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Thursday, August 28, 2014

Question:

Chuck (if I may), Thanks for your dedication and patience.

In the 2011 NEC Chapter 9, Table 10; where is the categorization explanation for class B and class C copper stranding?

Exceeding Expectations, David Engelhart

A

Answer:

Hey David thanks for your question and compliment. I actually prefer Charlie, it has a nicer ring to it.

If I understand what you are asking then it is determined by counting the number of strands. Let's say we have a 500 kcmil conductor which would be in the range of 250-500 in the first column of Table 10. If the number of strands exceeds 37 [Class B] or 61[Class C] then it would be considered a "fine stranded conductor".

See NEC Chapter 9, Table 10.

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CHARLIE TROUT: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

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