I have a 22mm bending spring intended for 22mm copper and it is a fairly loose fit.
I was going to heat the pipe with my hot air gun and bend it around something round or maybe hammer some nails into a bit of old plywood and use them as a 90 degree guide.
I am replacing the gas pipe that was used to run power from house to garage in 1976 with the correct stuff, so needs a 90 degree bend at each end to fit a metre wide path, before re-instating the path (dug up for other reasons).
Why aren't you using SWA cable? Is this round or rectangular conduit? Round can be bent after heating with hot water but will start collapsing if the bend is too tight and (I suspect) may trip the spring. Why not use the joints made for the purpose (or SWA)?
In message <rq30fo$106h$ snipped-for-privacy@gioia.aioe.org>, Andrew snipped-for-privacy@mybtinternet.com writes
Yes. I only heated the inside of the bend in stages. Applying force causes a kink to form. Allow that to cool before starting the next. Not hugely pretty. Electric paint stripper with slotted nozzle.
You can get a swept bend for the conduit which is easier to push cable through than the normal bends. I pushed 10mm2 T & E through when providing power to my garage. The only thing you may find is that the likes of Screwfix et al only stock the two types of inspection bends. I got mine from CEF.
Why not buy, borrow or hire the correct bending spring for 25mm pvc conduit? If the jobs worth doing it's worth doing right. Personally I'd bury a run of much larger flexible ducting and leave a draw string in the duct as well as the cable you are going to use.
I wanted an 18" or so radius and an easier push through for the draw wire. Inspection bends are fine if you have access and the cable is happy at that radius.
when walking to the Post Office early I saw some people wrestling with 50mm flexible conduit near someone's gateway. On the way back I saw it was for an electrically operated gate.
The cable is that 'tuf' variety, not SWA so needs a conduit.
Believe it or not the incoming SEEboard cable is also inside a bit of gas pipe !!. It comes in under the storm porch, up through the slab in the front corner of the house under the door frame, inside some gas pipe, and then runs along the top of the slab for about 3 feet then up the party wall and into the metal wylex meter/fuse box.
Meanwhile there is an empty 38 mm black conduit under the path between house and garage, parallel to the actual 3/4 iron gas pipe which is inside a length of 4 inch salt glazed drainage pipe that was wacked inside the garage wall and outer leaf of house. Exactly where this 38mm black conduit goes is a mystery. It starts inside the garage about a foot down from the top of the concrete floor (garage dpc is 3.5 brick courses higher than the house dpc).
I suspect it terminates under where the Wylex meter/fuse box is, but without digging through the house slab I can't think of a way of finding out. An electricians fibreglass thingy would tell me how long it is but not where it ends laterally.
Its plastic conduit :-). I wasn't aware that swept bends were available for 25mm conduit. This is DIY, so bending with a bending spring (or filling with sand) is what we do, surely.
Dunno, the one linked was the type I used it had plain ends with a slight notch that stopped the conduit from slipping in more than about 20 mm. What I did note was as the cable was pushed through from one end you could feel it catch a bit on the end of the other conduit. The heavy duty ones seem to have the equivalent of a straight coupler on the ends thus presenting a smoother transition from straight to bend.
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