2nd installation question of the day...

[ban-all-sheds]

Connecting 20mm steel conduit to galvanised back-boxes - preferences sought, and if you want to add reasons why, please do.

□ Female bush and locknut/lockring.

□ Male bush and coupler.

□ Other.

 

[holmslaw]

..

 

[RF Lighting]

I'd go with male bush and coupling.

It takes up less room in the box.

Having a female bush in the box could prevent an accessory from fitting back properly, if for example you were using a grid frame or similar.

 

[Space cat]

Why would you use a male bush and coupling if you can get a female bush? The other option would be to dispense with the bush altogether and put the end of the conduit straight into the hole with nuts inside and out.

 

[Space cat]

Why would you use a male bush and coupling if you can get a female bush?

It takes up less room in the box.

Good point!

 

[ban-all-sheds]

The other option would be to dispense with the bush altogether and put the end of the conduit straight into the hole with nuts inside and out.

Wouldn't that leave the cables at risk of chafing against the cut end of the conduit, unless you spent a lot of time dressing it?

 

[holmslaw]

..

 

[Space cat]

unless you spent a lot of time dressing it

That's something I would always do anyway. I hate leaving burrs on the ends of any kind of tubing, whether it's conduit or water pipe or even plastic drain. On the other hand, when time is money --

OK. I give up; you win!

 

[Spark123]

We tend to use top hats (AKA flanged couplings), lead washers and male bushes when connecting to metal clad accessories, I take it you are talking of flush back boxes? It should be possible however you may need deeper boxes.

 

[aptsys]

□ Female bush and locknut/lockring.

□ Male bush and coupler.

Haven't you got male/female mixed up in your descriptions bas? The locknut goes on a male coupling, bush goes on the female coupling.

 

[Spark123]

I don't think he has - female bush is one of these:

(I kept a straight face - honest!)
I think he means use the thread on the end of the conduit for both the locknut and bush, sandwiching the backbox metal between the two.
I have seen that method used before - had to do it myself not long back owing to not being able to buy 1,1/2" conduit fittings and that's all I had which would fit .

 

[aptsys]

Ah, I'm thinking of plastic conduit. doh!

 

[holmslaw]

..

 

[NotHimAgain]

What type of dies do use for cutting threads on plastic conduit.

Brand new ones that are very sharp it can done.

 

[holmslaw]

..