value-The incident energy
(cal/cm^2) on a material or a multilayer system of materials that results in a 50 percent
probability that sufficient heat transfer through the tested specimen is predicted to cause
the onset of a second degree skin burn injury based on the Stoll curve (Definition taken
from ASTM F1959/F1959M)



Cal/cm^2 - SOLVED ANSWER-Calories per square centimeter



Electrically Safe Work Condition - SOLVED ANSWER-When the power has been turned
off



Arc Flash Boundary - SOLVED ANSWER-When an arc flash hazard exists, an
approach limit from an arc source at which the incident energy equals 1.2 cal/cm^2
(One second exposure likely causes second degree burn)

Tables 130.7(C)(15)(a) & 130.7(C)(15)(b)



Limited Approach Boundary (120V) - SOLVED ANSWER-Table 130.4 (D)(a) [AC]. 3 ft 6
in



Restricted Approach Boundary (120V) - SOLVED ANSWER-Table 130.4 (D)(a) [AC]. 1
ft



Hierarchy of Risk Control - SOLVED ANSWER-1.Elimination 2.Substitution
3.Engineering controls 4.Awareness 5.Administration controls 6.PPE (See Table F.3 in
NFPA 70E)



Qualified Person - SOLVED ANSWER-One who has demonstrated skills and
knowledge related to the construction and operation of electrical equipment and

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