Plaster the slit in the outer wall for the cable above the canopy

Good day,

about 3 years ago the electrical wiring in our house was renewed by a company.

Now it has come to our attention by chance that above the porch of the main entrance there is a slot which was not plastered.
Through this runs an electrical cable which supplies the lamp on the porch with power.

The slot cannot be seen from the ground, therefore it went unnoticed.

How likely is it that moisture has already entered the masonry through this slot and possibly caused damage there?

When filling the slot again, is there anything special to consider because of the cable?

Should the cable be fixed in any way?

Thank you very much for your support!

I wouldn't worry about moisture. Just seal it with some mortar or quick-setting cement and that's it.

What I like less is the cable.

This is probably an NYM cable and to my knowledge it is not UV resistant, so it should be protected from sunlight by a pipe or something else.

Thank you very much for the feedback!

I will insert the cable into a corrugated conduit (slotted) and secure it with cable ties (each heat- and UV-resistant).

I will then seal the hole with [Blitzzement].

If there is still paint available, you can of course also paint over the mortar with it.

I cannot say whether the corrugated hose is UV resistant.

From my experience with cable ties, they are apparently not weather resistant. At least the ones I have here break after a few years. However, there are probably better ones. Pay attention when buying.

Thank you for the feedback.

I have now sealed the slot with quick-setting cement. I unfortunately bought the corrugated tube with a slightly too small diameter – I will have to look into that again. It is heat-resistant, UV-resistant, and allows operating temperatures in the range of -40°C to 130°C.

The cable tie is UV-resistant and weather-resistant for 10 years.

Neither will probably last forever, but things should be fine for the next few years.

Do I need to worry about the cold? The cable is still more or less outdoors anyway.

Because of the temperature, one probably doesn't need to worry; it probably goes down to the double-digit minus range. You are right, something like that is not designed to last forever.