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Apprentice Electrician Exam Prep Set 3: Conduit, Boxes, and Safety

Use this set as a timed drill: answer first, then check the key and explanation.

Questions

1. What NEC article is commonly used for EMT installation rules?
2. What is one primary reason to ream conduit after cutting?
3. Can flexible cords be used as a substitute for fixed wiring of a structure?
4. What does “listed” mean for electrical equipment?
5. How is conduit fill generally determined?
6. When are locknuts/bushings typically required with metal raceways entering boxes?
7. What is the purpose of bonding metal enclosures?
8. Are extension cords permitted for permanent use through walls or ceilings?
9. What should be done before pulling conductors into long conduit runs with bends?
10. Why must working space around electrical equipment remain clear?

Answer Key + Explanations

1) Article 358.

Article 358 covers electrical metallic tubing uses, fittings, support, and installation requirements.

2) To remove burrs that could damage conductor insulation.

Sharp edges can nick insulation, increasing fault risk and code violations.

3) No.

NEC 400 prohibits flexible cords as a substitute for permanent wiring methods.

4) It has been evaluated by a qualified testing organization and found suitable for specified use.

NEC Article 100 definitions and product standards underpin listing/labeling requirements.

5) By conduit type/size and total conductor area using Chapter 9 tables.

NEC Chapter 9 plus annex tables guide maximum fill percentages and dimensions.

6) When needed to secure bonding/protection and meet fitting listing requirements.

Proper fittings ensure continuity and protect conductors at raceway entries.

7) To keep conductive parts at the same potential and ensure fault clearing.

Bonding reduces shock hazards and supports rapid overcurrent device operation.

8) No.

NEC 400 disallows routing flexible cords through structural openings for permanent wiring.

9) Plan pull points, verify bend limits, and use approved pulling/lubrication methods.

Pre-planning avoids insulation damage and excessive pulling tension.

10) For safe operation and maintenance access.

NEC 110.26 requires sufficient access/working clearances to reduce injury risk and enable servicing.

References

• NFPA 70, National Electrical Code (NEC), current adopted edition in your jurisdiction.
• NFPA 70E, Standard for Electrical Safety in the Workplace.
• OSHA 29 CFR 1910 Subpart S and 1926 Subpart K (as applicable).
• Local AHJ amendments and utility service requirements.

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Related internal guide

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