JKT (3 conductors, originally) was used for telephone service that required a ground reference for party-line ringing.
I see a lot of this JKT cable in older buildings. Really thick gauge wire, like 19AWG or something. I was wondering, should the 3rd wire be left alone if connected to ground at the NI, or should it be disconnected if found? To clarify, is there any reason in today's "modern" telco system to leave the 3rd wire bonded to ground or disconnect it?
I see some of the LEC technicians still wire the yellow wire to ground, even if it is quad wire. Personally on quad, I remove the yellow wire from ground as it makes more of a mess, so I wrap it around the outside jacket (like the black wire) so it is out of the way and can be used a 2nd pair in the future.
