nec code 300.8
This is an interesting question.
Sherman, fire up the wayback machine
If you were to roll back to previous editions of the NEC (prior to the 2014 edition), and should you be specifically installing conductors that fall under the rules of article 725 (Class 1, Class 2, and Class 3 remote control, signaling, and power limited circuits) you might be surprised to find that in Article 725.3 this specific rule is stated
Only those sections of Article 300 referenced in this article shall apply to class 1, class 2, and class 3 circuits
And Article 300.8 is not referenced below article 725.3
This is why in many older industrial facilities you could easily find control circuit cables sharing tray space with instrument air lines for example.
In the 2014 edition of NFPA 70, paragraph (K) was added to Article 725.3 prohibiting this type of installation and requiring that class1, class2, and class3 circuits comply with article 300.8
I’m not claiming to be an expert, but my quick look through editions of the NEC I keep on my desk, 2005, 2008, 2011, and 2014 revealed to me no specific mention of barriers in trays that would allow an exemption to the requirements of Article 300.8 (as prior to 2014 mixing systems was permitted under article 725).
Of course, you could be talking about something other than class 1, class 2, and class 3 circuits, but in the long run I believe it is unlikely that the Authority Having Jurisdiction will permit mixing wiring methods with other systems in cable tray installations under the current edition of the NEC.
But if you had a barrier it would be like running 2 wireways sidexside correct?
On this I can only give you my opinion, but if the barrier was listed by the manufacturer for the purpose of isolating a section of the tray, effectively creating two separate trays, then I would think that the AHJ would allow it, but ultimately it is going to be up to the AHJ to decide if the barrier creates a separation in the tray that meets the intent of Article 300.8
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