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11-11-2009, 07:43 PM
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#1
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Junior Member
Join Date: Nov 2009
Location: CA
Posts: 2
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aluminum conduit - 400 cycle system
I'm running 1'' - 2'' aluminum conduit for a 400 cycle system and the specs call for all aluminum fittings. It looks like I'm stuck with 3 piece couplings or (unions), as I have been unable to find threadless compression or set screw couplings in aluminum or zinc in that size range.
Anybody know a manufacturer?
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11-11-2009, 07:46 PM
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#2
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Senior Member
Join Date: Nov 2008
Location: Presque Isle, Maine
Posts: 2,232
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Sounds like a aviation test facility.
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"Whatever is felt is within suffering."
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11-11-2009, 08:14 PM
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#3
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Licensed Journeyman
Join Date: Oct 2007
Location: third world
Posts: 1,610
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“Dammit, Smithers, this isn’t rocket science, it’s brain surgery!”
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11-11-2009, 08:43 PM
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#4
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Junior Member
Join Date: Nov 2009
Location: CA
Posts: 2
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Navy training facility, T&B makes 1/2"-1" zinc set screw for rigid , Topaz has 1/2",3/4", and skips 1 1/4" - 2". Topaz also has 2 1/2" -4" in set screw.
A couple of days ago - discovered thin wall has the same OD as rigid in
2 1/2" - 4"
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11-11-2009, 11:24 PM
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#5
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Senior Member
Join Date: Apr 2009
Location: central east coast us
Posts: 788
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when you get stuck in an impossible situation and you can't find out what you need, find out where the base maintainance shop is and find out who the old tool is there and ask him what the last guys there used. those guys are the ones going around the base fixing all the crap that breaks, and when they aren't fixing it they are driving around laughing (or crying, or complaining) at some of the work that gets done, so they will most likely tell you how you should do it (whether you want to hear it or not).
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Chuck Norris sleeps with a night light. Not because Chuck Norris is afraid of the dark, but the dark is afraid of Chuck Norris.
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11-12-2009, 08:46 AM
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#6
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by gw92109
I'm running 1'' - 2'' aluminum conduit for a 400 cycle system and the specs call for all aluminum fittings. It looks like I'm stuck with 3 piece couplings or (unions), as I have been unable to find threadless compression or set screw couplings in aluminum or zinc in that size range.
Anybody know a manufacturer?
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If Zinc is acceptable, try http://www.bptfittings.com 
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Larry
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11-12-2009, 11:37 PM
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#7
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Senior Member
Join Date: Nov 2007
Location: Chicago
Posts: 460
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We're on the cusp of completing 5 MRI rooms where everything had to be non-ferrous. We've got nylon rod and nuts, fiberglass strut, and stainless beam clamps. I believe someone already posted the Hubbell link. Try typing aluminum fittings into Google and you'll be on your way. Unfortunately, I was unable to use threadless fittings (hospital spec) but the aluminum conduit is a joy to bend.
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11-13-2009, 12:11 AM
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#8
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by goose134
We're on the cusp of completing 5 MRI rooms where everything had to be non-ferrous. We've got nylon rod and nuts, fiberglass strut, and stainless beam clamps. I believe someone already posted the Hubbell link. Try typing aluminum fittings into Google and you'll be on your way. Unfortunately, I was unable to use threadless fittings (hospital spec) but the aluminum conduit is a joy to bend.
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How does the steel gland ring or set screw work out in each fitting? Is there any issue with that?
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Larry
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11-13-2009, 03:06 PM
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#9
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Senior Estimator
Join Date: Jun 2009
Location: Ventura County, Ca.
Posts: 73
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Quote:
Originally Posted by LJSMITH1
How does the steel gland ring or set screw work out in each fitting? Is there any issue with that?
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Yes - Any time you encircle a 400 hz cable with a ferrous (magnetic) material it causes significant voltage losses from induction. Are you familiar with induction?
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11-13-2009, 03:39 PM
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#10
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by chiefestimator
Yes - Any time you encircle a 400 hz cable with a ferrous (magnetic) material it causes significant voltage losses from induction. Are you familiar with induction?
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Yes I am. However, I am not aware of any 100% aluminum or zinc setscrew or compression fittings which meet the requirements of UL 514B (the governing specification of cable and conduit fittings).
Usually the set screw or gland ring are the steel components in these fittings. Of course you could use 100% PVC or fiberglass, but then the OP wanted all aluminum.
As an installer, you almost have no choice to thread all the aluminum conduit and use readily available aluminum or zinc threaded hubs & 3 pc. couplers.
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Larry
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11-13-2009, 06:30 PM
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#11
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Senior Estimator
Join Date: Jun 2009
Location: Ventura County, Ca.
Posts: 73
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Last edited by chiefestimator; 11-13-2009 at 06:31 PM.
Reason: spelling
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11-13-2009, 06:45 PM
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#12
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by chiefestimator
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 That's a THREADED aluminum Coupling fitting - The OP was looking for THREAD LESS Aluminum Fittings.
Like these...They are not made without steel components (as far as I know).
 COMPRESSION TYPE
 SET SCREW TYPE
Understand?
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Larry
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11-13-2009, 06:53 PM
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#13
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Senior Estimator
Join Date: Jun 2009
Location: Ventura County, Ca.
Posts: 73
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That's what I get for not going back to the original question.
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11-13-2009, 09:16 PM
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#14
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Doesn't Abuse Scotchkote
Join Date: Aug 2008
Location: Baltimore Md. & Holtwood Pa.
Posts: 205
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Look for Killark Electric GU/UN series. They are available in Aluminum.
We use a lot of these. I know there are other manufactures that have them but I can't think off the top of my head.
Charlie
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11-13-2009, 09:18 PM
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#15
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Senior Member
Join Date: Mar 2008
Location: Toronto, Canada
Posts: 664
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Quote:
Originally Posted by goose134
We're on the cusp of completing 5 MRI rooms where everything had to be non-ferrous. We've got nylon rod and nuts, fiberglass strut, and stainless beam clamps. I believe someone already posted the Hubbell link. Try typing aluminum fittings into Google and you'll be on your way. Unfortunately, I was unable to use threadless fittings (hospital spec) but the aluminum conduit is a joy to bend.
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Wow, that must be some interesting work to do!
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11-14-2009, 08:55 AM
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#16
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by Charlie K
Look for Killark Electric GU/UN series. They are available in Aluminum.
We use a lot of these. I know there are other manufactures that have them but I can't think off the top of my head.
Charlie
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They are threaded fittings. Doesn't anyone read the original post? 
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Larry
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11-14-2009, 01:20 PM
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#17
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Not Peter D
Join Date: Jan 2009
Location: USA
Posts: 5,323
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Quote:
Originally Posted by LJSMITH1
They are threaded fittings. Doesn't anyone read the original post? |
You should know by now that typical forum behavior is to provide an answer without ever reading the OP or other replies. 
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11-14-2009, 02:16 PM
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#18
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Lurker...
Join Date: May 2009
Location: Stratford, CT
Posts: 175
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Quote:
Originally Posted by Peter D
You should know by now that typical forum behavior is to provide an answer without ever reading the OP or other replies. |
I can *hope* for *change* can't I??
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Larry
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11-14-2009, 05:38 PM
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#19
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Doesn't Abuse Scotchkote
Join Date: Aug 2008
Location: Baltimore Md. & Holtwood Pa.
Posts: 205
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Sorry I misread your original post. Where I come from aluminum conduit is threaded. We thread our conduit when it is cut and do not use threadless fittings.
Charlie
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11-14-2009, 05:59 PM
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#20
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Senior Estimator
Join Date: Jun 2009
Location: Ventura County, Ca.
Posts: 73
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I just talked to my favorite GF who has done quite a few 400 hz systems for me. He has always had to use 3 piece couplings as the specs never allow set screw or compresion couplings. He has never heard of a non-ferrous set screw or compresion fittings.
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