As the internet gets ever more frustrating to use, mostly coming up with superficial rubbish, it’s an absolute delight to find real, proper, helpful information presented in such a clear and concise manner. I have never seen a more thorough and engaging presentation. I’m watching all your videos - no need to go anywhere else!. Thanks.

I’m learning about steel conduit to be able to run data cabling for CCTV on industrial sites and I already know before watching this video from John’s past videos this is going to be extremely useful. Thanks in advance John 👌

62k subscribers, Holly smoke... Well done and of course we'll deserved. My favourite channel.

No. Stop. I missed the first 30 seconds of the intro because I was laughing so hard at the cute minions t-shirt. Love your videos and love The dry humour :-)

John's straight face and his hilarious shirts always make me giggle like a school girl.

Hi John, This takes me back to my apprenticeship when the conduit was 1 and 3/4 inch then they changed to 25 and 20mm. I remember bending the conduit using me knee or a length of timber with a hole drilled in it. Then the boss got a bending machine...good times. Copper piro was also a good product but too expensive now. Thanks for you videos. Cheers Dave.

Don't forget to mention that with legacy conduit installations the boxes have 2BA threads, which is a larger thread diameter than M4.

Great video, this brings back memories of threading running couplers on 25mm pipe as a first year apprentice-seeing a yellow Hilmor bending machines still causes flashbacks..

I find using a vacuum cleaner with some flex conduit taped in the end can pull a string through to pull cable. Also can use if drilling through a box want to vacuum the mess as you do.

I'm seeing a lot of comments on US conduit properties which are pretty inaccurate. Here are some common specs for US conduit types: 3/4-inch EMT (21mm inside diameter) Nominal wall thickness 0.049 in., 1.25mm (tubing is not allowed to be threaded) 3/4-inch rigid conduit (21mm inside diameter) Nominal wall thickness 0.107 in., 2.72mm (threaded with tapered threads) Neither of these are bendable with bare hands unless you're really, really tough. For EMT trade sizes up to 1-inch and rigid trade sizes up to 3/4-inch, we generally use a hand bender. Above these sizes there are hand-powered benders, electric benders and hydraulic benders. US practice would be to avoid the combination of bushing, coupling (coupler) and threaded conduit to minimize the number of joints when using the conduit as a ground fault path. We would typically use two lock nuts on boxes with knockouts, one inside, one outside the box to attach the conduit to the box, and a plastic or malleable iron bushing inside the box to cover the end of the conduit and prevent damage to wires. Cast boxes will be similar with factory threaded (tapered) entries. The tapers on the male and female threads form a pretty liquid--tight connection. Set screw connected conduit has a very long tradition, and if installed properly can maintain ground continuity for a very long time especially when steel connectors and couplings are used (versus the zinc fittings which were very popular back in the 70s and 80s). That being said, it has become common practice to pull a separate ground conductor through conduit and not to rely wholly on the piping system for ground faults. This doesn't eliminate best installation practices required for installing conduit with set screw connectors and upon installation the conduit system must perform properly as a grounding conductor. In general, metallic conduit is much more common in the US and Canada than in Europe and the installation of conduit here requires a more advanced level of craftsmanship than outside the US and Canada. Guys who do it often have really turned it into an art form.

Exalent vid as per with all John's vids.. & top tee-shirt very informative look forward to next part thank you

Great, comprehensive intro to the subject. Thanks!

12.26 I’m impressed. This great tool .. and yet I’ve seen John tighten screws with the end of a pair of pliers. 😐 Love you, John!

Great video. What would be great gangs to install on brick wall. Looking for something that won’t go into plaster. I didn’t know what would look nice but be suitable for project. Thanks

Any chance please JW you can do a video about how to measure to bends etc and how to finding bending point on conduit bending former please

Are conduit boxes fixed to the wall? There doesn't appear to be any fixing points?

This might be answered in a future video but how often is the earth wire attached to the conduit? After a certain distance? Every time the cable is broken out/terminated?

Excellent video, Dr. Nefario, thank you ;-)

Here in the United States we use 6/32 screws for switches and receptacles, and 8/32 screws for light fixtures. The screws have 32 threads per inch.

Loving that shirt John!! 😍

Thank you for excellent video.

john will you soon make a video about flexi conduit and the accesories involved in using / installing

I was glued to this vid from start to finish. Is thete a special tool for tightening the milled nuts like the one you used for the hexagonal ones? Thanks for sharing.

Thanks a very useful instruction.

Just about the only time we used a "slip ring" was when we needed ti join to conduits together that were both bent! Simply threading the length of the coupler and ring on one conduit, run the "slip ring" and coupler onto the conduit, offer the two conduits together and thread the coupler over the second conduit tightening the first conduit with the ring! If you needed a Box to be at the right angle to a tube when tight simply try it first and if the box is too far to make it , note the angle it is off and run the die back to the end plus the required angle! We also never used the conduit as an earth but ran a dedicated earth wire! This meant that 1. you did not have to have a lower resistance path because the conduit is steel and the wire copper and 2. When the conduit deteriorates you do have an effective earth path! .... Obviously we earthed the conduit at each light / socket / switch point ;0)

Female bushes are used on control panels used on machines in factories and so on.

Fantastic video!

this is probably equivalent to Intermediate Metal Conduit or Rigid metal conduit in the US.

Thanks for sharing.

Thanks John

John should be a college lecturer

will those bush wrenches do the locking nut/ring for swa glands too?

Golden 👍

Nice shrirt very informative. Thanks

Joseph Nicholas is that the same reason for coming back to metal CU because they are a 1000 years old?

Any reason for the brass screws?

Can you use the steel conduit outside into a light (side entry) using just a Bush and coupler? I don’t see how it’s ip rated against rain?

What is meant by class 1,2, 3 & 4 in steel CONDUIT (BS 4568) , Is this specification still in use?

Do people bury conduit in walls? I’ve only ever seen in factories/workshops and occasionally domestic outdoor wiring.

Re the rusty thread, surely this would hinder a good earth connection. Is it the done thing to clean the thread with wire wool or similar then coat the thread with a light grease? Great explanation thank you.

JW, as always, thanks for your videos, very helpful content. I wanted to ask, can the galvanized steel conduit be used externally? I ask because it does not look like the boxes will be waterproof when you screw a flat top on them? Thanks

Yeah, huge difference between EMT and rigid conduit. Interesting that British sizing is for the OD, not the ID. Trade sizes in the US specify the ID and, unlike US lumber, the actual ID is slightly larger than the nominal value. So-called 1/2" conduit has ID ~0.74" and 3/4" has ID ~0.95". Are the UK threads straight or tapered? The handles on that diestock are pretty small for the size.

Would be interested to see part 3…….

What's the advantages of metal conduit over SWA/Armoured cable?

I use wd40 spray or tapping spray when threading metal conduit. Bahco holesaws seem the best for drilling out the backs, it's handy to make a wooden block to secure them instead of drilling between your feet on the floor

Nothing like doing the first fix and then going back to pull the cables only to find the plasterer has filled your boxes full of muck and the plumber has gone through your conduit with a hole cutter....

Seriously cool stylin bro ;-)

Conduit 101

What about stainless steel I’ve put it in a school kitchen

6.24 wow! Are you sure you have enough of those screws?

i have threaded plenty of conduit for internal work galv conduit is a total waste of money black enamel was allot easier to thread but that was them good old days . but think 18 edition wiring regs are with us metal consumer units plastic conduit could collapse in a fire oh dear , the metal clad system is back . a swan neck bend was the practise piece for a beginer in con duit or two u shaped bends with running couplers i made a right mess of mine . john thank you for these videos you are a person with in depth knowledge . ? the iee used to have lecture nights held around the country to explain things in yours and my terms a bit like the christmas lectures on television i went to two very very good iet now what do these people offer if dont they should . thank you john

Are you, John, wearing your pyjama?! :D

Hi, where is it legally required in Uk and what installations is it just advisable? Appreciate the factual presentation in contrast to US self promotional vids.

Suggest more muted, plain, less gaudily-decorated wardrobe in future?

Wiring minions. Making more CNC stuff?

good video, my request pls add meterial names on next upload videose sir,

I'm surprised that these old slotted screws are still being used after all this time. >

What about hospital saddles

this is complicated work. you can't atach the boxes o the wall untill you finish all circuit. because you can't twist the box on the wall with a conduit atached to the wall. that's why they have the "nasty" way of connecting them.

Much more robust and less plasticy than our arrangements in the US...

OMG... EMT is so much easier to use!

It is important to use pipe dope on threads otherwise electricity will leak 😂

What about stainless steel conduit?

Wire whool

In the us they call steel conduit rigid conduit.

I am that moron

I think the closest thing we have here in Amerikkka would be called IMC which has a thinner wall thickness than rigid conduit.

I have sold conduit systems for over 2 decades and John’s information is quite interesting but makes a number of glaring mistakes in terms of his explanations of certain things, as for his comments on Conlok his knowledge of the product is frankly weak and extremely misinformed.

I wonder if JW ever laughs

I’m not having a go but I’m pretty sure your not a Sparks. I could pick it apart but I won’t.

never take any notice of anyone who spells wire wool,as whire wool

First

I'm assuming you are superstitious..

Don't use this metal conduit anymore. It was the standard 1,000 years ago before plastic was invented. Same goes for plumbing.