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Topic Title: PVC threaded couplers?
Topic Summary: any alternative
Created On: 11 April 2013 12:39 PM
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 11 April 2013 12:39 PM
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AJJewsbury

Posts: 11768
Joined: 13 August 2003

I'm wanting to couple some insulated enclosures to PVC trunking (50x50) (the shape of the box means it doesn't quite fit neatly just butted up to the side of the trunking). If it were an all steel installation I'd just use a threaded coupler and a couple of brass bushes to link the box to the trunking, but in the PVC world there seems to be only male & female adaptors - both plain on the conduit end.

Spacewise, I'd rather not have to have two adaptors with a sort length of conduit between.

Does anyone know of some PVC threaded couplers? or a better alternative?

thanks

- Andy.
 11 April 2013 12:52 PM
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tattyinengland

Posts: 790
Joined: 23 November 2006

Use a threaded coupler and brass bushes anyway

You can cut the plastic adaptors in half nearly, with a reeeeaaaalllllyyyyy short bit of glued conduit in between complete with a bit of white mastic if you're fussy enough to hide the inevitably ragged cut line. I've had to do this before when desperate.

Manufactured item in plastic? Nope - no solution comes to mind.

If it's just that the lid won't go on because the trunking is taller than the box, instead of moving the box and fitting conduit between, then a bit of 5mm paxolin between the two may the answer?
 11 April 2013 01:08 PM
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mikejumper

Posts: 1824
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Originally posted by: tattyinengland
You can cut the plastic adaptors in half nearly, with a reeeeaaaalllllyyyyy short bit of glued conduit in between.............. q]
That's the only solution I'm aware of in this situation.
It's a bit fiddly trying to cut the adaptor square.
 11 April 2013 05:10 PM
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AncientMariner

Posts: 549
Joined: 14 December 2004

Just an idea, how about 21.5mm white pvc overflow fittings? Possibly be able to adapt a straight tank connector such as:

http://www.screwfix.com/p/stra...1-5mm-pack-of-5/11877

Cheers!

Clive

-------------------------
Clive S Carver GCGI IEng MIET
 11 April 2013 05:17 PM
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unshockable

Posts: 854
Joined: 18 May 2007

You could thread some plastic conduit and glue it into the coupler each end if you were really fussy! I might be happy enough to just glue the unthreaded protrusions.

Simon
 11 April 2013 06:11 PM
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stateit

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Joined: 15 April 2005

As unshockable:

But you don't need glue... A bit of conduit through the two holes, held in place with tie-wrap at each end.

This assumes the box is going to be screwed/fixed to the wall/whatever, as it won't be held tightly to the trunking.

-------------------------
S George
http://www.sg-electrical.com
 11 April 2013 06:25 PM
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OMS

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Come on chaps, good workmanship and all that - Use a plain PVC conduit sleeve with a PVC bell mouth bush either end from inside the trunking and inside the enclosure, glued into the sleeve

here

regards

OMS

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Failure is always an option
 11 April 2013 06:38 PM
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redtoblackblewtopieces

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Have used a 20mm adaptor upside down in a 25mm one with white silcon before now-thread at both ends :-)
Kevin

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Safety through a Standard
Compliance by Approved Documents
 11 April 2013 09:21 PM
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leckie

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Well of course OMS is right, as usual, but it is amazing that nobody manufactures a PVC threaded coupling! That would solve all the problems and no glue required, but that would be too easy
 11 April 2013 09:54 PM
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AJJewsbury

Posts: 11768
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Come on chaps, good workmanship and all that - Use a plain PVC conduit sleeve with a PVC bell mouth bush either end from inside the trunking and inside the enclosure, glued into the sleeve

Cheers OMS - I hadn't come across the bell mouth bushes in PVC before. I guess I could even use one in the plain end of a female adaptor (better than my original backstop idea of a female adaptor with spare threaded bush siliconed into the plain end!)

but it is amazing that nobody manufactures a PVC threaded coupling!

Exactly my thought - it seemed so obvious an omission I half thought I must have missing something fundamental. I'm sure they'd be great for coupling KO boxes together to made for consistent spacing too - there must be a market!

thanks all

- Andy.
 14 April 2013 07:20 PM
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perspicacious

Posts: 7267
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Some 20 mm TRS glands have the "compressing" nut threaded 20 mm so discard this part and use the plastic equivalent of a male brass bush to make up the OP's desires......

Regards

BOD
 14 April 2013 08:14 PM
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weirdbeard

Posts: 1652
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Originally posted by: perspicacious

Some 20 mm TRS glands have the "compressing" nut threaded 20 mm so discard this part and use the plastic equivalent of a male brass bush to make up the OP's desires......



Dismantling a fitting, adding other bits and discarding bits of it for use other than that intended by the manufacturer - wouldn't that be a departure?
 14 April 2013 08:49 PM
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davezawadi

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Are you emulating BOD wierdbeard?

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David
CEng etc, don't ask, its a result not a question!
 14 April 2013 08:54 PM
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perspicacious

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Probably easier to word on your EIC than the use of plumbing fittings

Also probably ranks alongside the number of installers that record their use of radiator earth clamps

Regards

BOD
 14 April 2013 08:58 PM
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weirdbeard

Posts: 1652
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Originally posted by: davezawadi

Are you emulating BOD wierdbeard?


Maybe



Originally posted by: perspicacious

Probably easier to word on your EIC than the use of plumbing fittings



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