Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Hazardous (Classified) Locations Flashcards

7 cards from real E2 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which NEC article governs Class III hazardous locations involving ignitable fibers or flyings?

    Answer: Article 503

    NEC Article 503 covers Class III locations where easily ignitable fibers or flyings are handled, manufactured, or used.

  2. What does the temperature class (T-code) on explosion-proof equipment indicate?

    Answer: The maximum surface temperature the equipment can reach

    The T-code (T1 through T6) indicates the maximum surface temperature the equipment can reach during operation, which must not exceed the ignition temperature of the hazardous gas or vapor present.

  3. In a Class I, Division 2 location, standard open-type motors are permitted under which condition?

    Answer: When the motor does not have sliding contacts or switching mechanisms inside the motor enclosure

    In Class I, Division 2, squirrel-cage induction motors without brushes, switching mechanisms, or similar arc-producing devices inside the enclosure may be used.

  4. The zone classification system for Class I locations (Zone 0, 1, 2) was derived from which standard?

    Answer: IEC (International Electrotechnical Commission) standards

    The Zone classification system was derived from IEC (International Electrotechnical Commission) standards and was incorporated into the NEC as an alternative to the Division system.

  5. What is the minimum sealing compound fill requirement for conduit seals in Class I locations?

    Answer: Three-eighths of the internal diameter of the conduit but not less than 5/8 inch

    Per NEC Section 501.15, the sealing compound must have a minimum thickness equal to the trade size of the conduit but not less than 5/8 inch.

  6. In a hazardous location, which of the following does NOT require an explosion-proof enclosure in a Class I, Division 1 location?

    Answer: Current transformers with no make-or-break contacts

    Current transformers with no make-or-break contacts and no moving parts do not require explosion-proof enclosures since they cannot produce ignition-capable arcs.

  7. A textile mill processing cotton fibers would be classified as which type of hazardous location?

    Answer: Class III, Division 1

    Textile mills processing cotton and other natural fibers are Class III, Division 1 locations where ignitable fibers are handled during manufacturing.