So, riddle me this:  What happens when the drop braid and drop center conductor come in direct contact with one another?  Similarly, the same with hard-line's center conductor and aluminum sheath?  How about this scenario with 60-87VDC running on it?
Sounds like a closed or shorted circuit without termination that could emit egress or allow ingress.
 
    
        Zoots Alures - 
Minds are like parachutes.  They don't work if they ain't open {Fz}