How do you run cables in a dented conduit? This is a difficulty for many electricians who run wires and cables in the conduit of electrical installations. In this article, the World of Electrical shows how to run several cables in a dented conduit.
Only those who run cables in an electrical installation know how horrible it is when the conduit is empty and even so the cables do not run. There are two possible situations for this, the first is when the conduit is completely clogged, and if the clogging occurred because cement fell into the conduit, which ended up drying out. In this case, there is no way, you will have to break the wall to unblock.
However, if the conduit has only loose stone or cement, it can be removed using a vacuum cleaner together with the probe. In addition to these situations that we have mentioned, there is another problem that is very common in electrical installations that greatly disrupts the electrician’s life, which is when the conduit is dented. The weight of the cement or concrete can be greater than the conduit supports or when making a curve with the conduit it ends up being crushed.
How to run cables?
When passing conduits on the floor, ceiling, and wall we must be careful, because when we make a very closed angle it ends up crushing the conduit, so the space to pass the cable loses the circular shape, and this makes the passage of cables very difficult. Anyone who runs cables frequently knows that when he is passing the probe from a box on the wall to a box on the ceiling, he almost always grabs it when it reaches the curve, and the motif can be crumpled conduit at the point of the curve.
The big mallet for passing electrical cables in dented conduits is the way to place the cables in the probe. Most electricians, when going to pass more than one cable in the conduits, usually strip the ends of the cables and join the ends together and then mend with electrical tape on the probe already passed. This method of routing cables is not wrong, but it ends up forming a bundle of cables at the tip of the probe and can make it difficult for cables to pass through dented conduits.
The big problem is that if you use too much force to run the cables through the conduit, the wires can end up loosening from the probe or even break the probe. The trick to getting the cables through a crumpled conduit is to attach a cable to the probe, and the other cables to the cables themselves so that the splice is gradual instead of trapping the probe.
To do this, make a cut in the middle of the first cable that is attached to the probe, then pass the next wire through the cut made, thus repeating the same process with the other cables and then apply electrical tape. In this way, instead of having a point that thickens at once, it happens gradually. This way it is much easier to pass the cables because the wires are settling and passing through the narrowing of the conduit. In the end, you are less strong and less angry.
Other means of facilitating the passage of cables in dented conduits is by using lubricant, for example, neutral petroleum jelly or talc at the points where the splices of the cables in the probe were made. Many electricians make mistakes when washing neutral detergents, even butter on the cables. The detergent for the cables does not harm much, but for the conduits, the detergent can be corrosive.
In this video below the Mundo da Elétrica channel, we show how to use the vacuum cleaner to pass a probe through a clogged conduit.