PVC Conduit Question

[RDB85]

I’m looking to buy some PVC Conduit for some security lights rather than clip the cable. We don’t use it in work. But I know I need 20mm conduit but would I be okay using 20mm inspection elbows? I assume they just fit inside?

 

[Pete999]

I’m looking to buy some PVC Conduit for some security lights rather than clip the cable. We don’t use it in work. But I know I need 20mm conduit but would I be okay using 20mm inspection elbows? I assume they just fit inside?

No the tube fits inside the fittings and Don't forget to use the adhesive!!!!!

 

[RDB85]

No the tube fits inside the fittings and Don't forget to use the adhesive!!!!!

I’ve been given a length of 20mm PVC so I would need 25mm fittings.

 

[stitch]

No, you would use 20mm fittings such as these.

20mm Pvc Conduit & Fittings - White

 

[Mike Johnson]

Beat me to it, but only just.

 

[Pete999]

I’ve been given a length of 20mm PVC so I would need 25mm fittings.

No, 20mm fittings are designed, for 20mm conduit, you may need a bending spring as well as a tube cutter if you are doing a lot of tube work, although a Junior Hacksaw will do the job just as well, although a cutter makes a better job of cutting use Heavy duty tube it's easier to bend and work with. In my considerable experience. Light duty tube tends to kink when bending,

 

[RDB85]

No, you would use 20mm fittings such as these.

20mm Pvc Conduit & Fittings - White

Okay that’s what I’ve got. 20mm fixings, inspection bends and elbows. Looks like I will need some adhesive.

 

[westward10]

I would avoid manufactured bends and elbows they look terrible in any instance. Get a bending spring and use sets wherever possible and use BESA boxes as opposed to the fittings you suggest.

 

[Pete999]

Okay that’s what I’ve got. 20mm fixings, inspection bends and elbows. Looks like I will need some adhesive.

Yep and saddles, box lids and screws and if outside some waterproof gaskets,

 

[Mike Johnson]

The inspection bends do not allow a cable draw tape to push around the bend without taking off the face plate or perseverance, better to use a slow bend or as suggested above a bending spring to get a slow change of direction.

 

[Vortigern]

Yes and black conduit for outside. Plus if it's a long run, expansion coupler.

 

[westward10]

Steel saddles to comply with current standards.

 

[Pete999]

Yep and saddles, box lids and screws and if outside some waterproof gaskets,

What they said as well above, can't remember everything can I?

 

[Mike Johnson]

Twelve answers in 22mins is that a record?

 

[Pete999]

Twelve answers in 22mins is that a record?

Hope the poster is all clued up now good luck Matey.

 

[ipf]

Hope the poster is all clued up now good luck Matey.

With all this new info, so quickly, I wouldn't be surprised if he's GLUED up.

 

[Pete999]

With all this new info, so quickly, I wouldn't be surprised if he's GLUED up.

Hope he aint stuck up, hope it works out for him, despite the banter.

 

[MJPD29]

Okay that’s what I’ve got. 20mm fixings, inspection bends and elbows. Looks like I will need some adhesive.

Manufactured inspection elbows look terrible and amateur/DIY. Get a bending spring and make required bends. It's also cheaper in the long run.

 

[radiohead]

Yep and saddles, box lids and screws and if outside some waterproof gaskets,

Only thing I might add is that 'waterproof' gaskets don't waterproof. By all means fit them but when designing an external system always assume water will get in. Allow for drainage, by for example, fitting a terminal box at the lowest point with a small drainage hole. Do not enter lights and accessories from the top, come in from below or the side, and keep all joints out of conduit boxes.

 

[RDB85]

Manufactured inspection elbows look terrible and amateur/DIY. Get a bending spring and make required bends. It's also cheaper in the long run.

Never used a bending spring. I will order one and do all my straight cuts and see if I have any scrap left to practice with.

 

[Dustydazzler]

Never used a bending spring. I will order one and do all my straight cuts and see if I have any scrap left to practice with.

don’t forget to give the conduit a good hard rub before you try to bend it...

 

[telectrix]

what's wrong with inspection elbows? how else do you come through a wall and then 90 degrees (up/down/left/right)? do youm bent the tube and have it sticking 4" off the wall?

 

[westward10]

Back entry terminal box, manufactured bends look terrible.

 

[Pete999]

what's wrong with inspection elbows? how else do you come through a wall and then 90 degrees (up/down/left/right)? do youm bent the tube and have it sticking 4" off the wall?

Me, I use a back entry on an end box and shoot off from there, better than an Inspection elbow I reckon, but each to their own I guess.

 

[littlespark]

Careful with the springs. Get one from the same supplier as the pipe you are using. There can be discrepancies between the inside diameter of different manufacturers. so it it can either be too tight to push in, or too loose and cause wrinkles.

whoever said bending the pipe with a spring would be more economical.... it depends how good you are at bending.

I see nothing wrong with using manufactured bends for neatness. All uniform radii, all the same.

 

[Risteard]

I would avoid manufactured bends and elbows they look terrible in any instance.

Not to put too fine a point on it, but they are truly awful.

 

[RDB85]

I’ve ordered the pvc adhesive. The diameter is 20mm but the elbow and inspection bends and even the end boxes don’t fit inside the conduit. As I wanted to get it all measures and test fitted before using adhesive.

As the tubing doesn’t fit over them I assume you would make some cuts in the end to make the diameter smaller?

 

[ferg]

The tube fits inside the accessories???

 

[freddo]

???? The pipe goes INSIDE the port on the fittings, it should stay there on its own, no need to cut anything, it just pushes in.

 

[RDB85]

???? The pipe goes INSIDE the port on the fittings, it should stay there on its own, no need to cut anything, it just pushes in.

I know it should do this doesn’t it’s the same diameter. So it doesn’t push inside. Not sure if it’s the conduit or the fixings I’ve bought. The fixing are a brand make and the conduit was given to me.

I will get a photo to show you what I mean. I assumed that the fixings should fit inside, so I was a bit confused when they didn’t and thought do I need 25mm tubing.