I believe as long as holes are drilled a minimum of 2" from the top and bottom of a spanning lumber and no hole exceeding more than 1/3 the width of the lumber you are fine...
Joist vs Load Bearing
I had to make a few holes in some ceiling joists. 1 two-inch hole per joist. Across 6 or 7 joists in roughly the same spot. I made sure that I was 2 inches above the ceiling drywall when I made the holes. I realize that the joists are weakened but did I just weaken them to a point of concern? 
There are 2 bedrooms above. The joists are 9 inches wide.
There are 2 bedrooms above. The joists are 9 inches wide.
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