Lay electrical wiring yourself?

Hello everyone,

In the course of my house building research; "Which and how much electrical work is needed in a house," I came across Ewl-Instakit. The business concept here foresees that the electrical work is carried out by the builder and only parts are done by professionals or the system is inspected afterwards by a master electrician. The inspection of the electrical system is a mandatory requirement for subsequent insurance coverage. A possible concept for our wall construction includes an installation level between the exterior wall insulation and drywall, as well as interior walls in timber frame construction.

Especially because of the installation level, it should actually be quite easy to lay the necessary cables into the future rooms and distribute them in the drywall there. Therefore, we are currently considering whether the option "we pull the cables and then have them 'connected' and inspected" could represent a possible cost-saving measure. Besides EWL, there are certainly other electrical companies that are open to accompanying installation (when buying the components from them).

a) Are there any recent experiences with EWL here?
b) Has anyone ever done more in self-performance with a local electrical company than just chasing cable ducts?
c) What is the general opinion here in the forum about this approach? Are there any experiences about how much effort is involved in pulling cables in a buried installation for a 160 sqm house?

I look forward to the discussion.

You have to discuss this very thoroughly with the master company. What you do and what they do. Because in the end, the system will have to be accepted and put into operation.

But yes, it is doable.

In my house, I did everything related to KNX myself. Almost everything that concerns the usual flush-mounted installation was done by the master company. Thus, both were satisfied with the scope of the work and also with the financial aspect.

However, if you want to save almost everything and practically only have the system accepted and connected at the end, you will have great difficulty finding a partner who will do that.

Now I have to admit that I am ignorant. What do KNX and UP stand for?

Yes, coordination is the be-all and end-all, that’s why I would also find local support good. But before I start looking for that, I have to be clear whether I can manage it time-wise. After all, there are trades involved afterwards that cannot continue beforehand.

KNX is the leading standard for building automation. UP stands for flush-mounted.

The time required should not be underestimated. In addition, you need the planning services. Because the electrician ultimately needs to know where to connect what. So without any prior knowledge, it is rather difficult or a naive calculation. That is why most people do no more than chasing grooves and drilling boxes as their own contribution.

Hello, we found an electrical specialist company that was even glad that we are pulling the cables ourselves (electrical, network, etc.). Otherwise, they would not have accepted the contract because currently they lack the personnel for it. We of course clarified this in time !! (scope of work and material delivery) We will pull the cables and connect the sockets and network sockets (these completely) ourselves. The professional company will of course do the connection of power at the main and sub-distribution. They will also inspect the installation (electrical). This can definitely save money, how much?? Certainly quite a bit, above all you know where and how the cables are laid (label properly!!) and you can lay them neatly, which some companies do not do (cost/time).

KNX is the leading standard for building automation. UP stands for flush-mounted.

The time required should not be underestimated. Besides, you need the planning effort. Because the electrician must ultimately know what needs to be connected where. So without any prior knowledge, it’s rather difficult or a naive calculation. That’s why most people don’t do more than chipping slots and drilling boxes as their own work.

Of course, the whole thing only makes sense if it really saves a sum and I am also sure afterward that an acceptance inspection will be carried out.

My consideration with my knowledge about electrical wiring (to be seen only as a consideration…) a) I first need at least one "supply line" (3x1.5) per room, which is usually protected by a 16 A fuse. b) At 16A I can connect about 12 sockets (16A * 230 V ~ 3600 watts and an approximate power consumption of 300W per socket) on one line. c) The further distribution is then simply looped through from socket to socket or connected via terminal blocks. d) For consumers with higher power consumption (washing machine, dryer, dishwasher, and oven) a separate line including fuse is used. e) not to forget the three-phase line for the stove.

f) Light and satellite have not been considered so far…

If all these considerations are correct and I wanted to lay the network myself anyway, the effort for an additional cable from the technical room to the respective room should be associated with manageable extra effort, or did I overlook something?