NFPA 70E (2024 Latest Update)Accurate 100%

ATPV - 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 - ANSWER Calories per square centimeter Electrically Safe Work Condition - ANSWER When the power has been turned off Arc Flash Boundary - 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) - ANSWER Table 130.4 (D)(a) [AC]. 3 ft 6 in Restricted Approach Boundary (120V) - ANSWER Table 130.4 (D)(a) [AC]. 1 ft Hierarchy of Risk Control - ANSWER 1.Elimination 2.Substitution 3.Engineering controls 4.Awareness 5.Administration controls 6.PPE (See Table F.3 in NFPA 70E) Qualified Person - ANSWER One who has demonstrated skills and knowledge related to the construction and operation of electrical equipment and installations and has received safety training to