I'm going to be running several 50 pair buried CAT5 cable drops for a new install and it just occurred to me - will I have problems punching down a 25 pair side to a 66M or 110 block. I've done it before, but never gave a thought if I'm loosing any data cable integrity.
CAT5 cabling specs call for less than 1/2 inch of pairs be untwisted when it connects into a jack or block and with as little as possible length of the twisted pairs coming out of the UTP sheath.
But what happens when you need to punch down a 25 pair cable? If you have your 25 pair cable sheath cut off at the bottom of the block, the still twisted white/blue pair running up the side of the block will have ten inches out side of the sheath.
Since you're not disrupting the twisting, it would appear it doesn't matter (within reason, or ten inches) if the pairs are outside of the sheath...as long as they are still twisted up to the point of getting untwisted at the punch down point.