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https://community.nfpa.org/thread/36796
Dec 07, 2018 · Panel interiors are not what I would call a free air environment. Running a cable in an interior space with no air flow is not what I would call a free air environment either. Conductors are capable of higher then rated ampacity by probably a factor of three if you were to calculate it out. NEC is very conservative when it comes to conductor ...Reviews: 8
https://iaeimagazine.org/magazine/features/support-of-exposed-cable-for-pv-systems-requirements-and-recommendations/
Ampacity of Conductors Bundled in a Cable Support. Another important concern of the AHJ is the ampacity of the conductors. Clearly, a USE-2 installation such as the one shown in figure 11 should be considered as a free air installation and subject to the free air ampacity table, Table 310.15(B)(17), for ampacity values.
https://www.electriciantalk.com/f31/definition-free-air-50089/
Feb 09, 2013 · Conductors in an enclosure don't qualify for free air. The idea of free air, is that heat can dissipate by air moving freely around the conductors. 4-004 (7) (b) You don't have to derate conuctors in an auxiliary gutter, but get no free air. I believe this also apply to splitters, and panels.
http://www.superiortray.com/tech-docs/cable-bus-engineered-systems/
The single conductor cables in a cable bus system are installed in a fully ventilated enclosure to keep the conductors within temperature limits. This engineered design allows for an excellent cooling of the conductors and a free air rating of the power conductors is achieved.
https://www.eng-tips.com/viewthread.cfm?qid=31735
Oct 04, 2002 · For NEC Table 310-17, what is the definition of "free air"? A major manufacturer of motor control equipment has sized conductors to motor starters inside enclosures (such as a Hoffman NEMA 4 enclosure) based upon Table 310-17, ampacities in free air.
http://wiresizecalculator.net/tables/maxampfa30.htm
The ampacity chart below shows the allowable ampacities of single-insulated electrical wire rated up to and including 2000 Volts in free air, based on Ambient Air Temperature of 30°C (86°F).. Wire Size Chart: Allowable Ampacities of Conductors in Free Air
https://diy.stackexchange.com/questions/30595/nec-definition-of-maintained-spacing-for-wire-in-free-air
NEC Definition of “Maintained Spacing” for Wire in Free Air. Ask Question Asked 6 years, 5 months ago. ... More Than Three Current-Carrying Conductors in a Raceway or Cable. ... I cannot find what "proper spacing" is for two wires run in parallel in free air. At the moment, I am most interested in the answer for NM-type wiring, but it would ...
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. ... 300.14 Length of Free Conductors at Outlets, Junctions, and Switch Points. ... Where clamping of insulation does not adequately support the cable, the conductor …
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