18. According to the NEC, which of the following protection techniques is permitted for Class I, Division 1 or 2 locations? A. Hermetically sealed equipment B. Nonincendive equipment C. Explosion-proof equipment D. Dust-tight equipment
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The NEC (National Electrical Code) provides guidelines for electrical installations in hazardous locations, specifically Class I, Division 1 or 2 locations, which are areas where flammable gases or vapors may be present. Show more…
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15. 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 does not limit the selection of wiring. Which of the following statements is correct? A. Electrician B is correct B. Electrician D is correct C. Electrician C is correct D. Electrician A is correct
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Class II, Division 1 locations are considered hazardous because they contain dusts such as wood, grain, and dried egg and milk powders, which are A. combustible and nonconductive B. noncombustible and nonconductive C. ignitable and conductive D. noncombustible and conductive.
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