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https://www.ecmweb.com/national-electrical-code/qa/article/20888229/code-qa
Type MC cable can be unsupported where the cable is: 1) Fished through concealed spaces in finished buildings or structures, where support is impracticable, or 2) Not more than 6 ft long from the last point of cable support to the point of connection to luminaires or …
http://www.cooperindustries.com/content/dam/public/bline/Resources/Library/catalogs/fasteners_and_fixing/spring_steel_fasteners_NA/NECRequirements.pdf
Reprinted with permission from NFPA 70HB14, the National Electrical Code ... for cable support, must be secured at both ends. When independent wires are used in fire-rated assemblies, they must be distinguishable from those wires that are part of the fire-rated assembly.
https://www.ecmag.com/section/codes-standards/type-nm-cable-and-more
Prior to the 2005 NEC, an equipment-grounding conductor was permitted in Type NM cable, but a proposal accepted for the 2005 NEC now requires that Type NM cable must have, in addition to the insulated conductors, an insulated or bare conductor for equipment-grounding purposes only. See sections 404.9(B) and 334.108.
https://www.ecmag.com/section/codes-standards/installation-nonmetallic-sheathed-cable-exposed-or-raceway
Is it acceptable to install nonmetallic sheathed cable (NM) exposed on a wall or in an attic, a basement, or a residential garage? Where would physical protection of the NM cable be required, and where is physical protection of NM cable often used but not necessarily required?
https://www.thespruce.com/securing-electrical-cables-1152891
The National Electrical Code (NEC) outlines specifications for securing NM cable and other electrical wiring. Most local building authorities follow the NEC recommendations, but in any case, the local rules are the ones you must follow, and they are the specific requirements you must meet to pass inspections.
https://www.jadelearning.com/blog/securing-and-supporting-cables-and-raceways-2/
Jun 21, 2016 · A cable may remain loose while its support is maintained. Throughout Chapter 3 in the NEC, Wiring Methods and Materials, the .30 section is reserved for securing and supporting. For example, 330.30, 334.30, 352.30, 358.30 are all sections about securing and supporting. 330.30 Securing and Supporting Metal-Clad Cable: Type MC. Securing MC Cable.
https://www.ecmweb.com/national-electrical-code/code-basics/article/20896213/2011-nec-revisions-for-cable
The 2011 NEC clarifies that the use of NM cable in all dwelling unit garages and accessory storage buildings without the 15-minute finish rating is allowed, if the cables aren’t subject to physical damage [334.15(B)]. ... or panelboards or support structures (for example, concrete pads) can’t extend more than 6 in. beyond the front of the ...
https://iaeimagazine.org/magazine/features/vertical-mc-cable-support-in-the-2014-nec/
For vertical installations, any listed MC cable is allowed to be secured at 10 foot intervals (rather than the 6 foot interval required in the 2011 NEC) as long as the cable contains ungrounded conductors 250 kcmil or larger. Note that the language says that the MC cable must be listed, not “listed for the purpose.” UL 1569 is the product ...
https://www.cityofpensacola.com/DocumentCenter/View/100/Installation-Guidelines-for-Non-Metallic-Sheathed-Cable-Romex-PDF?bidId=
NEC sec. 370-17a 9. All cable jackets SHALL extend at least 1/4 inch into the box. NEC sec. 370-17c 10. All cable SHALL BE secured to the box, except for single gang non-metallic boxes, if stapled within 8 inches of the box. NEC sec. 370-17c 11. Unused openings in boxes SHALL BE effectively closed. NEC …
https://iaeimagazine.org/magazine/features/mc-cable-installations/
Photo 5. Vertical MC cable support. Bends in MC Cable. MC cable has no restrictions on the number of bends. The bending requirement for interlocked armor Type MC cable is “seven times the external diameter of the metallic sheath” as stated in Section 334-11(b) of the NEC.
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