July 20 (Reuters) - TC Pipelines LP TCP.N
* TC Pipelines, LP increases 2017 second quarter cash distribution by six percent
* TC Pipelines LP - Directors of TC Pipelines GP, Inc., its general partner, declared partnership's Q2 2017 cash distribution of $1.00 per common unit
* TC Pipelines LP - Distribution represents a 6 percent increase from $0.94 per common unit paid in Q1 of 2017.