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Old 04-05-2017, 09:37 PM   #1
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Default Flexible non metallic conduit

Im in a jam and was hoping someone could help? I want to get this job done in a day (tomorrow of course )

I have to feed 2 condensers on the roof of a shopping mall. I will be running the feeders through a ventilation shaft that is used for supply air to the main electrical vault. I was planning to run teck from the disconnects on the units, down the shaft (with jacket removed) and into the vault, junction box, and bx the rest of the way to the panel.

Instead, could I run "tough tube" down the shaft? We have a ton at the shop and I want to use it but Im getting mixed answers from everyone. Help! I know answers may vary depending on jurisdictions etc.

Canadian Electrical Code, BC
https://ontario.westburne.ca/medias/...263_144_en.pdf

I cant find anything telling me I cant! LOL
Thank you very much
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Old 04-05-2017, 09:46 PM   #2
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I don't think I would run anything in there wasn't plenum rated. Does that matter in Canada?
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Old 04-05-2017, 09:51 PM   #3
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No. Liqudtite is not suitable for this use.
code ref 12-1302.
P&L
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Old 04-05-2017, 10:06 PM   #4
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Thanks P&L

Is that based on sub rule 1?
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Old 04-05-2017, 10:14 PM   #5
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Originally Posted by DoubleAction View Post
Thanks P&L

Is that based on sub rule 1?
sub 1,2&3 are all suggesting that the intended/allowed use is as
a flexible connection to a load. For instance, from a disconnect to
an A/C unit. Not as a general use conduit.
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BTW, the CEC section is the best place for Canadian rules.
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Old 04-05-2017, 10:47 PM   #6
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Quote:
Originally Posted by DoubleAction View Post
Im in a jam and was hoping someone could help? I want to get this job done in a day (tomorrow of course )

I have to feed 2 condensers on the roof of a shopping mall. I will be running the feeders through a ventilation shaft that is used for supply air to the main electrical vault. I was planning to run teck from the disconnects on the units, down the shaft (with jacket removed) and into the vault, junction box, and bx the rest of the way to the panel.

Instead, could I run "tough tube" down the shaft? We have a ton at the shop and I want to use it but Im getting mixed answers from everyone. Help! I know answers may vary depending on jurisdictions etc.

Canadian Electrical Code, BC
https://ontario.westburne.ca/medias/...263_144_en.pdf

I cant find anything telling me I cant! LOL
Thank you very much
Why take the rubber jacket off the cable? Is there no other way to install this than the plenum?

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No. Liqudtite is not suitable for this use.
code ref 12-1302.
P&L
I'm assuming you're referring to the "tough tube" (liquid tight) option?

I didn't see where you couldn't run teck, since it is FT4 rated, but I'm not sure how it could be firestopped at each end properly... I'd be looking at an alternate route..
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Old 04-05-2017, 11:59 PM   #7
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Quote:
Originally Posted by DoubleAction View Post
Im in a jam and was hoping someone could help? I want to get this job done in a day (tomorrow of course )

I have to feed 2 condensers on the roof of a shopping mall. I will be running the feeders through a ventilation shaft that is used for supply air to the main electrical vault. I was planning to run teck from the disconnects on the units, down the shaft (with jacket removed) and into the vault, junction box, and bx the rest of the way to the panel.

Instead, could I run "tough tube" down the shaft? We have a ton at the shop and I want to use it but Im getting mixed answers from everyone. Help! I know answers may vary depending on jurisdictions etc.

Canadian Electrical Code, BC
https://ontario.westburne.ca/medias/...263_144_en.pdf

I cant find anything telling me I cant! LOL
Thank you very much


So by "tough tube" I am assuming this is the trade slang up there for "flexible non metallic tubing / conduit" eh?

We call that "smurf tube" down here. I'm not familiar with Canadian Code but I'm pretty sure the NEC doesn't allow FNMC in ventilation shafts.

I'd be trying to find a better way to do the job. Is EMT out of the question? At least for the portion where it is in the ventilation shaft?


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Old 04-06-2017, 11:46 PM   #8
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Jobs done! I'm asking for an apprentice next time, I'm beat. Yes the plenum was the only option. I used teck. I'm trying to stick to the job as quoted, which my boss says I should do more often
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Old 04-07-2017, 08:04 AM   #9
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Quote:
Originally Posted by DoubleAction View Post
Jobs done! I'm asking for an apprentice next time, I'm beat. Yes the plenum was the only option. I used teck. I'm trying to stick to the job as quoted, which my boss says I should do more often
But why strip off the outer jacket? How did you seal the duct openings where the cable came out?
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