Practice Test Question: MC Cable Bend Radius

[EricGoetz92]

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?

[SecondGen]

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!

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[EricGoetz92]

7 is the correct answer, I've posted a handy reference for cable bending radius below. This question needs to be updated!

254

Thank you very much, I am definitely saving that chart.