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https://www.ecmweb.com/content/article/20889062/does-the-nec-limit-a-flexible-metal-conduit-run
The NEC permits longer runs of flexible metal conduit (FMC) with certain limitations. Per Sec. 250-9(b) (Grounding), a recognized equipment grounding conductor can be flexible metal conduit where the conduit and fittings are listed for grounding. Both exceptions allowing FMC limit the length to 6 ft.
https://www.ecmweb.com/national-electrical-code/qa/article/20897189/code-qa-flexible-metal-conduit
What uses does the NEC permit and forbid for flexible metal conduit? A. According to 348.10 of the 2011 NEC, flexible metal conduit (FMC) is permitted in exposed or concealed locations. On the other hand, the locations where FMC is not permitted are much more specific. As noted in 348.12, FMC shall not be used: In wet locations.
https://www.nema.org/Products/Pages/Flexible-Metal-Conduit.aspx
FMC protects electrical wiring in commercial and industrial buildings. Liquidtight flexible metal conduit (LFMC) is a special type of FMC that has a plastic coating. When used with sealed fittings, it …
https://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=102.0
The general rule for securing and supporting FMC is to fasten it within 12 inches of the box and secure it no further than every 4.5 feet. If the FMC is installed above an accessible ceiling, exception 4 allows the support spacing to be increased to 6 feet “ from the last point where the raceway is securely fastened ”.
http://www.cooperindustries.com/content/dam/public/bline/Resources/Library/catalogs/fasteners_and_fixing/spring_steel_fasteners_NA/NEC.pdf
in place. Support wires that do not provide secure support shall not be permitted as the sole support. Support wires and associated fittings that provide secure support and that are installed in addition to the ceiling grid support wires shall be permitted as the sole support. Where independent support …
https://www.necam.com/Support/PartnersDealer/doc.cfm?t=TechnicalAssistance
NEC designed the National Technical Assistance Center(NTAC) to provide end-to-end technical support services and resources to its network of authorized channel partners.
https://forums.mikeholt.com/forum/active-forums/nec/89741-sealtite-need-for-additional-support-for-short-lengths/page2
Back in 2009 a member with the user name of "Masher" asked an interesting question as to whether a short length of Sealtite (say 11") could be installed with the only support being the two fittings at each end. With the changes in the wording for the 2011 NEC, I'd like to reopen that question.
http://www.primeconduit.com/TechDocs/Sch40Sch80/Sch4080_FAQ.pdf
Per NEC 352.12(D) PVC conduit has a maximum ambient temperature of 50 °C or 122 ° F. Low Temperature Limit . Schedule 40 does not have a lower temperature limitation since it is not allowed to be used in areas where subject to physical damage. (NEC 352.10(F)). When Schedule 40 PVC is exposed to very low temperatures it will become more brittle.
https://allstarce.com/wp-content/uploads/2016/12/2017-NEC-Code-Ch-3-Article-300-2.pdf
NEC 2017 Code Changes Chapter 3 - Wiring Methods and Materials Changes from the 2014 code are highlighted in yellow. ARTICLE 300 - General Requirements for Wiring Methods and ... conduit or tubing that is used to provide cable support or protection against physical damage. A fitting shall be provided on the end(s) of the conduit or tubing to ...
https://diy.stackexchange.com/questions/11617/do-i-really-have-to-fasten-interior-wall-electrical-wire-to-a-stud-to-keep-it-fr
334.30 Securing and Supporting Nonmetallic-sheathed cable shall be supported and secured by staples, cable ties, straps, hangers, or similar fittings designed and installed so as not to damage the cable, at intervals not exceeding 1.4 m (4 1⁄2 ft) and within 300 mm (12 in.) of every outlet box. junction box, cabinet, or fitting.
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