[RE-wrenches] Cable tray

[William Miller]

David:

Of course, I understand that you are not saying we can willfully disregard 
the Code in anticipation of future clarification.  I was just extrapolating 
on your idea.

If we want an exception based on a predicted update in the code, we are at 
the mercy of the AHJ who may or may not be convinced.  I think most AHJs 
are willing to diverge from the Code in a more strict interpretation, but 
not the reverse. Right now, as I read it, unless the leads are 1/0 or 
larger, we are forbade.

I treat PV systems like rooftop AC units.  The voltages and currents are 
similar, if not more severe.  I don't believe you could or should run power 
to a rooftop AC unit in cable tray.  Conduit is a tried and true practice 
and I recommend it.

William Miller


At 06:01 PM 3/25/2013, you wrote:
>Ouch. I promise I'm not advocating for anything like that. What I may be 
>missing is the Code reference that says "no cable tray on roofs" or similar.
>
>There is so much room for improvement in wire management practices, that 
>being able to use cable tray seems like a step forward. I understand some 
>jurisdictions do not allow it, but it appears as though Code changes were 
>made specifically to address this. It's boring stuff, but you can read the 
>explanation of the Code changes in the ROP and ROC documents.
>
>The Code changes a lot with regards to PV system, and Article 690 is more 
>fluid than other articles. Some of this is the Code trying to keep up with 
>technology. In other cases the Code evolves based on new applications for 
>existing products. Often it changes because some areas of the Code are 
>confusing for electricians and inspectors alike. If the new Code language 
>is more clear in its intent than previous versions, some inspectors are 
>willing to let installers build to the most current standard.
>
>That's all I'm advocating for: Trying to understand how the minimum 
>requirements outlined in Code evolve over time so that you can have a 
>friendly and informed conversation with your AHJ over a donut.
>
>
>
>
>On Mar 25, 2013, at 6:26 PM, William Miller wrote:
>
>>David:
>>
>>This is great news.  Now, whenever I want to do something that is 
>>prohibited by code, I can just say that the Code Making Panel is gonna 
>>correct that pesky code section (insert your problem citation here) any 
>>day now, so I might as well be allowed to do whatever it was I was fixin' 
>>to do anyway.  Unless I am missing something...
>>
>>Thanks!
>>
>>William Miller
>>
>>PS:  Just kidding.  Hope no offense is taken.
>>
>>wm
>>
>>
>>At 03:46 PM 3/25/2013, you wrote:
>>
>>>So if you ever get called on 392.10(B)(2), I think you can point out 
>>>that the Code Making Panels have been busy clarifying that cable tray is 
>>>okay for source circuit conductors. Unless I'm missing something....
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Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985
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