conduit work

[Engineer54]

Hardly surprising, currently they're only good for electrical work!

Never seen conduit used to carry water, or anything else come to that... lol!!!

 

[somersetsparks]

I haven't been on a project for donkey's years now that allowed ''inspection bends or T's of any description (apart from T conduit boxes) to be used in conduit installation. They can rip the cables insulation to shreds. Another thing to remember, every screwed fitting in a conduit run will add a potential snagging obstacle for draw lines and cables alike. They should always be kept to the bare minimum....

Saying that a conduit installation looks more professional with these pre-formed bends etc has to be the joke of the week. They look anything BUT professional!!!
They look what there are, ...a conduit system that's been installed by Amateur that hasn't got a clue about conduit work!!

Indeed, even on the prisons 'special permission' has to be gotten to use inspection elbows, Tee's and inspection bends I have personally have hardly ever used in fact only when wiring a conveyor as there was just no room for besa boxes.

 

[Engineer54]

Indeed, even on the prisons 'special permission' has to be gotten to use inspection elbows, Tee's and inspection bends I have personally have hardly ever used in fact only when wiring a conveyor as there was just no room for besa boxes.

Inspection elbows were/are the worst for shedding solid core singles insulation. Though, i expect the reason for not allowing them in HMPS hotels, is to stop inmates from gaining access to wiring, rather than anything else!! lol!!!

They were designed for just such situations that you describe above , ...for tight connections on machinery and the like, normally on entries to accessory boxes such as em stops etc...

 

[somersetsparks]

Inspection elbows were/are the worst for shedding solid core singles insulation. Though, i expect the reason for not allowing them in HMPS hotels, is to stop inmates from gaining access to wiring, rather than anything else!! lol!!!

They were designed for just such situations that you describe above , ...for tight connections on machinery and the like, normally on entries to accessory boxes such as em stops etc...

All screws must be replaced with security ones, the spec for which changes from job to job, pretty much every one they use though is included in the £1.99 toolstation set!

I personally hate inspection elbows, bends and tee's as they make for more awkward wiring even with stranded singles, however sometimes they are the only option.

 

[dpiers1980]

i got a load of scrap out of bin at college and had a good go at it first before doing a set we were going from consumer unit into garage unit i put a set at both ends and it looked mint i wont lie i got it right the second time but on those small bays they have at college nobody bothered they just used hospital saddles. But when asked why i did like that i said in the real world you would have it set into unit then into consumer unit and i wanted to learn i was right they were wrong. On a 90 bend i bent to what i thought was 90 then went past a little and put it against a plum wall and it looked good. There is a good book JTL installing Electrotechnical systems and equipment has a good section on it

 

[johnboy6083]

im pretty good with conduit, in fact all steelwork, but the one thing im not 100% on is bubble sets. I can do them, but doing them to fit in an exact place, without cutting the tube to measure is a pain. Its not something i have to do often, so i dont get to practice it. It still looks ok, but i can see its 5-10 mm one way or the other, not central.
Im the only spark on site most of the time, and the others sprks are worse than me anyway, so its not like i can ask for pointers. Ill wait till i see an old boy about at some point and get him to walk me through it, so i get it perfect

 

[cogsey133]

Conduit work is a skill...the old boy who taught me bent it using a piece of wood with a hole the size of the conduit drilled in it; then i had to copy what he showed me before i was allowed near a conduit bender! remember it becomes slightly different beast (regards your way of thinking and approach) when you have to put the conduit in the bender and bend it upwards instead of down.....lol Using the bender to take out over bend or put a bit extra into it or to straighten your bend is also a good skill to have.

 

[Bick]

What's the shrinkage values for 20 and 25mm conduit? anybody know? the vids and pages i've looked at mostly give imperial measurements for shrinkage.

 

[Bick]

Should've put for 30 degree and 45 degree angles .......I've worked it out to be 25mm/1cm rise for 30 degrees and 40mm/1cm rise for 45 degrees, someone let me know if that is accurate or not.....also trying to get my post count up to post a couple of pics that could be helpful.

 

[somersetsparks]

im pretty good with conduit, in fact all steelwork, but the one thing im not 100% on is bubble sets. I can do them, but doing them to fit in an exact place, without cutting the tube to measure is a pain. Its not something i have to do often, so i dont get to practice it. It still looks ok, but i can see its 5-10 mm one way or the other, not central.
Im the only spark on site most of the time, and the others sprks are worse than me anyway, so its not like i can ask for pointers. Ill wait till i see an old boy about at some point and get him to walk me through it, so i get it perfect

Bubble sets are difficult to me as well, I can get them reasonable, but only if I start with bubble and put any other bends in after and double bubble..... well lets say I have only managed it perfectly once! I work with an old boy who can do even double bubbles perfectly every time with just the measure between the tubes! However he's not much of a teacher and as with most conduit work a lot of it is experience and hard to teach

 

[cantabrian9]

WELL,i had to laugh about this bending bit,(no offence!) In the bending block days (a bit of wood with two holes 3/4 -.1 inch!!) NOW it is into the big time !! With a Hilmor mark your pipe as back of bend , when it is in the former put a small piece of pipe VERTICAL in the former (groove) so as it lines up with the mark,AND ,---thats it !! KEEP PRACTISING!!