Question 9020 of 749 · Maryland Journeyperson Electrician Exam
Intrinsically safe systems covered by Article 504 rely on which protection principle?
Exactly one answer is correct.
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Correct answer to question 9020
- C: Electrical and thermal energy is limited so it cannot ignite the hazardous atmosphere
Explanation
Intrinsic safety limits the energy available under normal and fault conditions below the level needed to ignite the specific hazardous atmosphere. Containment of an explosion is the explosionproof method, and oil immersion is a separate protection technique.
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