If you don't remove it, you will be hy-potting buss and all simultaneously. Not a big problem, but you won't know if the problem is cable or buss.
Try an ohm-meter first, it will tell you more about how far away your problem is, but if the ohms are high phase to ground, your still stuck trying to locate. You may need to find a "thumper" if it is underground.
The hy-pot will tell you if you have a bad termination, if the cable has been in service awhile and just started tripping out you will likely see track marks near the term if that is the problem.
