Innerduct to RMC?

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Dr Duke

Dr Duke

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North Dakota USA
Wondering if anyone has any experience with "e-loc" couplings to go from innerduct to rmc? Or what would you normally use? I see some are made by Southwire and also Etco.

Thanks
 
Dr Duke said:
Wondering if anyone has any experience with "e-loc" couplings to go from innerduct to rmc? Or what would you normally use? I see some are made by Southwire and also Etco.

Thanks
Click to expand...

I have never seen inner duct directly fastened to any metal conduit.

The typical installation is to just run inner duct inside the conduit .... you know ... inside therefore 'inner duct'.


HPIM1229.jpg
 
We just quoted a large project that spec'ed HDPE. During my research on using HDPE and fittings, I contacted Etco direct, their E-Loc couplings are not listed. As far as I can tell Southwire is using Etco couplings as well, but I was never able to get a call back when I contacted Southwire to verify the listing issue.

It's interesting to note, I was never able to find a listed 3/4" HDPE coupling, even though 3/4" UL listed HDPE is available. The Duraline Shur Lock fittings start from 1" and go up and are listed.

I'm surprised the HDPE industry hasn't corrected this issue with 3/4" fittings, this size must be very low demand. Those E Locs look like they'd work well, if you weren't working under the NEC and the required listing issues.
 
I have never seen inner duct directly fastened to any metal conduit.

The typical installation is to just run inner duct inside the conduit .... you know ... inside therefore 'inner duct'.
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Exactly. Why do you think they call it "innerduct"? Maybe you are confusing it with Smurftube that looks similar.

-Hal
 
Ok, so I understand the corrugated innerduct application. Running through sleeves. How about the HDPE innerduct that gets bored in? And these couplings in the link above a specifically for changing over. I have seen aluminum pound on ones before. How do you normally change over a 400' bore of HDPE to RMC or PVC? That is what I was asking.
 
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Dr Duke said:
Ok, so I understand the corrugated innerduct application. Running through sleeves. How about the HDPE innerduct that gets bored in? And these couplings in the link above a specifically for changing over. I have seen aluminum pound on ones before. How do you normally change over a 400' bore of HDPE to RMC or PVC? That is what I was asking.
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You're talking about the underground stuff installed after a line bore then. That's an article 353 install. RPVC is your normal rigid grey plastic conduit. Anyway, a few couplings for them are on the thread I linked earlier. The first link is now dead; here's a new one, which is what you linked:


http://www.carlonsales.com/pdfs/HDPE/2F51-Accessories.pdf

Works great joining HDPE (what you are calling innerduct) to IMC or RGS(RMC) steel conduits.

eta: btw, if the ends of the innerduct are ovaled a bit, a large C-clamp applied ~6" from the end will make it round again and give you room to apply the coupler while the clamp is still on the pipe.
 
Yes, exactly what I'm talking about. So I wonder if those Carlon(T&B) e-locs are listed? Or if those aluminum ones have threads on one side and a barbed fitting for the other half. I remember using a blue anodized one a long time ago and I do recall pounding it on the innerduct/HDPE/smoothwall, cause it was barbed on the one side but I don't remember if it was threads on the other or what. Or if those are listed either. But yea, that's what I'm talking about. Maybe I'll call Carlon tomorrow.

Sorry if I'm not calling it it's technical term.
 
I emailed T&B(Carlon) today and they email me back saying that when they sold them in the US they weren't listed. They went on to tell me that they are no longer for sale in the US. Found some nice aluminum ones at cabletecusa.com and they told me that they were listed 6 years ago but they have since dropped the listing. But the cabletec ones are the ones I was thinking of.

https://www.cabletecusa.com/shop/hdpe-pvc-transition-aluminum-coupler/
 
Well generally 2" through 4". We just had two 2-1/2" and one 2" bored in with no proper way to connect them. The supply houses had no answer either. It would also come in handy for other sizes as well like 3/4". It surprises me that it isn't more common. I could very well be missing something.
 
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