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