As someone...
cowboy2006 said:
...who in a past life ran more wiring through outside walls than he cares to remember...two wraps of friction tape, extending approx. two-three inches beyond the walls face (both sides, in and out) is sufficient.... If you are drilling from the outside, tilt your drill and bit up a few degrees from the horizontal...from the inside, down a few degrees...silicone isn't really required...your bit should be approx. 3/32nds-1/8 in. larger (but no larger than that) than the wire's diameter. When drilling, beware the blowout opposite the side you are drilling from...don't force the bit...it's better for the bit and the wall.
About the friction tape: Whatever the wall's thickness, say 8in. you want to start your half-overlap wrap at a point on the wire that will be equidistant from both faces of the wall...wrap in one direction for 6-7 inches (roughly half the wall's thickness plus that two or so inches I mentioned earlier)...tightly, but without tearing the tape, reverse the wrap, continuing beyond the starting point for another 6-7 inches...again reverse the wrap and end where you started: in the middle. Squeeze the tape onto itself (it will be sticky and tar-y) and Voila! two layers of tape to protect the wire from abrasion, providing its own stop and the tapered, cigar-type wrap avoids stray tape edges, easing insertion.
There are sleeves that are designed for the purpose, but they may be problematic to come by for the general public...
jimHJJ(...wood, brick, block or poured, that's all you need...)
