I need to pass a bipolar electrical cable through a concrete beam (30cm high, 15 cm wide) (12x6 inches). The hole would need to be about 1cm (3/8").
Is it safe to drill through it? There is no wall below it and one of its columns is "upside down" (see sketch below).
Edit: I did some further research and found some regulations regarding holes and openings on reinforced concrete beams. There is no need of additional reinforcement if the following is observed:
- hole in the traction zone of the beam.
- diameter limited to 12cm or 1/3 of beam height
- distance from supports equal to 2 beam heights
So in my case I would have to have the hole around 60 cm from the column in the bottom portion of the beam, and the diameter is below the threshold (around 1-2 cm). Is that right??