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Practice Test Question: MC Cable Bend Radius

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    Practice Test Question: MC Cable Bend Radius

    The practice question reads:

    "Type MC Cable has a bending radius of ____ times the external diameter of the metallic sheathing."

    I put 7 times the external diameter and got it wrong.

    The question suggests go to NFPA 70 Article 330.24(B), but I could only find NEC Article 330.24(B) that says 7 times the external diameter of the metallic sheathing for interlocked type armor or corrugated sheath. This question doesn't say it is smooth sheathed wire, but that bend radius varies with the external diameter of the wire, which wasn't given. Why is 7 times wrong and what is the right answer?

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    Quote Originally Posted by EricGoetz92 View Post
    The practice question reads:

    "Type MC Cable has a bending radius of ____ times the external diameter of the metallic sheathing."

    I put 7 times the external diameter and got it wrong.

    The question suggests go to NFPA 70 Article 330.24(B), but I could only find NEC Article 330.24(B) that says 7 times the external diameter of the metallic sheathing for interlocked type armor or corrugated sheath. This question doesn't say it is smooth sheathed wire, but that bend radius varies with the external diameter of the wire, which wasn't given. Why is 7 times wrong and what is the right answer?
    7 is the correct answer, I've posted a handy reference for cable bending radius below. This question needs to be updated!

    Click image for larger version. 

Name:	cable-multiplier-bending-radius.png 
Views:	190 
Size:	32.8 KB 
ID:	254

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    Quote Originally Posted by SecondGen View Post
    7 is the correct answer, I've posted a handy reference for cable bending radius below. This question needs to be updated!

    Click image for larger version. 

Name:	cable-multiplier-bending-radius.png 
Views:	190 
Size:	32.8 KB 
ID:	254
    Thank you very much, I am definitely saving that chart.

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