Sorry I didn't read the threat just the original post, so forgive me if I'm repeating something someone already said, but:
You don't need any cable certifications or any of that ****, just watch some YouTube videos on creating Cat5-6 cables or whatever.
Cabling is for a cabling vendor, generally speaking. If you're company is smart they won't make their own cables and just buy them as store bought cables are much more reliable.
Sometimes you may run into a situation though where knowing how to make a cable can be very useful, so learn it, but don't worry about it.