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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Bending 20mm Round Electrical Conduit
I've seen installations where this type of conduit has been bent at 90
degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? It must be possible but I need to know how ? TIA Andy. |
#2
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Bending 20mm Round Electrical Conduit
wrote in message ups.com... I've seen installations where this type of conduit has been bent at 90 degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? It must be possible but I need to know how ? TIA Andy. A conventional pipe bender can be used on black metal or galvanised conduit - (you need the correct sized former though). Plastic conduit comes in two 'weights' thick and thin walled. The thick walled variety can be bent with a pipe bender, but the thin walled variety needs an internal spring. With either weight of plastic conduit you get far more 'spring back' than with metal conduit, and it varies quite a bit from make to make, so you have to 'bend further' than you would for metal. Be aware that the thin walled type will often show the spring pattern on the outside after bending. AWEM |
#3
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Bending 20mm Round Electrical Conduit
In article . com,
wrote: I've seen installations where this type of conduit has been bent at 90 degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? It must be possible but I need to know how ? What sort of conduit - steel or plastic? -- *When you've seen one shopping centre you've seen a mall* Dave Plowman London SW To e-mail, change noise into sound. |
#4
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Bending 20mm Round Electrical Conduit
In article ,
Andrew Mawson wrote: A conventional pipe bender can be used on black metal or galvanised conduit - (you need the correct sized former though). I used to have a conduit bender (Hilmore) and it's rather different from a copper pipe one. Unfortunately none of the bits from the same maker could be swapped to have just one for both. The conduit one didn't use a top former but a shaped roller. And although at first glance the 'frame' looked the same it wasn't in practice. Could be another maker was more sensible, though. -- *The early bird gets the worm, but the second mouse gets the cheese * Dave Plowman London SW To e-mail, change noise into sound. |
#5
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Bending 20mm Round Electrical Conduit
"Dave Plowman (News)" wrote in message ... In article , Andrew Mawson wrote: A conventional pipe bender can be used on black metal or galvanised conduit - (you need the correct sized former though). I used to have a conduit bender (Hilmore) and it's rather different from a copper pipe one. Unfortunately none of the bits from the same maker could be swapped to have just one for both. The conduit one didn't use a top former but a shaped roller. And although at first glance the 'frame' looked the same it wasn't in practice. Could be another maker was more sensible, though. -- *The early bird gets the worm, but the second mouse gets the cheese * Dave Plowman London SW I have a very comprehensive Record pipe bender with all the metric and Imperial formers for both copper and gas barrel, however the formers from my old Hilmor bender fit it exactly. Usually for steel pipe you have the female former to bend round, and the 'puller' has a grooved wheel to run on the outside of the tube, however with the old style of steel conduit that was bent from plate and not electically welded along the join not only did you have to use a 'U' guide bar under the puller, but also you had to be very careful where the pipe seem was relative to the bend direction or it opened up. AWEM |
#6
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Bending 20mm Round Electrical Conduit
wrote in message ups.com... I've seen installations where this type of conduit has been bent at 90 degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? Thick wall PVC conduit can be bent using a hot air gun. Don't get it too close, particularly with white, which can discolour. Play the gun along the whole length of the bit you want to bend, turning the conduit to get the heat even. When it starts to droop, it can be curved to shape and left to cool on a hard surface. You may need to press gently on the sides to get it round. If it kinks, you are trying to get too small a radius and should use a solvent weld inspection bend or elbow instead. I've used this for many difficult locations, including a double curve bringing a pair of conduits down one face of a 4" square post and turning them so that one feeds a socket on each of the two adjacent faces. Colin Bignell |
#7
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Bending 20mm Round Electrical Conduit
In article ,
"nightjar" nightjar@insert my surname here.uk.com writes: Thick wall PVC conduit can be bent using a hot air gun. Don't get it too close, particularly with white, which can discolour. Play the gun along the whole length of the bit you want to bend, turning the conduit to get the heat even. When it starts to droop, it can be curved to shape and left to cool on a hard surface. You may need to press gently on the sides to get it round. If it kinks, you are trying to get too small a radius and should use a solvent weld inspection bend or elbow instead. I've used this for many You can buy preformed swept bends too. difficult locations, including a double curve bringing a pair of conduits down one face of a 4" square post and turning them so that one feeds a socket on each of the two adjacent faces. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#8
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Bending 20mm Round Electrical Conduit
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#9
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Bending 20mm Round Electrical Conduit
On Thu, 30 Aug 2007 21:50:51 -0700, "cerberus"
mused: "Lurch" wrote in message .. . On Thu, 30 Aug 2007 05:18:21 -0700, mused: I've seen installations where this type of conduit has been bent at 90 degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? It must be possible but I need to know how ? snip Rubbing it with your hand in a rude manner warms it up enough. Regards, Stuart. Ah, the 'good old days' when an apprenticeship was an apprenticeship! :-)) Heh, 1997 was when I finished mine. -- Regards, Stuart. |
#10
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Bending 20mm Round Electrical Conduit
"Lurch" wrote in message ... On Thu, 30 Aug 2007 05:18:21 -0700, mused: I've seen installations where this type of conduit has been bent at 90 degree's and at various angles. My question is how is this done ? Do you have to gently warm the conduit to do this ? Must the conduit be supported on the inside so that it doesn't collapse ? It must be possible but I need to know how ? snip Rubbing it with your hand in a rude manner warms it up enough. Regards, Stuart. Ah, the 'good old days' when an apprenticeship was an apprenticeship! :-)) Don. |
#11
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Bending 20mm Round Electrical Conduit
Rubbing it with your hand in a rude manner warms it up enough.
Regards, Stuart. Ah, the 'good old days' when an apprenticeship was an apprenticeship! :-)) Don. Finally got round to having a go at bending my plastic conduit. Bought myself a bending spring as below: http://www.drapertools.co.uk/Pages/Pagesource/p286.pdf Part no was 71359. Although the blurb stated it was for bending conduit with an *internal* diameter of 20mm it worked fine for my conduit bought from Wickes/B&Q which had an outer diameter of 20mm. Sure enough heating with a heat gun was too much and the rude rubbing method worked a treat! Managed to bend at 90 degrees as well as adding kinks etc to get round obstacles. Thanks to everyone for their help with this. |
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