Picture of the week!™

[ban-all-sheds]

Which standard? Can't run the video on my phone.

I've always found I can't make phone calls (not counting dial-up modem connections) using computers.

 

[ban-all-sheds]

Can you rely on those minute grub screws to give good continuity when using the conduit as a cpc?

The adverts used to say you could, but I wouldn't dare. Not that I'd ever use this rubbish!

Even if the conduit is not used as the actual earth, would I trust the grub screws to earth the conduit?

The conduit must be reliably earthed as it is an ECP and from what I've seen of it I'd be very doubtful if this was the case.

Do you all have the same concern about trusting the small screws in various accessories?

Bear in mind that the continuity of the conduit is not through the screws, it is through the much larger surface contact area formed when the screw pushes the conduit and fittings together. Also it's all steel, so far less worry about how tight it can be done up before the thread gives way, unlike brass.

 

[securespark]

Chubby.

Smelly.

 

[securespark]

Do you all have the same concern about trusting the small screws in various accessories?

Bear in mind that the continuity of the conduit is not through the screws, it is through the much larger surface contact area formed when the screw pushes the conduit and fittings together. Also it's all steel, so far less worry about how tight it can be done up before the thread gives way, unlike brass.

I am concerned. The point you made about the contact area being formed when the screw pushes the conduit and fittings together is my very concern.

If that contact area was poor or the torque not great enough, continuity may not be satisfactory.

I have seen grub screws fail, usually due to stripped or crossed threads, even in all-steel constructions.

Far better to have beefier grub screws and more of them, maybe two per joint.

But that increases installation time.

In any case, as someone pointed out, the system cannot be water tight.

It would be very interesting indeed to test this system after a few years in service with the old fashioned high current conduit tester.

 

[stillp]

Which standard? Can't run the video on my phone.

I've always found I can't make phone calls (not counting dial-up modem connections) using computers.

Or take photos, scan barcodes, etc.
Which standard?

 

[john4703]

Anybody know what the standard referred to in the video is for?

Which standard? Can't run the video on my phone.

BS EN 61386 part 21 2004 is what was said in the video.
It was a bit unfair that the guy using threaded conduit was on his own while there were two men fitting the new system. The guy using threaded conduit also seemed to have blunt dies and no lubricant.

 

[seasickstevie]

... as someone pointed out, the system cannot be water tight.

As this thread began life with MICC in a switch room, and has digressed to talk about conduit, I'm not sure what being water tight has got to do with the price of fish.

I can think of many situations where damp would not even be an issue, and this stuff would be far better than plastic. A lot more robust, and a lot cheaper to install that traditional steel conduit.

 

[seasickstevie]

It was a bit unfair that the guy using threaded conduit was on his own while there were two men fitting the new system.

If I'm not mistaken ... and I can't be bothered watching it again ... when the 'threaded' guy started fixing it to the wall, he had an assistant also.

The difference being the grub-screw crew didn't need to go through the 'thread cutting' stage of the process. (Which is essentially a 'one-pair-of-hands' operation.)

 

[flameport]

Remarkable that concealing junction boxes with screws under floorboards because they might work loose over time is prohibited, yet this system with every joint 'secured' with a single tiny grub screw is acceptable?

 

[stillp]

From the BSI Shop:
BS EN 61386-21:2004+A11:2010
Conduit systems for cable management. Particular requirements. Rigid conduit systems

 

[sparkwright]

... as someone pointed out, the system cannot be water tight.

As this thread began life with MICC in a switch room, and has digressed to talk about conduit, I'm not sure what being water tight has got to do with the price of fish.

I can think of many situations where damp would not even be an issue, and this stuff would be far better than plastic. A lot more robust, and a lot cheaper to install that traditional steel conduit.

I pointed out the conduit system couldn't be watertight.

Being watertight has nothing to do with 'the price of fish', as you put it, but has everything to do with conduit being installed outdoors, as often conduit needs to be outside.

 

[stillp]

Is 'proper' threaded conduit watertight?

 

[sparkwright]

Is 'proper' threaded conduit watertight?

It must be, there's enough of it used outside commercial and industrial buildings.

And a CW armoured gland gets used outside, and uses the same thread.

 

[333rocky333]

There not much different to the knockon type that came out years ago

Untitled

• 333rocky333
• 13 Apr 2008
• 3

knock on coupler 20mm 2

Untitled

• 333rocky333
• 13 Apr 2008
• 2

knock on coupler 20mm 3

We had proper die sets years ago on mathew hall sites , not them toy town things in the video

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• 333rocky333
• 5 Feb 2009
• 2

 

[ban-all-sheds]

If that contact area was poor or the torque not great enough, continuity may not be satisfactory.

What's the contact area with traditionally threaded conduit?