ᐅ Electric cable too small for multiple supply lines

Hello,

our shell construction is finished and we have a Doyma Basic R3. The electrician said we should install a 5x16mm² cable from the main connection pole (with main distribution box) into the house. Yesterday, the Doyma installation part for indoors arrived, including the internal seals, and it requires the cable to have a minimum diameter of 26mm (1 inch). However, my 5x16mm² cable only has a diameter of 24mm (0.94 inch). Is there a way to adapt something between the cable and the seal, or do we have to use a different cable? The worst case would be replacing the cable since the trench is already closed.

Thank you in advance for your help.

The correct approach is to use the appropriate adapters/inserts from Doyma, for example, a foldable onion insert. Silicone is more of a "quick fix." If anything, use PU (not foam). I wouldn’t make a big science out of it. Apply PU grease on the cable and once it passes through, seal it again from the front. You can find what you need at Sika.

But we are both talking about the seal, right?

Exactly. There are different inserts available from the manufacturer.
I’m not familiar with your insert. It is probably also foldable.
Simply seal the area where the cable passes through the gasket with polyurethane (PU) to compensate for the 2mm (0.08 inches).

Okay, thank you... the mounting is not foldable and will only be screwed on.

No problem if the cable is just being pulled through.
Pull it through and mark the spot with a permanent marker where the cable passes through the seal. Pull the cable back out and apply sealant to this spot. Now pull the cable through again. This way, you will have sealant on the outside and in the seal. Finally, apply sealant on the inside, filling the gap between the cable and the penetration.