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Joined: Aug 2001
Posts: 7,520
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How much is 16mm conduit used in the UK?.
We usually start at 20mm and work up from there.
20mm is the smallest size generally used for normal electrical work, then 25mm and upwards. The IEE and electrical industry in the U.K. changed to metric specifications about 1970.
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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Paul, I just wondered if 16mm was used over in the UK?. Like yourselves, we use 20mm and up!. ![[Linked Image]](https://www.electrical-contractor.net/ubb/wink.gif)
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Joined: Aug 2001
Posts: 7,520
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No, 20mm is the smallest, and also the size of knock-outs provided on fixture boxes. Heavy gauge steel conduit also starts in 20mm as the smallest size.
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Joined: May 2002
Posts: 382
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20mm was also the smallest size used in South Africa. I am not sure though whether the RSA white PVC was UV rated for outside use - I can't seem to find any old off-cuts right now.
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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Hutch, Both types we use here (grey and orange) are UV-stabilised. Although we had some Orange flexible conduit a few years back that just fell to pieces after a few months in the sunlight. ![[Linked Image]](https://www.electrical-contractor.net/ubb/frown.gif) But the plastics people must have got thier act together, because I've never seen anything like it since!. ![[Linked Image]](https://www.electrical-contractor.net/ubb/smile.gif) BTW, does anyone ever use Black HFT conduit?. [This message has been edited by Trumpy (edited 02-06-2004).]
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Joined: Jul 2002
Posts: 8,443 Likes: 3
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I was told there was a call-back to this job last week.
The handyman on site, decided to install a water pipe thru one of my Dek-tites.
Not only did his coupling leak, he never bothered to seal around the cut in my Dek-tite.
When I get a hold of......
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Joined: Sep 2003
Posts: 650
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The reason I ask this, is because, we gave up doing this a few years ago, apart from in Industrial installations.
In most cases, it's a lot easier to pull TPS through the conduits, before it's assembled, that's how I did this job.
Just means that you need a size larger than normal.
In the US this would not be permitted; under NEC 310.18(A) you must install the complete raceway between 'pull-points' and then pull the wires in. I'd always understood this to protect the conductors from getting damaged during the installation process, but I know the actual reasoning. I would be quite concerned about the welding solvent for non-metallic conduit softening the conductor insulation. -Jon
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Joined: Dec 2005
Posts: 141
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One summer here and conduit runs like that on a tin roof would be looking very sad. I guess that's not so much a problem in NZ
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Joined: Dec 2005
Posts: 141
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16mm conduit is available in Australia but you rarely see it used. With the limited application where you could use it for the only slight savings in cost it's not worth the trouble of carrying it around with all it's associated fittings.
For the same reason I often use 6mm² where 4mm² would be allowed.
You have to weigh up what's worth stocking so you can get by in a van rather than having to drive around in a pantech.
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Joined: Dec 2005
Posts: 141
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Both types we use here (grey and orange) are UV-stabilised. Is there a reason for that. Orange conduit in Australia is not UV-stabilised. If it is run where it's exposed to the sun it has to be painted.
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Posts: 57
Joined: August 2003
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