NEC 2017 Code Changes Chapter 3 - Wiring Methods and …
(2) Nonmetallic-Sheathed Cable and Electrical Nonmetallic Tubing. Where nails or screws are likely to penetrate nonmetallic-sheathed cable or electrical nonmetallic tubing, a steel sleeve, steel plate, or steel clip not less than 1.6 mm (1∕16 in.) in thickness shall be used to protect the cable or tubing.
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NEC 2017 Code Changes Chapter 3 - Wiring Methods and Materials
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