Hi, building industry start getting bitter and twisted if you go over 32mm, normally 25mm is fine, otherwise put a couple of 25mm in with a gap between.
Hi, oh, so just a couple of cables, a 25mm hole will start being stressed when your stuffing 10 or so cat6 cables not 6 or 7, cat5e cables are slightly smaller. RG6 and Cat6 are similar dia.
Cyril's advice sounds good to me as a structural engineer. Of course it all depends on the depth of the joist. Generally penetrations should be less than 1/4 of the depth of the beam. It must also be located at mid-height of the joist.
Thanks guys, the joists at normal 6" joists so 25mm is well under the 1/4 of the depth. I'll test on a scrap piece of wood to work out how small I can go to fit all the required cables through.
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