Bellcore used to be the place to be Bell Certified. Bellcore is the company that produces the Blue Book of Construction practices. If you don't have access to a Blue Book, let me know & I can locate one.
You don't always get what you expect, but you know what you got when you inspect. Happiness comes from within, some poor souls are just without.
This is CABL.com posting #27982. Tiny Link: cabl.co/mhru