8.a. Four electricians are discussing transformer installations. Electrician A says that there's no size requirement for the door sill of a transformer vault as long as the sill contains the oil from the largest transformer. Electrician B says that the AHJ can require a fire rating of three hours for vault doors on an exterior wall. Electrician C says that the minimum height requirement for the sill is 3″. Electrician D says that a three-hour fire-rated door is even required for a vault with an automatic sprinkler system. Which of the following statements is correct? A. Electrician A is correct. B. Electrician C is correct. C. Electrician B is correct. D. Electrician D is correct. 8.b. Four electricians are discussing hazardous locations. Electrician A says that hazardous-location classifications are determined by the presence of gases, dust, or ignitable fibers. Electrician B says that Division 2 conditions would create a fire or explosion under normal circumstances. Electrician C says that hazardous-location classifications are determined by the presence of gases, dust, available water, or ignitable fibers. Electrician D says that the presence of hazardous substances doesn't limit a selection of wiring. Which of the following statements is correct? A. Electrician D is correct. B. Electrician C is correct. C. Electrician B is correct. D. Electrician A is correct.
8.a. Four electricians are discussing transformer installations. Electrician A says that there's no size
requirement for the door sill of a transformer vault as long as the sill contains the oil from the largest
transformer. Electrician B says that the AHJ can require a fire rating of three hours for vault doors on an
exterior wall. Electrician C says that the minimum height requirement for the sill is 3″. Electrician D says
that a three-hour fire-rated door is even required for a vault with an automatic sprinkler system. Which of
the following statements is correct?
A. Electrician A is correct.
B. Electrician C is correct.
C. Electrician B is correct.
D. Electrician D is correct.
8.b. Four electricians are discussing hazardous locations. Electrician A says that hazardous-location
classifications are determined by the presence of gases, dust, or ignitable fibers. Electrician B says that
Division 2 conditions would create a fire or explosion under normal circumstances. Electrician C says that
hazardous-location classifications are determined by the presence of gases, dust, available water, or
ignitable fibers. Electrician D says that the presence of hazardous substances doesn't limit a selection of
wiring. Which of the following statements is correct?
A. Electrician D is correct.
B. Electrician C is correct.
C. Electrician B is correct.
D. Electrician A is correct.
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