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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 ... Support wires that do not provide secure ... protection in the form of rigid metal conduit, intermediate metal conduit, or rigid nonmetallic conduit having a length not exceeding 3.05 m.
http://wiresizecalculator.net/tables/conduitsupportstable.htm
These tables list the maximum distance between conduit supports for rigid metallic and non-metallic conduit. Supports for Rigid Metallic Conduit Source: NFPA 70, National Electrical Code…
https://www.ecmweb.com/cee-news-magazine-archive/article/20894958/code-guide
They do not say, “directly attached to the structure.” Generally, the maximum support spacing requirement for RMC (rigid metallic conduit) of trade size 1 is 10 ft, but for straight runs with threaded couplings, this spacing is increased to 12 ft. Nothing in the NEC states that you cannot use the same supports for conduit as for other systems.
https://www.electriciantalk.com/f2/conduit-spacing-chart-36/
Feb 21, 2009 · When you're laying out multiple knockouts in a panel, it's helpful to know the spacing of one conduit to another, center to center. To use the chart, do as follows. If you have, for instance, a 1" conduit next to a 1/2 inch conduit look up 1/2" on the top of the chart and 1" on the left hand side.
https://steeltubeinstitute.org/steel-conduit/wp-content/uploads/sites/4/2013/04/ConGuide.pdf
the NEC and/or state and local codes as applicable to the jurisdiction, and the manufacturers’ instructions when installing electrical products and systems. Installations must be performed “in a neat and workmanlike manner.” This is one of the most basic and important requirements for electrical wiring in the National Electrical Code.
https://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=102.0
In the 2014 NEC, that question has been answered by a code change to exception 4. According to the new code language, for the purposes of this exception, listed flexible metal conduit fittings shall be permitted as a means of support.
http://www.cooperindustries.com/content/dam/public/bline/Resources/Library/catalogs/bolted_framing/strut_systems/rd-rigidsteelconduitimc.pdf
supported in accordance with NEC Article 345 and 346, provided such supports prevent transmission of stresses to termination where conduit is deflected between supports. Dimensions taken from ANSI C80.1-1977. *Conduit plus weight of heaviest conductor combination as specified by the National Electrical Code. Conduit Size Maximum Support Span
https://steeltubeinstitute.org/steel-conduit/resources/installation-guides/support-raceways/
Supporting Follow all Code requirements for spacing of supports and frequency of securing RMC, IMC and EMT. The requirement to securely fasten raceways within the specified distance from each “termination point” includes, but is not limited to, outlet and junction boxes, device boxes, cabinets, and conduit bodies. Each raceway shall be so secured.
https://platt.com/CutSheets/Generic/222-225.pdf
Rigid Nonmetallic Conduit – Schedule 40 and Schedule 80 ... NEC shows the support requirements for Schedule ... Maximum ambient temperature is 122°F (50°C). Table 352.30(B),NEC Trade Maximum Spacing Between Size Supports (feet) 1/2-1 3 11/4-2 5 21/2-3 6 31/2-5 7 6 8 Acceptable Dimensions in Inches of Integral Bell per UL 651
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