How to cast electrical boxes in the wall?

[spaxx]

You nail it in the mold, yes, that's what's needed, and then when it's cast, you remove the lid and twist off the nail in the box

Is there anything that prevents the box from rotating? Well, the hose/pipe is also fixed, so I assume everything holds together.

 

[Hojte]

Is there anything that prevents the box from twisting? Of course, the hose/pipe is also attached, so I assume everything holds together.

If you don't nail it down properly with the nail or happen to set it a bit crooked, concrete can come between the box and the mold, but it's easy to chip away since it forms such a thin layer.

Then it might be that if you nail it onto the mold you lift into place (you have one side against which you reinforce and the other side you set in place last), there's a risk you might hit a reinforcing bar that nudges the box or crushes the box, but then you really have to apply force and force the mold into place for that to happen.

 

[spaxx]

If it's not nailed in properly with the nail or if it's set a bit crooked, concrete can get between the box and the mold, but it's easy to knock off since it becomes such a thin layer.

Then it might be that if you nail on the form you lift into place (you have one side where you reinforce against and one side you place last), there is a risk that you might hit a piece of rebar that nudges the box or crushes the box, but then you'd really have to apply force and force the form into place for that to happen

When you remove the casting form, do you just pull it away and the box cover follows and stays in the form?

 

[Hojte]

When you need to remove the mold, do you just pull it away and the 'doslock' comes along and stays in the mold?

Pull away the mold. The 'doslock' usually stays, but some of the nails may remain in the mold.