National Electrical Code Articles and Information

Code Quiz: Article 348

Based on the 2014 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Codebookcity.com. Since 1996, he has been writing National Electrical Code articles for electrical trade magazines and has an extensive portfolio of hundreds of NEC articles..

The Chapter Three Articles on wiring methods run in multiple series. But after Article 344 there is no Article 346. Why the jump to Article 348? Notice the sequence. Articles 342 and 344 are about metal conduit that comes in a stick. RMC and IMC are manufactured the same way; it's rolled and welded into a pipe shape.

Perhaps some day there will be a conduit called TMC (Thin Metal Conduit) that is made of a very strong and inexpensive steel. We don't have that, right now. To get the type of conduit described by Article 348, the method of manufacture is to wind metal strips. 

1. Article 348 is the fourteenth in a series of Chapter 3 articles addressing specific wiring methods. Which one does it address, and what are its defining characteristics?
    

2. Name three permitted uses for this wiring method.
    

3. Name the prohibited uses for this wiring method.
    

4. What type hardware is permitted for supporting this wiring method?
    

5. What restriction is there on using couplings and connectors with this conduit?

Answers to this quiz are here: Answers to this quiz

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