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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.ecmag.com/section/codes-standards/article-370-boxes-conduit-bodies-and-fittings-2
Essentially, rigid metal or intermediate metal conduit can support an enclosure that is supporting a fixture where the conduit is secured within 18 inches of the enclosure. However, if the conditions of this second exception are met, the support distance can be lengthened to 36 inches.
https://www.jadelearning.com/blog/securing-and-supporting-cables-and-raceways-2/
Jun 21, 2016 · In dwelling units within an accessible ceiling, support for the cable can be 4 ½ ft. from the last point of support to a connection to a luminaire or other piece of electrical equipment. 352.30 Securing and Supporting Rigid Polyvinyl Chloride Conduit: Type PVC. Expansion fittings for PVC conduit.
https://www.electrical-knowhow.com/2013/06/conduit-fittings-and-supports.html
Rigid metallic conduit and electrical metallic tubing both require support. Conduit should be fastened by straps to the ceiling or wall, or supported on hangers from the ceiling at least every 10 feet (Figure 11). Conduit should be fastened within 3 feet of a box (5 feet of unbroken lengths are allowed if structural members do not permit ...
https://steeltubeinstitute.org/steel-conduit/wp-content/uploads/sites/4/2013/04/ConGuide.pdf
3.1.1 Steel rigid metal conduit - RMC (ferrous metal) (NOTE: While the scope of the National Electrical Code Article for Rigid Metal Conduit – Type RMC includes conduits manufactured from aluminum, stainless steel, red brass, or other metals they are not covered by this standard.) Steel Rigid Metal Conduit (RMC) is a listed
http://constructionmanuals.tpub.com/14027/css/Conduit-Supports-and-Installation-Methods-118.htm
CONDUIT SUPPORTS AND INSTALLATION METHODS . ... enables you to order screws of the proper diameters to support the straps. LOCATION OF CONDUIT SUPPORTS . The Code states that rigid-metal conduit will be firmly secured within 3 feet of each outlet box, junction box, cabinet, or fitting. The Code permits this distance to be increased to 5 feet ...
https://www.ecmag.com/section/codes-standards/article-370-boxes-conduit-bodies-and-fittings
Besides rigid metal and intermediate metal conduit, rigid nonmetallic conduit and EMT are permitted as means of support. Using rigid nonmetallic conduit or EMT as support is only permitted if the raceway’s trade size matches, or exceeds, the conduit body’s trade size.
https://forums.mikeholt.com/forum/active-forums/nec/9981-rigid-steel-conduit-as-light-pole
Re: Rigid Steel Conduit as Light Pole A piece of any kind of conduit may be used to support other raceways, sprinkler systems, duct work, etc. just the same as a piece of 2 X 4 would be used. A piece of any electrical equipment may be used for whatever purpose you see fit and as long as it is not being used for its original purpose, it may be OK.
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