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If a new building is being constructed using metal framing members, what wiring method must be...

If a new building is being constructed using metal framing members, what wiring method must be provided prior to installation of Non-Metallic-Sheathed Cable through the framing members?

Engineering   Electrical-Engineering   
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Answer #1

The NEC code chapter-3 Article 300.4 Protection Against Physical Damage it is stated that :

(B) Nonmetallic-sheated Cables and Electrical Nonmetallic Tubing Through Metal Framing Members.

(1) Nonmetallic-Sheated Cable. In both exposed and concealed locations where nonmetallic-sheated cables pass through either factory- or field-punched, cut, or drilled slots or holes in metal members, the cable shall be protected by listed bushings or listed grommets covering all metal edges that are securely fastened in the opening prior to installation of the cable.

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